Publications

TitleAbstractYear(sorted descending)
Filter
PMID
Filter
comparative proteomic analysis of horseweed (conyza canadensis) biotypes identifies candidate proteins for glyphosate resistance.emergence of glyphosate-resistant horseweed (conyza canadensis) biotypes is an example of how unrelenting use of a single mode of action herbicide in agricultural weed control drives genetic adaptation in targeted species. while in other weeds glyphosate resistance arose from target site mutation or target gene amplification, the resistance mechanism in horseweed uses neither of these, being instead linked to reduced herbicide uptake and/or translocation. the molecular components underpinning ho ...201728198407
a genome-wide survey of the microsatellite content of the globe artichoke genome and the development of a web-based database.the recently acquired genome sequence of globe artichoke (cynara cardunculus var. scolymus) has been used to catalog the genome's content of simple sequence repeat (ssr) markers. more than 177,000 perfect ssrs were revealed, equivalent to an overall density across the genome of 244.5 ssrs/mbp, but some 224,000 imperfect ssrs were also identified. about 21% of these ssrs were complex (two stretches of repeats separated by <100 nt). some 73% of the ssrs were composed of dinucleotide motifs. the ss ...201627648830
the korean herbal medicine, do in seung gi-tang, attenuates atherosclerosis via ampk in high-fat diet-induced apoe(-/-) mice.do in seung gi-tang (disgt) is an herbal mixture of traditional korean medicine that is composed of rheum undulatum linne, prunus persica (l.) batsch, conyza canadensis l., cinnamomum cassia presl, and glycytthiza uralensis fischer (8: 6: 4: 4: 4 ratio). we investigated the effect of disgt on vascular inflammation and lipid accumulation in apolipoprotein e-deficient (apoe(-/-)) mice.201627608856
biodegradation of mixed pahs by pah-degrading endophytic bacteria.endophytic bacteria can promote plant growth, induce plant defence mechanisms, and increase plant resistance to organic contaminants. the aims of the present study were to isolate highly pah-degrading endophytic bacteria from plants growing at pah-contaminated sites and to evaluate the capabilities of these bacteria to degrade polycyclic aromatic hydrocarbons (pahs) in vitro, which will be beneficial for re-colonizing target plants and reducing plant pah residues through the inoculation of plant ...201627517944
environmental conditions influence induction of key abc-transporter genes affecting glyphosate resistance mechanism in conyza canadensis.conyza canadensis has been reported to be the most frequent weed species that evolved resistance to glyphosate in various parts of the world. the objective of the present study was to investigate the effect of environmental conditions (temperature and light) on the expression levels of the epsps gene and two major abc-transporter genes (m10 and m11) on glyphosate susceptible (gs) and glyphosate resistant (gr) horseweed populations, collected from several regions across greece. real-time pcr was ...201627104532
biology and management of two important conyza weeds: a global review.weed management is one of the prime concerns for sustainable crop production. conyza bonariensis and conyza canadensis are two of the most problematic, noxious, invasive and widespread weeds in modern-day agriculture. the biology, ecology and interference of c. bonariensis and c. canadensis have been reviewed here to highlight pragmatic management options. both these species share a unique set of biological features, which enables them to invade and adapt a wide range of environmental conditions ...201627798798
effects of elemental sulphur on heavy metal uptake by plants growing on municipal sewage sludge.in this study experiment was carried out to determine the phytoextraction potential of six plant species (conium maculatum, brassica oleraceae var. oleraceae, brassica juncea, datura stramonium, pelargonium hortorum and conyza canadensis) grown in a sewage sludge medium amended with metal uptake promoters. the solubility of cu, cd and pb was significantly increased with the application of elemental s due to decrease of ph. faecal coliform number was markedly decreased by addition of elemental su ...201626496839
mycobiota of the weed conyza canadensis (asteraceae) in brazil.conyza canadensis is a noxious and notably problematic weed in brazil whose control is greatly challenging due to the appearance, in the last years, of herbicide resistant populations. an investigation regarding the associated pathogenic fungi of this plant was conducted in brazil aimed at starting a biological control program to help mitigate its economic impact. ten fungal species were yielded and described: two ascomycetes (leptosphaerulina conyzicola sp. nov. and wentiomyces melioloides), fi ...201627567718
chemical composition, herbicidal and antifungal activity of satureja cuneifolia essential oils from spain.the chemical composition of essential oils from satureja cuneifolia growing in east spain was analyzed by gc, gc/ms. forty-five compounds accounting for 99.1% of the total oil were identified. camphor (47.6%), followed by camphene (13.6%) were the main compounds. their herbicidal and antifungal activity was tested in vitro against three weeds (amaranthus hybridus, portulaca oleracea and conyza canadensis) and eleven common pathogenic or saprophytic fungi (phytophthora citrophthora, p. palmivora, ...201627534131
3-β-εrythrodiol isolated from conyza canadensis inhibits mkn‑45 human gastric cancer cell proliferation by inducing apoptosis, cell cycle arrest, dna fragmentation, ros generation and reduces tumor weight and volume in mouse xenograft model.the objective of the present study was to investigate the in vitro and in vivo anticancer and apoptotic effects of 3-β-erythrodiol, a plant-derived triterpene against mkn-45 human gastric cancer cells. in addition, effects on cellular morphology, cell cycle phase distribution, dna fragmentation, and ros generation were also elucidated in the current research work. cytotoxic activity of 3-β-erythrodiol was demonstrated by mtt cell viability and ldh assay. cellular morphological study was carried ...201626846256
lead tolerance mechanism in conyza canadensis: subcellular distribution, ultrastructure, antioxidative defense system, and phytochelatins.we used hydroponic experiments to examine the effects of different concentrations of lead (pb) on the performance of the pb-tolerable plant conyza canadensis. in these experiments, most of the pb was accumulated in the roots; there was very little pb accumulated in stems and leaves. c. canadensis is able to take up significant amounts of pb whilst greatly restricting its transportation to specific parts of the aboveground biomass. high pb concentrations inhibited plant growth, increased membrane ...201626733305
occurrence of an herbicide-resistant plant trait in agricultural field margins.agricultural environments allow study of evolutionary change in plants. an example of evolution within agroecological systems is the selection for resistance to the herbicide glyphosate within the weed, conyza canadensis. changes in survivorship and reproduction associated with the development of glyphosate resistance (gr) may impact fitness and influence the frequency of occurrence of the gr trait. we hypothesized that site characteristics and history would affect the occurrence of gr c. canade ...201526445665
phytoaccumulation of heavy metals in natural vegetation at the municipal wastewater site in abbottabad, pakistan.heavy metal accumulation in crops and soils from wastewater irrigation poses a significant threat to the human health. a study was carried out to investigate the removal potential of heavy metals (hm) by native plant species, namely cannabis sativa l., chenopodium album l., datura stramonium l., sonchus asper l., amaranthus viridus l., oenothera rosea (lher), xanthium stramonium l., polygonum macalosa l., nasturtium officinale l. and conyza canadensis l. growing at the municipal wastewater site ...201526366840
in vitro screening of cymbopogon jwarancusa and conyza canadensis against liver flukes.aim of present study was to screen medicinal plants for flukicidal activity in vitro to develop alternative sources of treatment for trematodes infection. for this purpose, crude methanolic extracts (cme) of cymbopogn jwarancusa and conyza canadensis were prepared and live adult flukes viz; fasciola gigantica, and paramphistomum cervi isolated from liver and bile ducts of slaughtered buffalo were subjected to different drug concentrations as well as positive and negative control. motility inhibi ...201526695200
conyza species: distribution and evolution of multiple target-site herbicide resistances.distribution of conyza species is well correlated with human interference. multiple herbicide resistance is caused by the attempt to overcome resistance to one mode of action by overuse of another. conyza canadensis (cc) and conyza bonariensis (cb) are troublesome weeds around the world. extensive use of herbicides has led to the evolution of numerous conyza spp. herbicide-resistant populations. seeds of 91 cc and cb populations were collected across israel. they were mostly found (86 %) in road ...201525912190
wind-mediated horseweed (conyza canadensis) gene flow: pollen emission, dispersion, and deposition.horseweed (conyza canadensis) is a problem weed in crop production because of its evolved resistance to glyphosate and other herbicides. although horseweed is mainly self-pollinating, glyphosate-resistant (gr) horseweed can pollinate glyphosate-susceptible (gs) horseweed. to the best of our knowledge, however, there are no available data on horseweed pollen production, dispersion, and deposition relative to gene flow and the evolution of resistance. to help fill this knowledge gap, a 43-day fiel ...201526257877
physiological responses and tolerance mechanisms to cadmium in conyza canadensis.experiments were conducted to examine the effects of different concentrations of cd on the performance of the cd accumulator conyza canadensis. cd accumulation in roots and leaves (roots>leaves) increased with increasing cd concentration in soil. high cd concentration inhibited plant growth, increased the membrane permeability of leaves, and caused a significant decline in plant height and chlorophyll [chlorophyll (chl) a, chl b, and total chl] content. leaf ultrastructural analysis of spongy me ...201525397987
de novo genome assembly of the economically important weed horseweed using integrated data from multiple sequencing platforms.horseweed (conyza canadensis), a member of the compositae (asteraceae) family, was the first broadleaf weed to evolve resistance to glyphosate. horseweed, one of the most problematic weeds in the world, is a true diploid (2n = 2x = 18), with the smallest genome of any known agricultural weed (335 mb). thus, it is an appropriate candidate to help us understand the genetic and genomic bases of weediness. we undertook a draft de novo genome assembly of horseweed by combining data from multiple sequ ...201425209985
in vivo ³¹p-nuclear magnetic resonance studies of glyphosate uptake, vacuolar sequestration, and tonoplast pump activity in glyphosate-resistant horseweed.horseweed (conyza canadensis) is considered a significant glyphosate-resistant (gr) weed in agriculture, spreading to 21 states in the united states and now found globally on five continents. this laboratory previously reported rapid vacuolar sequestration of glyphosate as the mechanism of resistance in gr horseweed. the observation of vacuole sequestration is consistent with the existence of a tonoplast-bound transporter. (31)p-nuclear magnetic resonance experiments performed in vivo with gr ho ...201425185124
arbuscular mycorrhizal fungal mediation of plant-plant interactions in a marshland plant community.obligate aerobic amf taxa have high species richness under waterlogged conditions, but their ecological role remains unclear. here we focused on am fungal mediation of plant interactions in a marshland plant community. five cooccurring plant species were chosen for a neighbor removal experiment in which benomyl was used to suppress amf colonization. a phragmites australis removal experiment was also performed to study its role in promoting amf colonization by increasing rhizosphere oxygen concen ...201424693254
physiological and transcriptional responses of baccharis halimifolia to the explosive "composition b" (rdx/tnt) in amended soil.unexploded explosives that include royal demolition explosive (rdx) and trinitrotoluene (tnt) cause environmental concerns for surrounding ecosystems. baccharis halimifolia is a plant species in the sunflower family that grows naturally near munitions sites on contaminated soils, indicating that it might have tolerance to explosives. b. halimifolia plants were grown on 100, 300, and 750 mg kg(-1) of soil amended with composition b (comp b) explosive, a mixture of royal demolition explosive and t ...201424687782
classification and identification of metal-accumulating plant species by cluster analysis.identification and classification of metal-accumulating plant species is essential for phytoextraction. cluster analysis is used for classifying individuals based on measured characteristics. in this study, classification of plant species for metal accumulation was conducted using cluster analysis based on a practical survey. forty plant samples belonging to 21 species were collected from an ancient silver-mining site. five groups such as hyperaccumulator, potential hyperaccumulator, accumulator ...201424888623
conyzicola lurida gen. nov., sp. nov., isolated from the root of conyza canadensis.a novel gram-stain-positive, non-spore-forming, pale yellow, irregular rod-shaped bacterium designated strain hwe2-01(t) was isolated from the surface-sterilized root of horseweed (conyza canadensis). phylogenetic analysis based on 16s rrna gene sequences revealed that strain hwe2-01(t) belongs to the family microbacteriaceae and showed sequence similarity levels of 97.1-97.7% with species of the genus salinibacterium, 95.9-97.6% with species of the genus leifsonia and 97.1% with homoserinimonas ...201424860113
conyza canadensis suppresses plant diversity in its nonnative ranges but not at home: a transcontinental comparison.the impact of invasive species across their native and nonnative ranges is poorly quantified and this impedes a complete understanding of biological invasions. we compared the impact of the native north american plant, conyza canadensis, which is invasive to eurasia, on species richness at home and in a number of introduced regions through well replicated transcontinental field studies, glasshouse experiments and individual-based models. our results demonstrated mostly negative relationships bet ...201424548283
global perspective of herbicide-resistant weeds.two hundred and twenty weed species have evolved resistance to one or more herbicides, and there are now 404 unique cases (species × site of action) of herbicide-resistant weeds globally. als inhibitor-resistant weeds account for about a third of all cases (133/404) and are particularly troublesome in rice and cereals. although 71 weed species have been identified with triazine resistance, their importance has dwindled with the shift towards roundup ready® crops in the usa and the reduction of t ...201424302673
conyzagenin-a and b, two new epimeric lanostane triterpenoids from conyza canadensis.two new epimeric lanostane triterpenoids conyzagenin-a and conyzagenin-b were isolated from roots of conyza canadensis, along with nine known compounds. the structures of these triterpenoids were elucidated by detailed spectral methods and chemical derivatisation.201322775203
[photosynthetic characteristics of an invasive plant conyza canadensis and its associated plants].to explore the invasion mechanisms of conyza canadensis and develop effective control measures, this paper studied the photosynthetic characteristics of the invasive plant and its main associated plants ixeris chinensis and commelina communis. the light saturation point and light compensation point of c. canadensis were 1634.00 and 23.84 micromol x m(-2) x s(-1), respectively, which were between those of the two associated plants. the maximum net photosynthetic rate of c. canadensis below light ...201323717992
nocardioides endophyticus sp. nov. and nocardioides conyzicola sp. nov., isolated from herbaceous plant roots.two gram-stain-positive, non-motile, non-spore-forming, rod-shaped actinobacterial strains were isolated from the surface-sterilized roots of mugwort (artemisia princeps) and horse-weed (conyza canadensis), and subjected to taxonomic characterization. 16s rrna gene sequence analysis indicated that the isolates, designated mwe 3-5(t) and hwe 2-02(t), should be placed in the genus nocardioides of the family nocardioidaceae. the strains were closely related to nocardioides hankookensis ds-30(t), wh ...201323990649
paraquat resistance of weeds--the case of conyza canadensis (l.) cronq.the paper gives an overview of literature on paraquat resistance of weeds and the proposed mechanism of resistance. new results we achieved on horseweed (conyza canadensis /l./, cronq.) are discussed in detail. it was demonstrated that there is no significant constitutive difference related to the paraquat resistance between untreated susceptible and paraquat-resistant horseweed plants. the lower sensitivity of flowering resistant plants may be due to the fact that paraquat content in treated le ...201311421444
vacuolar glyphosate-sequestration correlates with glyphosate resistance in ryegrass (lolium spp.) from australia, south america, and europe: a 31p nmr investigation.lolium spp., ryegrass, variants from australia, brazil, chile, and italy showing differing levels of glyphosate resistance were examined by (31)p nmr. extents of glyphosate (i) resistance (ld(50)), (ii) inhibition of 5-enopyruvyl-shikimate-3-phosphate synthase (epsps) activity (ic(50)), and (iii) translocation were quantified for glyphosate-resistant (gr) and glyphosate-sensitive (gs) lolium multiflorum lam. variants from chile and brazil. for comparison, ld(50) and ic(50) data for lolium rigidu ...201222224711
chemical composition and herbicidal activity of the essential oil from a cistus ladanifer l. population from spain.the essential oil composition of cistus ladanifer grown in central spain was analysed by gas chromatography and gas chromatography/mass spectrometry, revealing it to be rich in oxygenated compounds, with trans-pinocarveol (20.00%), bornyl acetate (7.03%) and terpinen-4-ol (6.37%) as the main monoterpene compounds. viridiflorol (13.59%) and ledol (4.36%) were the main constituents of the oxygenated sesquiterpene fraction. large amounts of α-pinene (4.70%) were found in the hydrocarbonated fractio ...201222007862
antifungal activity and composition of essential oils of conyza canadensis herbs and roots.essential oils from herbs and roots of conyza canadensis (horseweed), collected in hungary, were obtained by hydrodistillation. the chemical compositions of the oils were analysed by combination of gc and gc/ms. the major constituent of the oil obtained from the aerial parts of horseweed was limonene (78%), while the main component of root oil was 2z,8z-matricaria ester. the antimicrobial activities of the oils were tested on gram-positive (enterococcus faecalis, staphylococcus aureus, and strep ...201223049473
two non-target mechanisms are involved in glyphosate-resistant horseweed (conyza canadensis l. cronq.) biotypes.the physiological and biochemical bases for glyphosate resistance and susceptibility in horseweed (conyza canadensis l. cronq.) populations collected from córdoba, huelva, málaga, jaén and seville in southern spain were investigated. screening 25 populations treated with glyphosate (238gacidequivalentha(-1)) at the rosette stage (bbch 14-15) revealed reductions in fresh weight (fw) of 9-99%. the resistant biotype (r c004) was 6.1 times more resistant than the susceptible biotype (s). shikimate a ...201222841626
bioassay-directed isolation and identification of phytotoxic and fungitoxic acetylenes from conyza canadensis.conyza canadensis (l.) cronquist syn. (horseweed) is a problematic and invasive weed with reported allelopathic properties. to identify the phytotoxic constituents of the aerial parts, a systematic bioactivity-guided fractionation of the dichloromethane extract was performed. three active enyne derivatives, (2z,8z)-matricaria acid methyl ester, (4z,8z)-matricaria lactone, and (4z)-lachnophyllum lactone, were identified. the lactones inhibited growth of the monocot agrostis stolonifera (bentgrass ...201222612410
glyphosate-resistant horseweed made sensitive to glyphosate: low-temperature suppression of glyphosate vacuolar sequestration revealed by 31p nmr.horseweed has been the most invasive glyphosate-resistant (gr) weed, spreading to 16 states in the united states and found on five continents. the authors have previously reported that gr horseweed employs rapid vacuolar sequestration of glyphosate, presumably via a tonoplast transporter, substantively to reduce cytosolic glyphosate concentrations.1 it was hypothesized that glyphosate sequestration was the herbicide resistance mechanism. if resistance is indeed endowed by glyphosate sequestratio ...201121495156
antimicrobial activities of conyzolide and conyzoflavone from conyza canadensis.antibacterial and antifungal activities of the two isolated compounds from conyza canadensis have been reported in the current study. the two isolated compounds i.e. conyzolide (1) and conyzoflavone (2) were tested against six bacterial and five fungal strains, employing hole diffusion and macrodilution methods. both the compounds showed significant activities against the tested pathogens with special reference to e. coli, p. aeruginosa, s. aureus, trichophytom longifusus, c. albicans, and c. gl ...201121054146
antiproliferative constituents of the roots of conyza canadensis.bioassay-guided fractionation of the n-hexane and chcl3 phases of the methanol extract of the roots of conyza canadensis (l.) cronquist led to the isolation of two new dihydropyranones named conyzapyranone a (1) and b (2), and the known 4 z,8 z-matricaria- ?-lactone (3), 4 e,8 z-matricaria- ?-lactone (4), 9,12,13-trihydroxy-10(e)-octadecenoic acid (5), epifriedelanol (6), friedeline (7), taraxerol (8), simiarenol (9), spinasterol (10), stigmasterol, ß-sitosterol, and apigenin. the structures wer ...201121294076
cross-resistance of horseweed (conyza canadensis) populations with three different als mutations.horseweed is a weed commonly found in agronomic crops, waste areas and roadsides. resistance to als-inhibiting herbicides in horseweed was first reported in 1993 in a population from israel. resistance to als-inhibiting herbicides in horseweed is now widespread, but, as of now, the resistance mechanism has not been reported.201121538801
[studies on the chemical constituents from conyza canadensis].to study the chemical constituents of conyza canadensis.201121954558
differential susceptibility to glyphosate among the conyza weed species in spain.greenhouse and laboratory experiments were conducted to investigate differences in glyphosate susceptibility among three species of the genus conyza introduced as weeds in spain: tall fleabane (conyza sumatrensis), hairy fleabane (conyza bonariensis), and horseweed (conyza canadensis). plant material was obtained from seeds collected in weed populations growing in olive groves and citrus orchards in southern spain, with no previous history of glyphosate application. dose-response curves displaye ...201020225860
the effect of polyphenolic-polysaccharide conjugates from selected medicinal plants of asteraceae family on the peroxynitrite-induced changes in blood platelet proteins.lots of plants belonging to asteraceae family are very popular in folk medicine in poland. these plants are also known as being rich in acidic polysaccharides, due to the presence of hexuronic acids or its derivatives. our preliminary experiments have shown that the extract from conyza canadensis l. possesses various biological activity, including antiplatelet, antiocoagulant and antioxidant properties. the aim of our study was to assess if macromolecular glycoconjugates from selected herbal pla ...201020869393
agricultural impacts of glyphosate-resistant soybean cultivation in south america.in the 2009/2010 growing season, brazil was the second largest world soybean producer, followed by argentina. glyphosate-resistant soybeans (grs) are being cultivated in most of the soybean area in south america. overall, the grs system is beneficial to the environment when compared to conventional soybean. grs resulted in a significant shift toward no-tillage practices in brazil and argentina, but weed resistance may reduce this trend. probably the highest agricultural risk in adopting grs in b ...201020839871
phenylpropanoyl esters from horseweed (conyza canadensis) and their inhibitory effects on catecholamine secretion.three unique phenylpropanoyl 2,7-anhydro-3-deoxy-2-octulosonic acid derivatives were isolated from conyza canadensis (horseweed). their structures were defined as rel-(1s,2r,3r,5s,7r)-methyl 7-caffeoyloxymethyl-2-hydroxy-3-feruloyloxy-6,8-dioxabicyclo[3.2.1]octane-5-carboxylate (1), rel-(1s,2r,3r,5s,7r)-methyl 7-feruloyloxymethyl-2-hydroxy-3-feruloyloxy-6,8-dioxabicyclo[3.2.1]octane-5-carboxylate (2), and rel-(1r,2r,3r,5s,7r)-methyl 7-feruloyloxymethyl-2-feruloyloxy-3-hydroxy-6,8-dioxabicyclo[3. ...201020121251
characterization of the horseweed (conyza canadensis) transcriptome using gs-flx 454 pyrosequencing and its application for expression analysis of candidate non-target herbicide resistance genes.the de novo transcriptome sequencing of a weedy plant using gs-flx 454 technologies is reported. horseweed (conyza canadensis l.) was the first broadleaf weed to evolve glyphosate resistance in agriculture, and also is the most widely distributed glyphosate-resistant weed in the united states and the world. however, available sequence data for this species are scant. the transcriptomic sequence should be useful for gene discovery, and to help elucidate the non-target-based glyphosate resistance ...201020715018
rapid vacuolar sequestration: the horseweed glyphosate resistance mechanism.glyphosate-resistant (gr) weed species are now found with increasing frequency and threaten the critically important glyphosate weed-management system [corrected].201020063320
novel software package for cross-platform transcriptome analysis (cptra).next-generation sequencing techniques enable several novel transcriptome profiling approaches. recent studies indicated that digital gene expression profiling based on short sequence tags has superior performance as compared to other transcriptome analysis platforms including microarrays. however, the transcriptomic analysis with tag-based methods often depends on available genome sequence. the use of tag-based methods in species without genome sequence should be complemented by other methods su ...200919811681
horseweed with reduced susceptibility to glyphosate found in the czech republic.the physiological and molecular basis of apparent resistance to glyphosate in horseweed (conyza canadensis l. cronq.) plants that had survived being sprayed with the herbicide at prague-bubny railway station in the czech republic was investigated. for the sake of comparison, plants expected to be susceptible were collected in areas where no herbicides had been used. plants of both sets were treated, at the rosette stage (10-25 leaves, diameter of 3-5 cm), with herbicide at the rate recommended f ...200919722578
permanent genetic resources added to molecular ecology resources database 1 january 2009-30 april 2009.this article documents the addition of 283 microsatellite marker loci to the molecular ecology resources database. loci were developed for the following species: agalinis acuta; ambrosia artemisiifolia; berula erecta; casuarius casuarius; cercospora zeae-maydis; chorthippus parallelus; conyza canadensis; cotesia sesamiae; epinephelus acanthistius; ficedula hypoleuca; grindelia hirsutula; guadua angustifolia; leucadendron rubrum; maritrema novaezealandensis; meretrix meretrix; nilaparvata lugens; ...200921564911
[effects of soil factors on vegetation community structure in an abandoned subtropical paddy wetland].based on the investigation data from a subtropical wetland having been abandoned from paddy agriculture for one year, a redundancy analysis was conducted on the relationships between vegetation community and soil factors in the wetland. it was found that soil moisture regime, available k and p, and ph were the main factors affecting the distribution of plant species. the common plant species could be classified into three groups, i. e., ludwigia prostrata - murdannia triquetra group (g1), hemart ...200919899449
identification of a cd accumulator conyza canadensis.one of key steps of phytoremediating heavy metal contaminated soils is still the identification of hyperaccumulator and accumulator. in a former published article, conyza canadensis l. cronq. expressed some basic properties of cd-hyperaccumulators. in this study, concentration gradient experiment and two sample-analyzing experiments were used to identify whether this plant is a cd-hyperaccumulator. when grown on soil spiked with cd at the rate of 10 and 25 mg kg(-1) in concentration gradient exp ...200918653276
hyperaccumulative property comparison of 24 weed species to heavy metals using a pot culture experiment.the screening of hyperaccumulators is still very much needed for phytoremediation. with properties such as strong tolerance to adverse environment, fast growing and highly reproductive rate, weed species may be an ideal plant for phytoremediation. the objectives of this study were to examine the tolerance and hyperaccumulative characteristics of 24 species in 9 families to cd, pb, cu and zn by using the outdoor pot-culture experiment. in the screening experiment, only conyza canadensis and rorip ...200918483772
resistance to glyphosate from altered herbicide translocation patterns.glyphosate-resistant weeds have evolved as a result of the intensive use of glyphosate for weed control. an alteration in the way glyphosate is translocated within the plant has been identified as a mechanism of glyphosate resistance in populations of lolium rigidum gaud., l. multiflorum lam. and conyza canadensis (l.) cronq. in these resistant plants, glyphosate becomes concentrated in the leaves rather than being translocating throughout the plant. this type of resistance is inherited as a sin ...200818080284
weed species shifts in glyphosate-resistant crops.the adoption of glyphosate-based crop production systems has been one of the most important revolutions in the history of agriculture. changes in weed communities owing to species that do not respond to current glyphosate-based management tactics are rapidly increasing. clearly, glyphosate-resistant crops (grcs) do not influence weeds any more than non-transgenic crops. for most crops, the trait itself is essentially benign in the environment. rather, the weed control tactics imposed by growers ...200818232055
host plants of the tarnished plant bug (heteroptera: miridae) in central texas.the tarnished plant bug, lygus lineolaris (palisot de beauvois), has taken on added importance as a pest of cotton in the cotton belt after successful eradication efforts for the boll weevil (anthonomus grandis grandis boheman). because the southern blacklands region of central texas is in advanced stages of boll weevil eradication, blooming weeds and selected row crops were sampled during a 3-yr study to determine lygus species composition and associated temporal host plants. l. lineolaris was ...200717716463
effects of the extract from conyza canadensis on human blood platelet aggregation.the effects of different parts of extract from medicinal plant conyza canadensis, used to control bleeding, on human blood platelet aggregation in vitro were investigated. aqueous extract of conyza c. from young or old plants, glycoconjugate part, polysaccharide part and aglycon part at the concentrations above 0.75 mg/ml strongly inhibited platelet aggregation induced by collagen (2 microg/ml) in dose-dependent manner. polysaccharide part isolated from plant extract had the strongest inhibitory ...200717660590
review of potential environmental impacts of transgenic glyphosate-resistant soybean in brazil.transgenic glyphosate-resistant soybeans (grs) have been commercialized and grown extensively in the western hemisphere, including brazil. worldwide, several studies have shown that previous and potential effects of glyphosate on contamination of soil, water, and air are minimal, compared to those caused by the herbicides that they replace when grs are adopted. in the usa and argentina, the advent of glyphosate-resistant soybeans resulted in a significant shift to reduced- and no-tillage practic ...200717562462
transfer of glyphosate resistance: evidence of hybridization in conyza (asteraceae).transfer of herbicide resistance genes between crops and weeds is relatively well documented; however, far less information exists for weed-to-weed interactions. the hybridization between the weedy diploids conyza canadensis (2n = 18) and c. ramosissima (2n = 18) was investigated by monitoring transmission of the allele conferring resistance to n-phosphonomethyl glycine (glyphosate). in a multivariate quantitative trait analysis, we described the phylogenic relationship of the plants, whereas we ...200721636434
transformation and segregation of gfp fluorescence and glyphosate resistance in horseweed (conyza canadensis) hybrids.the goal of this research was to generate a breeding population of horseweed segregating for glyphosate resistance. in order to generate a marker to select between hybrids of glyphosate resistant (gr) and glyphosate susceptible (gs) horseweed, a gr horseweed accession from western tennessee was transformed with a green fluorescent protein (gfp) transgene. the gfp marker allowed for the simple and accurate determination of gr hybrid plants by visual observation. gr plants were shown to be transge ...200717024451
a new c-10 acetylene and a new triterpenoid from conyza canadensis.from the whole plants of conyza canadensis (compositae), a new c-10 acetylene, namely 8r, 9r-dihydroxymatricarine methyl ester (1), and a new triterpenoid, namely 3beta, 16beta, 20beta-trihydroxytaraxast-3-o-palmitoxyl ester (4), were isolated along with eleven known compounds (2, 3, 5-13). the structures of all 13 compounds were elucidated on the basis of their spectral data. the antibacterial activities of compounds 1-3 were evaluated.200717615671
antioxidant and antiaggregatory effects of an extract from conyza canadensis on blood platelets in vitro.the antioxidative activity of the polysaccharide extract from conyza canadensis in blood platelets treated with peroxynitrite (onoo-) was studied. peroxynitrite as a strong biological oxidant has toxic effects on blood platelets and induces the oxidation of thiols, carbonylation and nitration of platelet proteins and lipid peroxidation. therefore, the aim of our study was to assess if the natural extract from herbal plant, conyza canadensis, may protect platelet proteins against nitrative and ox ...200616973495
ferritin2 gene in paraquat-susceptible and resistant biotypes of horseweed conyza canadensis (l.) cronq.ferritins, the multimeric iron storage proteins, are the main regulators of the cellular level of uncomplexed iron. ferritins are encoded by small gene families and expressed differentially under various developmental conditions depending on iron availability, effect of hormones or oxygen radical generating agents. in the present work the primary structure of the ferritin2 gene from resistant and susceptible biotypes of horseweed conyza canadensis was determined. this gene was found to exhibit g ...200616949961
tissue culture and transient transformation of marestail (conyza canadensis (l.) cronquist).glyphosate resistant crops are useful to agriculture by facilitating the use of nonselective herbicides, such as roundup, that have low human and environmental toxicity. the occurrence of glyphosate resistant weeds, however, has raised concern about the future utility of these crops. conyza canadensis (l.) cronquist (marestail or horseweed) is one such glyphosate resistant weed that has yet to be fully analyzed or established in tissue culture. tissue culture enables the examination of physiolog ...200616418861
[absorption and accumulation of heavy metals by plants around a smelter].the study on the absorption and accumulation of heavy metals lead, zinc, copper and cadmium by 8 plant species around a smelter showed that the metals accumulation by plants differed with plant species, their parts, and kinds of metals. abutilon theophrasti had a higher capability of absorbing and accumulating pb, conyza canadensis, ambrosia trifida, polygonumn lapathifolium, a. theophrasti, solanum nigrum, chenopodium acuminatum and helianthus tuberosus had a higher capability of absorbing and ...200616724753
[photosynthetic characteristics and coenological survey of lactuca serriola in its invaded area].lactuca serriola, a national class quarantine object, is a new invasive species in the coastal area of southeast china. the coenological survey showed that because of its big individual, l. serriola could easily form dominant population in its invaded area, and its main accompany species were conyza canadensis, c. bonarinisis, bidentis bipinnata, oenothera laciniata, ipomoea hederacea, setaria viridis, daucus carota, xanthium sibiricum, erigeron annuus, l. indica, humulus scandens, solanum nigru ...200617330472
'candidatus phytoplasma graminis' and 'candidatus phytoplasma caricae', two novel phytoplasmas associated with diseases of sugarcane, weeds and papaya in cuba.during 2003, surveys of sugarcane yellow leaf disease and papaya bunchy top-like disease were carried out on plantations in havana province, cuba, to determine the roles of weeds and auchenorrhyncha insects in the epidemiology of these diseases. more than 250 plant and insect samples were collected and indexed by using a nested pcr for phytoplasma 16s rdna with the generic primer pairs p1/p7 and r16f2n/r16r2. the pcr products were further characterized by restriction fragment length polymorphism ...200516280510
[responses of conyza canadensis to different concentrations of copper in soil].through pot experiment and physiological-biochemical analysis, the study showed that the electric conductivities of conyza canadensis collected from heavy cu pollution (i), light cu pollution (ii) and control (iii) sites were enhanced, while the chlorophyll (a + b) contents were reduced with increasing cu concentration. the protein and proline contents in i were increased at first and then reduced, but those in ii and iii were reduced with increasing cu concentration. the activities of sod, pod ...200516011164
herbicide-resistant crops and weed resistance to herbicides.the adoption of genetically modified (gm) crops has increased dramatically during the last 3 years, and currently over 52 million hectares of gm crops are planted world-wide. approximately 41 million hectares of gm crops planted are herbicide-resistant crops, which includes an estimated 33.3 million hectares of herbicide-resistant soybean. herbicide-resistant maize, canola, cotton and soybean accounted for 77% of the gm crop hectares in 2001. however, sugarbeet, wheat, and as many as 14 other cr ...200515668920
potential of weed species applied to remediation of soils contaminated with heavy metals.to screen out a series of ideal plants that can effectively remedy contaminated soils by heavy metals is the main groundwork of phytoremediation engineering and the first step of its commercial application on a large scale. in this study, accumulation and endurance of 45 weed species in 16 families from an agricultural site were in situ examined by using the pot-culture field experiment, and the remediation potential of some weed species with high accumulation of heavy metals was assayed. the re ...200415559831
inheritance of evolved glyphosate resistance in conyza canadensis (l.) cronq.n-(phosphonomethyl)glycine (glyphosate) resistance was previously reported in a horseweed [conyza (=erigeron) canadensis (l.) cronq.] population from houston, de (p (0) (r) ). recurrent selection was performed on p (0) (r) , since the population was composed of susceptible (5%) and resistant (95%) phenotypes. after two cycles of selection at 2.0 kg ae glyphosate ha(-1), similar glyphosate rates that reduced plant growth by 50%, glyphosate rates that inflicted 50% mortality in the population, and ...200415502914
response of selected horseweed (conyza canadensis (l.) cronq.) populations to glyphosate.horseweed (conyza canadensis (l.) cronq.) seed was collected in illinois, indiana, kentucky, mississippi, missouri, and ohio to determine susceptibility of different horseweed biotypes to glyphosate. horseweed resistant to glyphosate was found in mississippi, ohio, and western tennessee. in a separate experiment examining tennessee biotypes, a dose response curve demonstrated that four times as much glyphosate was needed to achieve a 50% fresh weight reduction (gr(50)) in resistant biotypes when ...200414969545
a review of physiological and biochemical aspects of resistance to atrazine and paraquat in hungarian weeds.the most important results in the field of atrazine and paraquat resistance research by hungarian researchers are reviewed. pleiotropic effects accompanying atrazine resistance were investigated in atrazine-resistant (ar) and susceptible (s) biotypes of horseweed (conyza canadensis (l) cronq). no significant difference in carbon dioxide assimilation rate was found between the ar and s plants. the rates of the hill reaction of the ar and s chloroplasts exhibited different temperature dependence. ...200312701707
shikimate accumulates in both glyphosate-sensitive and glyphosate-resistant horseweed (conyza canadensis l. cronq.).horseweed (conyza canadensis) is a cosmopolitan weed that commonly grows throughout north america. horseweed that is not completely controlled by normal applications of glyphosate has been reported in western tennessee. this research had three objectives: (1) to develop and validate an analytical procedure for the quantitative determination of shikimate, an important indicator of glyphosate activity in plants; (2) to confirm resistance to glyphosate in a horseweed population; and (3) to examine ...200312537441
role of reactive oxygen species and antioxidants in plant disease resistance.membrane damage caused by the non-specific fungal toxin fusaric acid was less on pretreated than on control leaves when tobacco leaves were pretreated with anti-senescence plant hormones, such as kinetin, benzyladenine or the anti-ozonant n-[2-(2-oxo-1-imidazolidinyl)]ethyl-n'-phenylurea. similarly, the necrosis caused by mercuric chloride was reduced by the above anti-senescence agents. in addition, in in vitro tests, leaves from selected paraquat-tolerant tobacco plants were less sensitive to ...200312701708
novel sphingolipids from conyza canadensis.new sphingolipids, 1,3,5-trihydroxy-2-hexadecanoylamino-(6e,9e)-heptacosdiene (1). 1,3,5-trihydroxy-2-hexadecanoylamino-(6e,9e)-heptacosdiene-1-o-glucopyranoside (2). 1,3-dihydroxy-2-hexanoylamino-(4e)-heptadecene (3). have been isolated from conyza canadensis, along with five known compounds, p-hydroxybenzoic acid, 3,5-dihydroxybenzoic acid, 3,5-dimethoxybenzoic acid, 3beta-hydroxyolean-12-en-28-oic acid, and 3beta-erythrodiol, isolated for the first time from this species. their structures wer ...200212499589
sphingolipids from conyza canadensis.sphingolipid 1 and its corresponding beta-d-glucopyranoside derivative 2 have been isolated from the ethylacetate fraction of conyza canadensis along with beta-sitosterol 3, stigmasterol 4, beta-sitosterol 3-o-beta-d-glucoside 5 and harmine 6, reported for the first time from this species. the structures of 1 and 2 were elucidated through spectroscopy including two-dimensional nmr.200212453535
estimation of base temperatures for nine weed species.experiments were conducted to test several methods for estimating low temperature thresholds for seed germination. temperature responses of nine weeds common in annual agroecosystems were assessed in temperature gradient experiments. species included summer annuals (amaranthus albus, a. palmeri, digitaria sanguinalis, echinochloa crus-galli, portulaca oleracea, and setaria glauca), winter annuals (hirschfeldia incana and sonchus oleraceus), and conyza canadensis, which is classified as a summer ...200010938833
antiinflammatory activity of conyza canadensis. 198617345394
anti-inflammatory activity of extracts from conyza canadensis.the petroleum ether and ethanolic extract from the epigean part of conyza canadensis exhibits a significant anti-inflammatory effect on rats with a carrageenin and formalin oedema. eight sesquiterpenic hydrocarbons with the highest anti-inflammatory activity were found in the petroleum ether fraction (beta-santalene, beta-himachalene, cuparene, alpha-curcumene, gamma-cadinene and three other unidentified hydrocarbons). of these substances, beta-himachalene was further studied and its anti-inflam ...19863725873
Refresh
firstprev
1
nextlast
Displaying items 1 - 78 of 78