Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
|---|
| arabidopsis myrosinases tgg1 and tgg2 have redundant function in glucosinolate breakdown and insect defense. | in arabidopsis and other brassicaceae, the enzyme myrosinase (beta-thioglucoside glucohydrolase, tgg) degrades glucosinolates to produce toxins that deter herbivory. a broadly applicable selection for meiotic recombination between tightly linked t-dna insertions was developed to generate arabidopsis tgg1tgg2 double mutants and study myrosinase function. glucosinolate breakdown in crushed leaves of tgg1 or tgg2 single mutants was comparable to that of wild-type, indicating redundant enzyme functi ... | 2006 | 16640593 |
| application of scanning microscopy in the study of virus transmission of aphids. | the scanning electron microscope was used in conjunction with the transmission electron microscope to study stylet morphology and the role of stylets of the green peach aphid in plant virus transmission. the morphology of the stylets generally agreed with earlier descriptions of these parts obtained with the transmission electron microscopy. a considerable variation seemed to exist in the extent and regularity of ridges observed in different individuals, especially among apterous adults and nymp ... | 1968 | 16789086 |
| aphid alarm pheromone produced by transgenic plants affects aphid and parasitoid behavior. | the alarm pheromone for many species of aphids, which causes dispersion in response to attack by predators or parasitoids, consists of the sesquiterpene (e)-beta-farnesene (ebetaf). we used high levels of expression in arabidopsis thaliana plants of an ebetaf synthase gene cloned from mentha x piperita to cause emission of pure ebetaf. these plants elicited potent effects on behavior of the aphid myzus persicae (alarm and repellent responses) and its parasitoid diaeretiella rapae (an arrestant r ... | 2006 | 16798877 |
| incidence of thrips and tomato spotted wilt tospovirus in fluecured tobacco protected from early season insect pest infestations. | the relative impacts of early season thrips exclusion (cages) and thrips suppression (pesticides) on tomato spotted wilt (family bunyaviridae, genus tospovirus, tsw) tospovirus infection in flue-cured tobacco, nicotiana tobaccum l., were examined in field trials in 2001-2004. there were fewer tsw symptomatic plants when plants were covered by exclusion cages for 6 wk than when they were uncaged or caged for 2 or 4 wk after transplanting. plant height, leaves per plant, and total leaf weight per ... | 2006 | 16813310 |
| operating characteristics of full count and binomial sampling plans for green peach aphid (hemiptera: aphididae) in potato. | counts of green peach aphid, myzus persicae (sulzer) (hemiptera: aphididae), in potato, solanum tuberosum l., fields were used to evaluate the performance of the sampling plan from a pest management company. the counts were further used to develop a binomial sampling method, and both full count and binomial plans were evaluated using operating characteristic curves. taylor's power law provided a good fit of the data (r2 = 0.95), with the relationship between the variance (s2) and mean (m) as ln( ... | 2006 | 16813341 |
| analysis of sucrose esters--insecticides from the surface of tobacco plant leaves. | sucrose esters from the surface of leaves of nicotiana tabacum l. have been shown to possess interesting biological activities. we developed a simple and effective method for their analysis using hptlc silica gel plates, n-hexane-ethyl acetate (1:3, v/v) as developing solvent and aniline-diphenylamine as a detection reagent. off-line tlc-ms was also used for the detection and identification of the compounds. solutions containing sucrose esters upon alkaline hydrolysis give sucrose, which is used ... | 2006 | 16820155 |
| comparative spatial spread overtime of zucchini yellow mosaic virus (zymv) and watermelon mosaic virus (wmv) in fields of transgenic squash expressing the coat protein genes of zymv and wmv, and in fields of nontransgenic squash. | the spatial and temporal patterns of aphid-vectored spread of zucchini yellow mosaic virus (zymv) and watermelon mosaic virus (wmv) were monitored over two consecutive years in plantings of nontransgenic and transgenic squash zw-20h (commercial cv. freedom ii) and zw-20b, both expressing the coat protein genes of zymv and wmv. all test plants were surrounded by nontransgenic plants that were mechanically inoculated with zymv or wmv, and served as primary virus source. across all trials, none of ... | 2006 | 16838196 |
| detoxication of pyrethroid insecticides by recombinant carboxylesterase from peach-potato aphid (myzus persicae). | 2006 | 16855895 | |
| phloem alkaloid tolerance allows feeding on resistant lupinus angustifolius by the aphid myzus persicae. | we examined the hypothesis that the polyphagous green peach aphid (myzus persicae) shows clone-specific adaptation to the narrow-leafed lupin (lupinus angustifolius) containing toxic quinolizidine alkaloids. we compared the performance of a lupin-feeding clone of m. persicae from western australia to that of nine clones of the same species collected from eastern australian locations, where narrow-leafed lupins rarely occur. mean relative growth rate (mrgr) and colonization ability varied among t ... | 2006 | 16906361 |
| analysis of genetic bottlenecks during horizontal transmission of cucumber mosaic virus. | genetic bottlenecks may occur in virus populations when only a few individuals are transferred horizontally from one host to another, or when a viral population moves systemically from the infection site. genetic bottlenecks during the systemic movement of an rna plant virus population were reported previously (h. li and m. j. roossinck, j. virol. 78:10582-10587, 2004). in this study we mechanically inoculated an artificial population consisting of 12 restriction enzyme marker mutants of cucumbe ... | 2006 | 16912285 |
| differential aphicidal effects of chitinase inhibitors on the polyphagous homopteran myzus persicae (sulzer). | four chitinase inhibitors, cyclo-(proline-tyrosine), cyclo-(histidine-proline), allosamidin and psammaplin a, were selected for in vitro feeding experiments with the peach-potato aphid, myzus persicae (sulzer), under controlled photoperiod and temperature conditions. artificial diets were used to provide chitinase inhibitors at 10, 50 and 100 microg ml(-1) to m. persicae. except for cyclo-(proline-tyrosine), which did not modify aphid demographic parameters, chitinase inhibitors induced differen ... | 2006 | 16953493 |
| cytochrome c oxidase mrna as an internal control for detection of potato virus y and potato leafroll virus from single aphids by a co-amplification rt-pcr assay. | using cytochrome c oxidase subunit 1 (cox1) mrna as the internal control, a triplex reverse transcription-polymerase chain reaction (rt-pcr) for detection of potato virus y (pvy) and potato leafroll virus (plrv) with co-amplification of cox1 from single specimens of various aphid species has been developed. partial length cdna of cox1 from green peach aphid, myzus persicae (sulzer), potato aphid, macrosiphum euphorbiae (thomas), buckthorn aphid, aphis nasturtii (kaltenbach), and pea aphid, acyrt ... | 2006 | 17010449 |
| [comparative susceptibility of myzus persicae to 16 strains of metarhizium spp. from different host insects and geographic regions]. | the fungal biocontrol agents metarhizium species and varieties have been widely applied for insect control but their targets rarely aim at sucking-type homopteran insects such as aphids. to search for fungal candidates against aphids, 16 strains of four varieties of two metarhizium species, most of which originally infected foliage insect pests in asia, africa and america, were bioassayed to compare their virulence to myzus persicae apterae. with each strain, each of three conidial suspensions w ... | 2006 | 17037063 |
| [uv-induced dna mutation of peach aphid]. | by using pcr technique and microsatellite marks, this paper studied the dna polymorphism of peach aphid (myzus persicae) under uv-radiation. the fragments of three primers were amplified, and the gene diversity and the rate of loci polymorphisms of their genomic dna, which could reflect the damage degree of dna after uv-radiation, were measured. the results revealed that after treated with different radiation intensity (15, 30, 45 w) and duration (2, 4, 6 h) , the uv-induced dna mutations were g ... | 2006 | 17044500 |
| a microarray approach identifies ant, os-d and takeout-like genes as differentially regulated in alate and apterous morphs of the green peach aphid myzus persicae (sulzer). | aphids exhibit a complex life cycle in which their phenotypes vary in response to environmental changes. wing polyphenism is one of the phenotypes that have not been adequately studied. we developed a cdna microarray from the green peach aphid myzus persicae (sulzer), and compared mrna samples derived from alate and apterous adults. the microarray experiment resulted in 108 significantly changing clones that represented 31 unique ests. among the highest and significantly expressed clones in alat ... | 2006 | 17046599 |
| gene expression and glucosinolate accumulation in arabidopsis thaliana in response to generalist and specialist herbivores of different feeding guilds and the role of defense signaling pathways. | glucosinolate accumulation and expression of glucosinolate biosynthetic genes were studied in response to four herbivores in arabidopsis thaliana (l.) wild-type (columbia) and mutant lines affected in defense signaling. herbivory on wild-type plants led to increased aliphatic glucosinolate content for three of four herbivores tested, the aphid generalist myzus persicae (sulzer), the aphid specialist brevicoryne brassicae (l.), and the lepidopteran generalist spodoptera exigua hübner. the lepidop ... | 2006 | 17049571 |
| the arabidopsis thaliana/myzus persicae model system demonstrates that a single gene can influence the interaction between a plant and a sap-feeding insect. | we have developed an arabidopsis thaliana/myzus persicae model system to allow the dissection of plant/insect interactions at a molecular genetic level. this allows the examination of the role of single plant genes in the interaction between the plant and an aphid. our initial studies have exploited an arabidopsis genotype in which the function of the amino acid transporter ant1 has been abolished. this mutation results in a change in the proportions of several amino acids within the phloem siev ... | 2006 | 17054513 |
| systemin in solanum nigrum. the tomato-homologous polypeptide does not mediate direct defense responses. | we extend ryan's seminal work on the 18-amino acid polypeptide systemin in tomato's (solanum lycopersicum) systemic wound response to the closely related solanaceous species solanum nigrum. we compared wild-type plants to plants transformed with an inverted repeat prosystemin construct (irsys) to silence the expression of the endogenous s. nigrum prosystemin gene. in wild-type plants elicited with wounding + oral secretions from manduca sexta larvae, trypsin-proteinase inhibitors (tpis) accumula ... | 2006 | 17071641 |
| [pathogenicity of hyphomycet fungi to aphids aphis gossypii glover and myzus persicae (sulzer) (hemiptera: aphididae)]. | the aphids aphis gossypii and myzus persicae are cosmopolitan, poliphagous and damage cultivated plants. the effects of the entomopathogenic fungi beauveria bassiana (isolate ibcb 66), metarhizium anisopliae (isolate ibcb 121), paecilomyces fumosoroseus (isolate ibcb 141) and lecanicillium (= verticillium) lecanii (isolate jab 02) on third instar nymphs of a. gossypii and m. persicae were evaluated in the laboratory at 25 degrees c, 70 +/- 10% rh and 12h photophase. the aphids were transferred t ... | 2006 | 17144139 |
| cyanide in the chemical arsenal of garlic mustard, alliaria petiolata. | cyanide production has been reported from over 2500 plant species, including some members of the brassicaceae. we report that the important invasive plant, alliaria petiolata, produces levels of cyanide in its tissues that can reach 100 ppm fresh weight (fw), a level considered toxic to many vertebrates. in a comparative study, levels of cyanide in leaves of young first-year plants were 25 times higher than in leaves of young arabidopsis thaliana plants and over 150 times higher than in leaves o ... | 2007 | 17146719 |
| the efficacy of a novel insecticidal protein, allium sativum leaf lectin (asal), against homopteran insects monitored in transgenic tobacco. | the homopteran group of polyphagous sucking insect pests causes severe damage to many economically important plants including tobacco. allium sativum leaf lectin (asal), a mannose-binding 25-kda homodimeric protein, has recently been found to be antagonistic to various sucking insects in the homopteran group through artificial diet bioassay experiments. the present study describes, for the first time, the expression of the asal coding sequence under the control of the cauliflower mosaic virus (c ... | 2005 | 17147631 |
| novel acetylcholinesterase target site for malaria mosquito control. | current anticholinesterase pesticides were developed during world war ii and are toxic to mammals because they target a catalytic serine residue of acetylcholinesterases (aches) in insects and in mammals. a sequence analysis of aches from 73 species and a three-dimensional model of a malaria-carrying mosquito (anopheles gambiae) ache (agache) reported here show that c286 and r339 of agache are conserved at the opening of the active site of aches in 17 invertebrate and four insect species, respec ... | 2006 | 17183688 |
| characterization of rr-1 and rr-2 cuticular proteins from myzus persicae. | a cdna library for myzus persicae has served to identify sequences coding for cuticular proteins (cps) with rr-1 and rr-2 consensus. two putative cps showed a common rr-2 chitin binding domain (cbd) but differed in their c and n terminals. two other predicted cps showed a typical rr-1 cbd but differed in size and sequence of the c and n terminals. an additional sequence encoding for a protein that showed terminal amino acid repeats similar to those of putative cps from m. persicae, but lacked th ... | 2007 | 17196860 |
| microsatellite marker analysis of peach-potato aphids (myzus persicae, homoptera: aphididae) from scottish suction traps. | the peach-potato aphid myzus persicae (sulzer) is an important vector of plant viruses. a network of suction traps collects aerial samples of this aphid in order to monitor and help predict its spatial distribution and likely impact on virus transmission in crops. a suction trap catch is thought to be a good representation of the total aphid pool. sensitive molecular markers have been developed that determine the genetic composition of the m. persicae population. in scotland, uk, these were appl ... | 2006 | 17201975 |
| detection and characterization of new genotypes of myzus antirrhinii (hemiptera: aphididae) in japan, with evidence for their production of sexual morphs. | two forms of myzus persicae (sulzer), f-15 and r306n', resembling m. antirrhinii (macchiati) in esterase profile have been found in japan. to determine the genetic relationship of f-15 and r306n' with m. antirrhinii, clonal lineages of f-15, r306n' and those of 14 other forms of m. persicae collected in japan were analysed for 17 polymorphic microsatellite dna loci. two microsatellite multi-locus (ms) genotypes of m. persicae and two ms genotypes, ma3 and ma4, of m. antirrhinii from australia we ... | 2006 | 17201978 |
| involvement of the xyloglucan endotransglycosylase/hydrolases encoded by celery xth1 and arabidopsis xth33 in the phloem response to aphids. | during infestation, phloem-feeding insects induce transcriptional reprogramming in plants that may lead to protection. transcripts of the celery xth1 gene, encoding a xyloglucan endotransglycosylase/hydrolase (xth), were previously found to accumulate systemically in celery (apium graveolens) phloem, following infestation with the generalist aphid myzus persicae. xth1 induction was specific to the phloem but was not correlated with an increase in xyloglucan endotransglycosylase (xet) activity in ... | 2007 | 17238910 |
| myzus persicae (green peach aphid) feeding on arabidopsis induces the formation of a deterrent indole glucosinolate. | cruciferous plants produce a wide variety of glucosinolates as a protection against herbivores and pathogens. however, very little is known about the importance of individual glucosinolates in plant defense and the regulation of their production in response to herbivory. when myzus persicae (green peach aphid) feeds on arabidopsis aliphatic glucosinolates pass through the aphid gut intact, but indole glucosinolates are mostly degraded. although aphid feeding causes an overall decrease in arabido ... | 2007 | 17257166 |
| purification and characterization of recombinant ligand-binding domains from the ecdysone receptors of four pest insects. | cloned ecr and usp cdnas encoding the ecdysone receptors of four insect pests (lucilia cuprina, myzus persicae, bemisia tabaci, helicoverpa armigera) were manipulated to allow the co-expression of their ligand binding domains (lbds) in insect cells using a baculovirus vector. recombinant de/f segment pairs (and additionally, for h. armigera, an e/f segment pair) from the ecr and usp proteins associated spontaneously with high affinity to form heterodimers that avidly bound an ecdysteroid ligand. ... | 2007 | 17275327 |
| characterization of resistance to multiple aphid species (hemiptera: aphididae) in medicago truncatula. | aphids are phloem-feeding insects that damage many important crops throughout the world yet, compared to plant-pathogen interactions, little is known about the mechanisms by which plants become resistant to aphids. medicago truncatula (barrel medic) is widely considered as the pre-eminent model legume for genetic and biological research and in australia is an important pasture species. six cultivars of m. truncatula with varying levels of resistance to two pests of pasture and forage legumes, th ... | 2007 | 17298680 |
| contrasting performances of generalist and specialist myzus persicae (hemiptera: aphididae) reveal differential prevalence of maternal effects after host transfer. | transgenerational maternal effects on performance (rm) after host transfer were evaluated in the generalist aphid myzus persicae s.s., and in its subspecies specialized on tobacco, m. persicae nicotianae blackman. we tested whether the performance of these taxa, when reared separately on optimal and suboptimal hosts (as sources of different maternal background) and then transferred to optimal hosts, experienced variations along four successive generations. additionally, to compare the tolerance ... | 2007 | 17298683 |
| temporal synergism by microencapsulation of piperonyl butoxide and alpha-cypermethrin overcomes insecticide resistance in crop pests. | a microencapsulated formulation that gives a burst release of piperonyl butoxide (pbo) several hours before a burst release of a conventional pyrethroid can effectively overcome metabolic resistance in bemisia tabaci gennadius, helicoverpa armigera (hübner), aphis gossypii glover and myzus persicae sulzer. this increase in efficacy against resistant pests was reflected in a field trial against b. tabaci on cotton, eliminating the need for two treatments. the ratio between the active insecticide ... | 2007 | 17304634 |
| a comparison of semiochemically mediated interactions involving specialist and generalist brassica-feeding aphids and the braconid parasitoid diaeretiella rapae. | diaeretiella rapae, a parasitoid that predominately specializes in the parasitism of brassica-feeding aphids, attacks lipaphis erysimi, a specialist feeding aphid of the brassicaceae and other families in the capparales, at a greater rate than the generalist-feeding aphid, myzus persicae. in this study, we investigated the orientation behavior of d. rapae to the volatile chemicals produced when these two aphid species feed on turnip (brassica rapa var rapifera). we showed no significant preferen ... | 2007 | 17333371 |
| opportunism of conidiobolus obscurus stems from depression of infection in situ to progeny colonies of host alatae as disseminators of the aphid-pathogenic fungus. | conidiobolus (entomophthorales: ancylistaceae) includes common aphid pathogens but causes sporadic mycosis worldwide. this epizootiological opportunism was explored herein by examining the potential of mycosis transmission in the progeny colonies of 513 myzus persicae alates as disseminators of c. obscurus often infecting aphids. the alates exposed to spore showers were flown for 2.05 (0.01-8.95) km on flight mills and then reared individually on cabbage at 20-23 degrees c for 14 day colonizatio ... | 2007 | 17359258 |
| effect of some diets on macrolophus pygmaeus rambur (hemiptera: miridae) fitness under laboratory conditions. | fitness parameters of omnivore predatory bug macrolophus pygmaeus were studied on various diets consisting of green peach aphid myzus persicae + eggplant leaf disc, eggs of ephestia kuehniella + eggplant leafdisc, pollen + eggplant leaf disc, eggs of e. kuehniella + pollen + eggplant leaf disc. the experiments were began from 1- day nymphs until 32-day adults. the tests were done at 25 degress c, 65+/-5% rh, 16l: 8d h photoperiod. the results showed that adding floral material to the animal prey ... | 2006 | 17385505 |
| evaluation of hoverfly episyrphus balteatus de geer (diptera: syrphidae) oviposition behaviour toward aphid-infested plants using a leaf disc system. | several aphidophagous beneficials such as parasitoids and predators are known to respond positively to aphid infested plants. semiochemicals from the latter association play an important role in the foraging of predators in a tritrophic approach. in this work, three host plants infested with green peach aphid, myzus persicae sulzer were used to study the effect of prey density and aphid colony location on plant toward episyrphus balteatus female. their reproductive behaviour and efficiency (in t ... | 2006 | 17385507 |
| use of artificial diet system to assess the potential bio-insecticide effect of a fungal lectin from xerocomus chrysenteron (xcl) on myzus persicae. | lectins are carbohydrate binding proteins which are widely distributed in nature: they have been isolated from microorganisms, fungi, plants and animals. many of these proteins were tested for their potential biocide effect on lot of pests. indeed, lectins can cause dramatic changes in the cellular morphology and metabolism, particularly on the digestive system of insect having ingested them, by lectin binding to membrane glycosyl groups of the digestive tract cells. a fungal lectin, namely xero ... | 2006 | 17385518 |
| evaluation of bt-toxin uptake by the non-target herbivore, myzus persicae (hemiptera: aphididae), feeding on transgenic oilseed rape. | as consequence of the concern about the biosafety of genetically modified plants, biological and ecological studies are considered crucial for environmental risk assessment. laboratory experiments were carried out in order to evaluate the transfer of the cry1ac bt-toxin from a transgenic bt-oilseed rape to a non-target pest, myzus persicae sulzer. cry1ac protein levels in plants and aphids were determined using a double sandwich enzyme-linked immunosorbent assay. phloem sap from (bt+) and (bt-) ... | 2007 | 17411484 |
| in vitro association between the helper component-proteinase of zucchini yellow mosaic virus and cuticle proteins of myzus persicae. | potyviruses, as typical non-persistently transmitted viruses, are carried within the stylets of aphids. cuticle proteins (cups), which are a major component of the insect cuticle, were examined for in vitro binding to the potyviral helper component-proteinase (hc-pro). proteins in 8 m urea extracts from myzus persicae were separated by sds-page, electroblotted onto membranes and identified as cups by using specific antibodies to m. persicae cup. blotted m. persicae protein extracts were overlaid ... | 2007 | 17412993 |
| effect of temperature on life history of aphidius colemani and aphidius matricariae (hymenoptera: braconidae), two parasitoids of aphis gossypii and myzus persicae (homoptera: aphididae). | the performance of two aphid parasitoids, aphidius colemani viereck and aphidius matricariae (haliday), against aphis gossypii glover on greenhouse cucumber (cucumis sativus l.) and myzus persicae (sulzer) on sweet pepper (capsicum annuum l.) were evaluated at various constant temperatures. biological parameters of both parasitoids including developmental time, pupal survivorship, percentage of parasitism, and sex ratio of the progeny were studied at 5, 10, 15, 20, 25, 30, and 35 degrees c. at 2 ... | 2007 | 17445360 |
| ligand binding by recombinant domains from insect ecdysone receptors. | the ligand binding domains (lbds) from the ecr and usp proteins of four insect pests (lucilia cuprina, myzus persicae, bemisia tabaci, helicoverpa armigera) were purified as recombinant heterodimers. the k(d) values for [(3)h]-ponasterone a binding by lbd heterodimers that included the hinge regions (i.e., de/f heterodimers) ranged 0.7-2.5 nm, with k(i) values for ecdysteroid and dibenzoylhydrazine ligands ranging from 0.1 nm to >448 microm. the k(d) and k(i) values for a recombinant h. armigera ... | 2007 | 17517338 |
| diversity of detoxification pathways of ingested ecdysteroids among phytophagous insects. | the metabolic pathways of ingested ecdysteroids have been investigated in three insect species, the aphid myzus persicae and two lepidoptera, plodia interpunctella and ostrinia nubilalis. m. persicae produces mainly a 22-glucoside conjugate, whereas p. interpunctella eliminates a mixture of 20e and its 3-oxo and 3-epi derivatives, both in free form and as conjugates with various fatty acids. o. nubilalis only produces fatty acyl ester conjugates. these data point out the great diversity of detox ... | 2007 | 17523174 |
| temporal and spatial incidence of alleles conferring knockdown resistance to pyrethroids in the peach-potato aphid, myzus persicae (hemiptera: aphididae), and their association with other insecticide resistance mechanisms. | the peach-potato aphid, myzus persicae (sulzer), is an important arable pest species throughout the world. extensive use of insecticides has led to the selection of resistance to most chemical classes including organochlorines, organophosphates, carbamates and pyrethroids. resistance to pyrethroids is often the result of mutations in the para-type sodium channel protein (knockdown resistance or kdr). in m. persicae, knockdown resistance is associated with two amino-acid substitutions, l1014f (kd ... | 2007 | 17524156 |
| distribution of common genotypes of myzus persicae (hemiptera: aphididae) in greece, in relation to life cycle and host plant. | microsatellite genotyping was used to identify common clones in populations of the myzus persicae group from various hosts and regions in mainland greece and southern italy and to compare their distribution and occurrence on tobacco and other crops. common clones were defined as genotypes collected at more than one time or in more than one population; and, therefore, unlikely to be participating in the annual sexual phase on peach. sixteen common genotypes were found, accounting for 49.0% of the ... | 2007 | 17524157 |
| transcriptional responses of arabidopsis thaliana ecotypes with different glucosinolate profiles after attack by polyphagous myzus persicae and oligophagous brevicoryne brassicae. | plants are equipped with a range of defence mechanisms against herbivorous insects. in cruciferous species, jasmonic acid, salicylic acid, and ethylene along with glucosinolates and their hydrolysis products play important roles in plant protection and plant-insect communication. in turn, a number of herbivores have adapted to plants that contain glucosinolates. as a result of adaptation to their host plants, specialized insects may elicit different plant-inducible responses than generalists. ol ... | 2007 | 17545220 |
| insecticide resistance status of myzus persicae (hemiptera: aphididae) populations from peach and tobacco in mainland greece. | the susceptibility of 88 and 38 field samples of myzus persicae (sulzer) to imidacloprid and deltamethrin respectively was examined using the fao dip test bioassay. the field samples were collected from tobacco and peach from various regions of greece in the period from 2004 to 2006. in addition, 497, 349 and 370 clones originating from peach and tobacco were screened for the three known resistance mechanisms, elevated esterases, modified acetylcholinesterase (mace) and knockdown resistance (kdr ... | 2007 | 17573686 |
| effect of mixed viral infections (potato virus y-potato leafroll virus) on biology and preference of vectors myzus persicae and macrosiphum euphorbiae (hemiptera: aphididae). | mixed viral infections of heterologous viruses such as potato virus y (family potyviridae, genus potyvirus, pvy) and potato leafroll virus (family luteoviridae, genus polerovirus, plrv) are a regular occurrence in idaho's potato, solanum tuberosum (l.), cropping systems. an increased number of plant samples from idaho's potato fields over the past 2 yr has serologically tested positive for both pvy and plrv via double antibody sandwich enzyme-linked immunosorbent assay (das-elisa) and exhibited ... | 2007 | 17598521 |
| myzus persicae is arrested more by blends than by individual compounds elevated in headspace of plrv-infected potato. | volatiles from potato plants (solanum tuberosum l.) infected with potato leaf roll virus (plrv) attract and arrest the principal vector of plrv, the green peach aphid, myzus persicae (sulzer), more strongly than volatiles from non-infected plants. the total concentration of volatiles detectable in the headspace of plrv-infected plants is greater than that in the headspace of non-infected controls, and the relative composition is altered. to determine the basis of the aphid response to plrv-infec ... | 2007 | 17680312 |
| biochemistry and molecular biology of arabidopsis-aphid interactions. | to ensure their survival in natural habitats, plants must recognize and respond to a wide variety of insect herbivores. aphids and other hemiptera pose a particular challenge, because they cause relatively little direct tissue damage when inserting their slender stylets intercellularly to feed from the phloem sieve elements. plant responses to this unusual feeding strategy almost certainly include recognition of aphid salivary components and the induction of phloem-specific defenses. due to the ... | 2007 | 17691101 |
| antifeedant and phytotoxic activity of cacalolides and eremophilanolides. | the antifeedant effect of six cacalolides and six eremophilanolides was tested against the herbivorous insects spodoptera littoralis, leptinotarsa decemlineata, and myzus persicae. the test compounds included several natural products isolated from senecio madagascariensis (14-isovaleryloxy-1,2-dehydrocacalol methyl ether, 4), s. barba-johannis (13-hydroxy-14-oxocacalohastine, 5; 13-acetyloxy-14-oxocacalohastine, 6) and s. toluccanus [6-hydroxyeuryopsin, 7; 1(10)-epoxy-6-hydroxyeuryopsin, 9; tolu ... | 2017 | 17708441 |
| cross-species transferability of microsatellite markers from six aphid (hemiptera: aphididae) species and their use for evaluating biotypic diversity in two cereal aphids. | the abundance and distribution of microsatellites, or simple sequence repeats (ssrs) were explored in the expressed sequence tag (est) and genomic sequences of the pea aphid, acyrthosiphon pisum (harris), and the green peach aphid, myzus persicae (sulzer). a total of 108 newly developed, together with 40 published, ssr markers were investigated for their cross-species transferability among six aphid species. genetic diversity among six greenbug, schizaphis graminum (rondani) and two russian whea ... | 2007 | 17714463 |
| phloem-based resistance to green peach aphid is controlled by arabidopsis phytoalexin deficient4 without its signaling partner enhanced disease susceptibility1. | green peach aphid (gpa) myzus persicae (sülzer) is a phloem-feeding insect with an exceptionally wide host range. previously, it has been shown that arabidopsis thaliana phytoalexin deficient4 (pad4), which is expressed at elevated levels in response to gpa infestation, is required for resistance to gpa in the arabidopsis accession columbia. we demonstrate here that the role of pad4 in the response to gpa is conserved in arabidopsis accessions wassilewskija and landsberg erecta. electrical monit ... | 2007 | 17725549 |
| strong parasitoid-mediated selection in experimental populations of aphids. | clonal diversity in asexual populations may be maintained if different clones are favoured under different environmental conditions. for aphids, parasitoids are an important variable of the biotic environment. to test whether parasitoids can mediate selection among host clones, we used experimental populations consisting of 10 clones of the peach-potato aphid, myzus persicae, and allowed them to evolve for several generations either without parasitoids or in the presence of two species of parasi ... | 2007 | 17785263 |
| fatty acids: in vivo synthesis by the green peach aphid, myzus persicae (sulzer). | after feeding through an artificial membrane on an 18 percent sucrose solution containing either acetate-1-c(14) or uniformly-labeled glucose-c(14), myzus persicae incorporated 75 percent of the carbon-14 into palmitoleic, stearic, and oleic acids. small amounts were incorporated into myristic, linoleic, and linolenic acids; no significant amounts were incorporated into the short-chain fatty acids. | 1963 | 17836485 |
| role of myzus persicae (hemiptera: aphididae) and its secondary hosts in plum pox virus propagation. | plum pox virus (family potyviridae, genus potyvirus, ppv) is one of the most important viral pathogens of plants in the genus prunus, particularly prunus persica l. the role of the myzus persicae (sulzer) (hemiptera: aphididae) as a vector of ppv-m, and its role in spreading ppv-m, was investigated. ppv-m-infected peach trees were used as inoculum sources, and transmission to 15 herbaceous species commonly present in and around peach orchards was evaluated. the presence of ppv-m in secondary hos ... | 2007 | 17849850 |
| effects of kaolin particle film on myzus persicae (hemiptera: aphididae) behaviour and performance. | the emergence of resistance mechanisms to, and revocation of, many insecticides used in the control of the polyphagus aphid pest, myzus persicae (sulzer), has increased the pressure to develop novel approaches for the control of the pest in many crops. kaolin-based particle films provide a physical barrier against insect pests and show considerable potential for controlling m. persicae. we conducted a series of laboratory experiments to investigate the mode of action of kaolin against aphids. th ... | 2007 | 17916264 |
| exploring plant responses to aphid feeding using a full arabidopsis microarray reveals a small number of genes with significantly altered expression. | the aim of this study was to determine which arabidopsis thaliana (l.) genes had significantly altered expression following 2-36 h of infestation by the aphid myzus persicae (sulzer). six biological replicates were performed for both control and treatment at each time point, allowing rigorous statistical analysis of any changes. only two genes showed altered expression after 2 h (one up- and one down-regulated) while two were down-regulated and twenty three were up-regulated at 36 h. the transcr ... | 2007 | 17916270 |
| temporal synergism can enhance carbamate and neonicotinoid insecticidal activity against resistant crop pests. | piperonyl butoxide (pbo) effectively synergises synthetic pyrethroids, rendering even very resistant insect pests susceptible, provided a temporal element is included between exposure to synergist and insecticide. this concept is now applied to carbamates and neonicotinoids. | 2008 | 17926308 |
| effects of lecanicillium longisporum infection on the behaviour of the green peach aphid myzus persicae. | the effects of the entomopathogenic fungus lecanicillium longisporum (zimmerman) zare & gams on three parameters of behaviour (feeding, reproduction and movement) of the green peach aphid myzus persicae (homoptera: aphididae) were investigated in the laboratory. visual analysis of video tapes established that honeydew excretion events of mycosed aphids gradually declined from 2 d post inoculation and reproduction rate was significantly reduced 2 d prior to death (which occurred on day 6); both p ... | 2008 | 17942112 |
| effect of the presence of a nonhost herbivore on the response of the aphid parasitoid diaeretiella rapae to host-infested cabbage plants. | the vast majority of studies of plant indirect defense strategies have considered simple tritrophic systems that involve plant responses to attack by a single herbivore species. however, responses by predators and parasitoids to specific, herbivore-induced, volatile blends could be compromised when two or more different herbivores are feeding on the same plant. in y-tube olfactometer studies, we investigated the responses of an aphid parasitoid, diaeretiella rapae (mcintosh) (hymenoptera: bracon ... | 2007 | 17968626 |
| sensitivity and speed of induced defense of cabbage (brassica oleracea l.): dynamics of bolox expression patterns during insect and pathogen attack. | the lipoxygenase pathway is involved in the early steps of plant responses to herbivorous insects and phytopathogens. induced defenses in the crucifer brassica oleracea have been well documented. here, we have cloned a lipoxygenase (lox) from b. oleracea (bolox). the sequence reveals that the bolox protein has a transit peptide for chloroplast targeting, which is characteristic for class 2 loxs involved in jasmonic acid (ja) biosynthesis which takes place in the chloroplast. phylogenetic analysi ... | 2007 | 17977145 |
| genomic resources for myzus persicae: est sequencing, snp identification, and microarray design. | the green peach aphid, myzus persicae (sulzer), is a world-wide insect pest capable of infesting more than 40 plant families, including many crop species. however, despite the significant damage inflicted by m. persicae in agricultural systems through direct feeding damage and by its ability to transmit plant viruses, limited genomic information is available for this species. | 2007 | 18021414 |
| clonal turnover of mace-carrying peach-potato aphids (myzus persicae (sulzer), homoptera: aphididae) colonizing scotland. | peach-potato aphids, myzus persicae (sulzer), collected in scotland in the years 1995 and 2002-2004 were characterized using four microsatellite loci and three insecticide resistance mechanisms. from 868 samples, 14 multilocus genotypes were defined (designated clones a-n). five of these (denoted a, b, h, m and n) carried modified acetylcholinesterase (mace) resistance, the most recent resistance mechanism to have evolved in m. persicae. the current paper shows that the continued presence of mac ... | 2008 | 18076780 |
| characterization of the m918t sodium channel gene mutation associated with strong resistance to pyrethroid insecticides in the peach-potato aphid, myzus persicae (sulzer). | recent advances in the characterisation of insect sodium channel gene sequences have identified a small number of point mutations within the channel protein that are implicated in conferring target-site resistance to pyrethroid insecticides (so-called knockdown resistance or kdr). the l1014f (leucine-to-phenylalanine) mutation located in the centre of segment 6 of the domain ii region (iis6) of the sodium channel (the so-called kdr trait) has been detected in the peach-potato aphid, myzus persic ... | 2008 | 18076786 |
| factors affecting the activity of alatae of the aphids myzus persicae (sulzer) and brevicoryne brassicae (l.). | 1949 | 18116923 | |
| the grouping and overwintering of myzus persicae sulz. on prunus species. | 1949 | 18143239 | |
| soybean oil-degrading bacterial cultures as a potential for control of green peach aphids (myzus persicae). | microorganisms capable of degrading crude oil were isolated and grown in soybean oil as a sole carbon source. the microbial cultures were used to control green peach aphids in vitro. approximately 60% mortality of aphids was observed when the cultures were applied alone onto aphids. to examine the cultures as a pesticide formulation mixture, the cultures were combined with a low dose of the insecticide imidacloprid (one-fourth dose of recommended field-application rate) and applied onto aphids. ... | 2007 | 18156788 |
| selection of entomopathogenic fungi for aphid control. | twelve strains of entomopathogenic fungi such as lecanicillium lecanii, paecilomyces farinosus, beauveria bassiana, metarhizium anisopliae, cordyceps scarabaeicola, and nomuraea rileyi were screened for aphid control. at 25 degrees c and 75% relative humidity (rh), among tested entomopathogenic fungi, l. lecanii 41185 showed the highest virulent pathogenicity for both myzus persicae and aphis gossypii, and their control values were both nearly 100% 5 and 2 d after treatment, respectively. moreov ... | 2007 | 18215637 |
| intraspecific variation in zucchini yellow mosaic virus transmission by myzus persicae and the impact of aphid host plant. | three isofemale lines of myzus persicae (sulzer), two lines collected from and reared on a brassicaceous host, and one line collected from and reared on a malvaceous host, were evaluated for their efficiency of transmitting zucchini yellow mosaic virus (family potyviridae, genus potyvirus, zymv). in the first experiment, the transmission efficiencies of two clones from brassicaceae (b1 and b2) were 52.0 and 60.8%, respectively, and these transmissions were not significantly different. in a secon ... | 2007 | 18232392 |
| genetic variation and covariation of susceptibility to parasitoids in the aphid myzus persicae: no evidence for trade-offs. | parasitoids are an important mortality factor for insects. susceptibility to parasitoids should thus be under strong negative selection. nevertheless, ample genetic variation for susceptibility to parasitoids is commonly observed in natural populations, suggesting that trade-offs may constrain the evolution of reduced susceptibility. this can be studied by assessing genetic variation for susceptibility and its covariation with other components of fitness. in a set of 17 clones of the peach potat ... | 2008 | 18270153 |
| bioactive triterpene derivatives from latex of two euphorbia species. | we have investigated the antifeedant and toxic effects of 23 semisynthetic terpenoid derivatives obtained through chemical modifications of the major components of euphorbia resinifera (alpha-euphol and alpha-euphorbol) and e. officinarum (obtusifoliol and 31-norlanostenol) latex on several insect species (spodoptera littoralis, myzus persicae and rhopalosiphum padi), their selective cytotoxicity on insect sf9 and mammalian cho cells and their phytotoxic effects on lactuca sativa. the conversion ... | 2008 | 18304594 |
| reproduction and feeding behavior of myzus persicae on four cereals. | green peach aphid, myzus persicae (sulzer), does not overwinter outdoors in minnesota; it arrives each spring on low-level jet streams from the south. after arrival, anholocylic reproduction occurs on numerous herbaceous species, including many common weeds, before movement to potato, solanum tuberosum l. in investigating aphid feeding behavior on barrier crops, we observed winter wheat, triticum aestivum l., colonized by green peach aphid. the northern great plains grows 94,000 ha of potatoes a ... | 2008 | 18330110 |
| enantiospecific effect of pulegone and pulegone-derived lactones on myzus persicae (sulz.) settling and feeding. | the effect of pulegone chiral center configuration on its antifeedant activity to myzus persicae was examined. biological consequences of structural modifications of (r)-(+)- and (s)-(-)-pulegone, the lactonization, iodolactonization, and incorporation of hydroxyl and carbonyl groups were studied, as well. the most active compounds were (r)-(+)-pulegone (1a) and delta-hydroxy-gamma-spirolactones (5s,6r,8s)-(-)-6-hydroxy-4,4,8-trimethyl-1-oxaspiro[4.5]decan-2-one (5b) and (5r,6s,8s)-6-hydroxy-4,4 ... | 2008 | 18340487 |
| resting spore formation of aphid-pathogenic fungus pandora nouryi depends on the concentration of infective inoculum. | resting spore formation of some aphid-pathogenic entomophthorales is important for the seasonal pattern of their prevalence and survival but this process is poorly understood. to explore the possible mechanism involved in the process, pandora nouryi (obligate aphid pathogen) interacted with green peach aphid myzus persicae on cabbage leaves under favourable conditions. host nymphs showered with primary conidia of an isolate (lc(50): 0.9-6.7 conidia mm(-2) 4-7 days post shower) from air captures ... | 2008 | 18341580 |
| identification of indole glucosinolate breakdown products with antifeedant effects on myzus persicae (green peach aphid). | the cleavage of glucosinolates by myrosinase to produce toxic breakdown products is a characteristic insect defense of cruciferous plants. although green peach aphids (myzus persicae) are able to avoid most contact with myrosinase when feeding from the phloem of arabidopsis thaliana, indole glucosinolates are nevertheless degraded during passage through the insects. a defensive role for indole glucosinolates is suggested by the observation that atr1d mutant plants, which overproduce indole gluco ... | 2008 | 18346197 |
| identification of aphid salivary proteins: a proteomic investigation of myzus persicae. | the role of insect saliva in the first contact between an insect and a plant is crucial during feeding. some elicitors, particularly in insect regurgitants, have been identified as inducing plant defence reactions. here, we focused on the salivary proteome of the green peach aphid, myzus persicae. proteins were either directly in-solution digested or were separated by 2d sds-page before trypsin digestion. resulting peptides were then identified by mass spectrometry coupled with database investig ... | 2008 | 18353105 |
| cis-jasmone induces arabidopsis genes that affect the chemical ecology of multitrophic interactions with aphids and their parasitoids. | it is of adaptive value for a plant to prepare its defenses when a threat is detected, and certain plant volatiles associated with insect damage, such as cis-jasmone (cj), are known to switch-on defense metabolism. we used aphid and aphid parasitoid responses to arabidopsis thaliana as a model system for studying gene expression and defense chemistry and its impact at different trophic levels. differential responses to volatiles of induced arabidopsis occurred for specialist and generalist insec ... | 2008 | 18356298 |
| distinct roles of jasmonates and aldehydes in plant-defense responses. | many inducible plant-defense responses are activated by jasmonates (jas), c(6)-aldehydes, and their corresponding derivatives, produced by the two main competing branches of the oxylipin pathway, the allene oxide synthase (aos) and hydroperoxide lyase (hpl) branches, respectively. in addition to competition for substrates, these branch-pathway-derived metabolites have substantial overlap in regulation of gene expression. past experiments to define the role of c(6)-aldehydes in plant defense resp ... | 2008 | 18382679 |
| comparative transcriptome analysis of arabidopsis thaliana infested by diamond back moth (plutella xylostella) larvae reveals signatures of stress response, secondary metabolism, and signalling. | plants are exposed to attack from a large variety of herbivores. feeding insects can induce substantial changes of the host plant transcriptome. arabidopsis thaliana has been established as a relevant system for the discovery of genes associated with response to herbivory, including genes for specialized (i.e. secondary) metabolism as well as genes involved in plant-insect defence signalling. | 2008 | 18400103 |
| effect of an alternate weed host, hairy nightshade, solanum sarrachoides, on the biology of the two most important potato leafroll virus (luteoviridae: polerovirus) vectors, myzus persicae and macrosiphum euphorbiae (aphididae: homoptera). | hairy nightshade, solanum sarrachoides (sendtner), is a ubiquitous weed in potato agro-ecosystems and nonagricultural lands of southeastern idaho and the pacific northwest. this weed increases the complexity of the potato leafroll virus (plrv) (luteoviridae: polervirus)-potato pathosystem by serving as aphid and virus reservoir. previous field studies showed higher densities of green peach aphid, myzus persicae (sulzer), and potato aphid, macrosiphum euphorbiae (thomas), the two most important v ... | 2008 | 18419933 |
| studies on biology and genomic characterization of a caulimo-like virus associated with a leaf distortion disease of lamium maculatum. | a virus associated with leaf distortion of lamium maculatum had features characteristic of caulimoviruses. the viral genome (genbank accession number: eu554423) is 7,713 bp in size, with six open reading frames similar in size and organization to those of known caulimoviruses. phylogenetic analyses based on the conserved orf v polyprotein coding region indicated that the lamium virus is a possible new member of the genus caulimovirus. the virus was not transmitted by mechanical or graft inoculat ... | 2008 | 18458813 |
| wild solanum resistance to aphids: antixenosis or antibiosis? | the type (antixenosis or antibiosis) of resistance against the aphids myzus persicae (sulzer) and macrosiphum euphorbiae (thomas) was characterized for the wild tuber-bearing potatoes, solanum chomatophilum bitter and solanum stoloniferum schltdl. & bouché through behavioral (olfactometry and electrical penetration graph) and physiological studies. in dual-choice assays, only s. stoloniferum exerted attraction to m. euphorbiae. this ruled out the possibility that plant volatiles of s. chomatophi ... | 2008 | 18459428 |
| characterization of a novel aphid prenyltransferase displaying dual geranyl/farnesyl diphosphate synthase activity. | we report on the cdna cloning and characterization of a novel short-chain isoprenyl diphosphate synthase from the aphid myzus persicae. of the three ipps cdnas we cloned, two yielded prenyltransferase activity following expression in escherichia coli; these cdnas encode identical proteins except for the presence, in one of them, of an n-terminal mitochondrial targeting peptide. although the aphid enzyme was predicted to be a farnesyl diphosphate synthase by blastp analysis, rmpipps, when isopent ... | 2008 | 18466770 |
| a novel assay reveals the blockade of esterases by piperonyl butoxide. | conventional in vitro assays sometimes fail to reveal esterase inhibition by piperonyl butoxide (pbo), although synergism studies suggest loss of esterase-mediated sequestration of insecticide does take place. a new in vitro assay has been devised that routinely reveals binding between pbo and these esterases. | 2008 | 18481337 |
| [quality of different aphids as hosts of the parasitoid lysiphlebus testaceipes (cresson) (hymenoptera: braconidae, aphidiinae)]. | lysiphlebus testaceipes (cresson) has a broad aphid host range; however the quality of these preys may interfere in its biological feature. this study aimed to evaluate the quality of three macrosiphini, brevicoryne brassicae (l.), lipaphis erysimi (kaltenbach) and myzus persicae (sulzer), and three aphidini schizaphis graminum (rondani) rhopalosiphum maidis (fitch) and aphis gossypii glover as hosts to l. testaceipes and to determine the relation possible of host preference, of size and quality ... | 2008 | 18506297 |
| [use of silicon as inductor of the resistance in potato to myzus persicae (sulzer) (hemiptera: aphididae)]. | the aphid myzus persicae (sulzer) is an important pest of potato and causes direct harm, due to the quantity of sap extracted and for being vector of important phytovirus. this work was carried out to evaluate the action of silicon as a resistance inducer of potato to m. persicae. four treatments were tried: foliar fertilization with silicon acid at 1%; soil fertilization with 250 ml silicic acid solution at 1%; foliar fertilization with silicon acid at 1% + soil fertilization with 250 ml silici ... | 2008 | 18506299 |
| antifeedant and phytotoxic activity of the sesquiterpene p-benzoquinone perezone and some of its derivatives. | the sesquiterpene p-benzoquinone perezone (1), isolated from perezia adnata var. alamani (asteraceae), and its non-natural derivatives isoperezone (2), dihydroperezone (3), dihydroisoperezone (4), and anilidoperezone (5) were tested as antifeedants against the herbivorous insects spodoptera littoralis, leptinotarsa decemlineata, and myzus persicae. compounds 1-5 exhibited strong antifeedant activity against l. decemlineata and m. persicae, and elicited a low response by s. littoralis. antifeedan ... | 2008 | 18528728 |
| antifeedant activity of some polygodial derivatives. | polygodial (1) and its derivatives acetal 2 (propylene) and 3 (ethylene) were prepared and their antifeedant activity and toxic effects evaluated on several insect species with different feeding ecologies (spodoptera littoralis, leptinotarsa decemlineata, myzus persicae and rhopalosiphum padi) along with that of polygonone (4). we also tested their selective cytotoxic effects on insect-derived (spodoptera frugiperda ovarian sf9 cells) and mammalian chinese hamster ovary (cho) cells. the antifeed ... | 2008 | 18533465 |
| antifeedant and phytotoxic activity of hydroxyperezone and related molecules. | the insect antifeedant and toxic activity of hydroxyperezone (1), its derivatives 2-9, along with 3-hydroxy- (10) and 6-hydroxythymoquinone (11) were studied against spodoptera littoralis, leptinotarsa decemlineata, and myzus persicae. the antifeedant tests showed that l. decemlineata was the most sensitive insect, followed by m. persicae, while s. littoralis was not deterred by compounds 1-11. leucohydroxyperezone tetraacetate (3), oxoperezinone (6), dihydroleucoperezinone diacetate (7), 3-hydr ... | 2011 | 18533466 |
| two different farnesyl diphosphate synthase genes exist in the genome of the green peach aphid, myzus persicae. | farnesyl diphosphate synthase (fps; ec 2.5.1.1, 2.5.1.10) catalyzes biosynthesis of farnesyl diphosphate, which is important to insects as the precursor of juvenile hormone and the substrate for (e)-beta-farnesene synthase. here, two fps cdnas were isolated from the green peach aphid, myzus persicae (eu334430 and eu334431). their shared identity within the coding region is approximately 82%. the deduced amino acid sequences of the two m. persicae fps cdnas have the highly conserved motifs charac ... | 2008 | 18545274 |
| inheritance of l1014f and m918t sodium channel mutations associated with pyrethroid resistance in myzus persicae. | two amino acid substitutions (l1014f and m918t) in the voltage-gated sodium channel confer target-site resistance to pyrethroid insecticides in the peach potato aphid, myzus persicae. pyrethroid-resistant and -susceptible m. persicae clones with various combinations of these mutations were crossed under laboratory conditions, and the genotypes of aphid progeny were analysed by direct dna sequencing of the iis4-s6 region of the sodium channel gene. segregation patterns showed that in aphids heter ... | 2008 | 18559312 |
| a-to-i rna editing alters less-conserved residues of highly conserved coding regions: implications for dual functions in evolution. | the molecular mechanism and physiological function of recoding by a-to-i rna editing is well known, but its evolutionary significance remains a mystery. we analyzed the rna editing of the kv2 k(+) channel from different insects spanning more than 300 million years of evolution: drosophila melanogaster, culex pipiens (diptera), pulex irritans (siphonaptera), bombyx mori (lepidoptera), tribolium castaneum (coleoptera), apis mellifera (hymenoptera), pediculus humanus (phthiraptera), and myzus persi ... | 2008 | 18567816 |
| investigations into plant biochemical wound-response pathways involved in the production of aphid-induced plant volatiles. | feeding damage to plants by insect herbivores induces the production of plant volatiles, which are attractive to the herbivores natural enemies. little is understood about the plant biochemical pathways involved in aphid-induced plant volatile production. the aphid parasitoid diaeretiella rapae can detect and respond to aphid-induced volatiles produced by arabidopsis thaliana. when given experience of those volatiles, it can learn those cues and can therefore be used as a novel biosensor to dete ... | 2008 | 18583348 |
| increasing enemy biodiversity strengthens herbivore suppression on two plant species. | concern over biodiversity loss, especially at higher trophic levels, has led to a surge in studies investigating how changes in natural enemy diversity affect community and ecosystem functioning. these studies have found that increasing enemy diversity can strengthen, weaken, and not affect prey suppression, demonstrating that multi-enemy effects on prey are context-dependent. here we ask how one factor, plant species identity, influences multi-enemy effects on prey. we focused on two plant spec ... | 2008 | 18589525 |
| genetic variation and covariation of aphid life-history traits across unrelated host plants. | a central paradigm of life-history theory is the existence of resource mediated trade-offs among different traits that contribute to fitness, yet observations inconsistent with this tenet are not uncommon. we previously found a clonal population of the aphid myzus persicae to exhibit positive genetic correlations among major components of fitness, resulting in strong heritable fitness differences on a common host. this raises the question of how this genetic variation is maintained. one hypothes ... | 2008 | 18590593 |
| behavior of bird cherry-oat aphid and green peach aphid in relation to potato virus y transmission. | potato virus y is transmitted to potato in a nonpersistent manner by many aphid species, some of which do not colonize this crop. the behavior of bird cherry-oat aphid, rhopalosiphum padi (l.) on potato, solanum tuberosum l., a plant species that is not colonized by this aphid, was described and compared with that of the potato-colonizing green peach aphid, myzuspersicae (sulzer). a higher proportion of winged morph of r. padi than m. persicae left the plant, but aphids that stayed in contact wi ... | 2008 | 18613572 |
| different helper factors associated with aphid transmission of some potyviruses. | myzus persicae transmitted watermelon mosaic virus (wmv) after acquiring it through artificial membranes from a solution of purified virus mixed with the soluble fraction from infected leaf extracts or by prefeeding on the soluble fraction before acquiring purified virus. wmv-induced helper factor assisted m. persicae in transmitting purified turnip mosaic virus (tumv) but not potato virus y (pvy). tumv-induced helper factor from infected leaves was ineffective for the transmission of purified w ... | 1981 | 18635077 |
| overexpression of the apple alcohol acyltransferase gene alters the profile of volatile blends in transgenic tobacco leaves. | alcohol acyltransferases (aats) are key enzymes in ester biosynthesis. previous studies have found that aat may be a stress-related gene. to investigate further the function of the apple alcohol acyltransferase gene (mdaat2), transgenic tobacco plants overexpressing mdaat2 were generated. gas chromatography-mass spectroscopy analysis showed that the volatile blends were altered in these transgenic tobacco leaves. although no apple-fruity volatile esters were detected in transgenic tobacco leaves ... | 2008 | 18636987 |
| the effect of helper component on the uptake and localization of potyviruses in myzus persicae. | 125i-labeled virions were used to determine whether helper component (hc) affected the uptake or distribution of potyviruses in aphids. aphids were allowed to acquire purified, 125i-labeled tobacco etch virus or potato virus y mixed with hc or with inactivated hc. helper component had no effect upon uptake of labeled virus, as measured by gamma counting. autoradiography of freeze-sectioned aphids revealed, however, that in the presence of hc, label was associated with the maxillary stylets and w ... | 1986 | 18640647 |
| cloning and characterisation of a prenyltransferase from the aphid myzus persicae with potential involvement in alarm pheromone biosynthesis. | the majority of aphid species release an alarm pheromone with the most common component being the sesquiterpene (e)-beta-farnesene, sometimes accompanied by other sesquiterpenes or monoterpenes. the genes/enzymes involved in the production of these compounds have not been identified in aphids although some components of isoprenoid biosynthesis have been identified in other insect species. here we report the cloning, expression and characterisation of a prenyltransferase from the aphid myzus pers ... | 2008 | 18651925 |
| cre/lox system to develop selectable marker free transgenic tobacco plants conferring resistance against sap sucking homopteran insect. | a binary expression vector was constructed containing the insecticidal gene allium sativum leaf agglutinin (asal), and a selectable nptii marker gene cassette, flanked by lox sites. similarly, another binary vector was developed with the chimeric cre gene construct. transformed tobacco plants were generated with these two independent vectors. each of the t(0) lox plants was crossed with t(0) cre plants. pcr analyses followed by the sequencing of the target t-dna part of the hybrid t(1) plants de ... | 2008 | 18663453 |