| cloning and characterization of the ribosomal protein genes in the spc operon of a prokaryotic endosymbiont of the pea aphid, acyrthosiphon kondoi. | to correlate a prokaryotic endosymbiont in the pea aphid, acyrthosiphon kondoi, with the endosymbionts in related aphid species as well as with free-living bacteria and subcellular organelles, and to study the mode of its gene expression within aphid cells, we have cloned and characterized the genes encoding ribosomal proteins s3, l16, l29, s17, l14, l24, l5, s14, s8, l6, l18, s5, l30, l15 and secretion protein y (sec y) from the s10 and spc ribosomal protein gene operons of this endosymbiont. t ... | 1994 | 7584036 |
| the effect of predators and hymenopterous parasites on population fluctuations of alfalfa aphids. | among alfalfa pests in iran three aphid species, green alfalfa aphid acyrthosiphon pisum harris spotted alfalfa aphid therioaphis trifolii forma maculata buckton and blue alfalfa aphid, acyrthosiphon kondoi shinji are important pests. the green alfalfa aphid can be observed all along the growing season particularly from late may to mid june at karaj climate conditions. during this period, the mean monthly maximum temperature and relative humidity were about 28 degrees c and 60-65% respectively. ... | 2005 | 16628912 |
| [quality of different aphids species as hosts for the parasitoid aphidius ervi haliday (hymenoptera: braconidae: aphidiinae)]. | the suitability of macrosiphum euphorbiae (thomas), aulacorthum solani (kaltenbach) and acyrthosiphon kondoi shinji (hemiptera: aphididae) as hosts for the aphid parasitoid aphidius ervi haliday was evaluated by assessing host size, host preference, and host quality. tests were carried out in an environmental chamber at 22±1ºc, 70±10% rh and 12h photophase. replicates (11) consisted of one 24h-old mated female of a. ervi without a previous oviposition experience. female was released into a petri ... | 2010 | 21120377 |
| Sequence conservation and functional constraint on intergenic spacers in reduced genomes of the obligate symbiont Buchnera. | Analyses of genome reduction in obligate bacterial symbionts typically focus on the removal and retention of protein-coding regions, which are subject to ongoing inactivation and deletion. However, these same forces operate on intergenic spacers (IGSs) and affect their contents, maintenance, and rates of evolution. IGSs comprise both non-coding, non-functional regions, including decaying pseudogenes at varying stages of recognizability, as well as functional elements, such as genes for sRNAs and ... | 2011 | 21912528 |
| identification of potential early regulators of aphid resistance in medicago truncatula via transcription factor expression profiling. | *resistance to aphids has been identified in a number of plant species, yet the molecular mechanisms underlying aphid resistance remain largely unknown. *using high-throughput quantitative real-time pcr technology, the transcription profiles of 752 putative medicago truncatula transcription factor genes were analysed in a pair of susceptible and resistant closely related lines of m. truncatula following 6 and 12 h of bluegreen aphid (acyrthosiphon kondoi) infestation. *eighty-two transcription f ... | 2010 | 20345634 |
| a single gene, ain, in medicago truncatula mediates a hypersensitive response to both bluegreen aphid and pea aphid, but confers resistance only to bluegreen aphid. | biotic stress in plants frequently induces a hypersensitive response (hr). this distinctive reaction has been studied intensively in several pathosystems and has shed light on the biology of defence signalling. compared with microbial pathogens, relatively little is known about the role of the hr in defence against insects. reference genotype a17 of medicago truncatula gaertn., a model legume, responds to aphids of the genus acyrthosiphon with necrotic lesions resembling a hr. in this study, the ... | 2009 | 19690018 |
| characterization of pea aphid resistance in medicago truncatula. | to achieve a thorough understanding of plant-aphid interactions, it is necessary to investigate in detail both the plant and insect side of the interaction. the pea aphid (pa; acyrthosiphon pisum) has been selected by an international consortium as the model species for genetics and genomics studies, and the model legume medicago truncatula is a host of this aphid. in this study, we identified resistance to pa in a m. truncatula line, 'jester', with well-characterized resistance to a closely rel ... | 2008 | 18184733 |
| 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 |
| involvement of the octadecanoid pathway in bluegreen aphid resistance in medicago truncatula. | aphids are major insect pests of plants that feed directly from the phloem. we used the model legume medicago truncatula gaert. (barrel medic) to elucidate host resistance to aphids and identified a single dominant gene which confers resistance to acyrthosiphon kondoi shinji (bluegreen aphid). to understand how this gene conditions resistance to bluegreen aphid, transcription profiling of 23 defense-related genes representing various signaling pathways was undertaken using a pair of near-isogeni ... | 2007 | 17249425 |
| independent action and contrasting phenotypes of resistance genes against spotted alfalfa aphid and bluegreen aphid in medicago truncatula. | host resistance to aphids is poorly understood. medicago truncatula, a model legume and cultivated pasture species, was used to elucidate defense against two aphid species, therioaphis trifolii f. maculata (spotted alfalfa aphid, saa) and acyrthosiphon kondoi (bluegreen aphid, bga). aphid performance and plant damage were compared between near-isogenic cultivars, mogul and borung, that differ in resistance to both aphids. analyses of aphid resistance in mogul x borung f2 plants and their progeny ... | 2007 | 17244058 |
| aphid resistance in medicago truncatula involves antixenosis and phloem-specific, inducible antibiosis, and maps to a single locus flanked by nbs-lrr resistance gene analogs. | aphids and related insects feed from a single cell type in plants: the phloem sieve element. genetic resistance to acyrthosiphon kondoi shinji (bluegreen aphid or blue alfalfa aphid) has been identified in medicago truncatula gaert. (barrel medic) and backcrossed into susceptible cultivars. the status of m. truncatula as a model legume allows an in-depth study of defense against this aphid at physiological, biochemical, and molecular levels. in this study, two closely related resistant and susce ... | 2005 | 15778464 |
| aphids do not avoid resistance in australian lupin (lupinus angustifolius, l. luteus) varieties. | laboratory bioassays and field trials were used to characterize resistance to three aphid species (myzus persicae (sulzer), acyrthosiphon kondoi shinji, aphis craccivora (koch) in two aphid-resistant varieties (kalya, tanjil) and one susceptible variety (tallerack) of lupinus angustifolius l., and in one resistant variety (teo) and one susceptible variety (wodjil) of l. luteus l. host selection tests in the glasshouse showed that alates of all three species preferred l. luteus to l. angustifoliu ... | 2003 | 14641979 |
| influence of alfalfa cultivar on suitability of acyrthosiphon kondoi (homoptera: aphididae) for survival and development of hippodamia convergens and coccinella septempunctata (coleoptera: coccinellidae). | hippodamia convergens guérin-méneville and coccinella septempunctata l. (coleoptera: coccinellidae) larvae were supplied daily with 1, 2, 4, or 16 mg of acyrthosiphon kondoi shinji (homoptera: aphididae) reared on one of two susceptible ('ok08' or 'cuf-101') or one resistant ('54h55') alfalfa cultivar (imedicago sativa l.) . hippodamia convergens survived to the adult stage when supplied with > or = 1 mg of a. kondoi per day from both susceptible and aphid-resistant cultivars, whereas c. septemp ... | 2002 | 12075999 |
| establishing alighting preferences and species transmission differences for pea seed-borne mosaic virus aphid vectors. | pea seed-borne mosaic virus (psbmv) infection causes a serious disease of field pea (pisum sativum) crops worldwide. the psbmv transmission efficiencies of five aphid species previously found landing in south-west australian pea crops in which psbmv was spreading were studied. with plants of susceptible pea cv. kaspa, the transmission efficiencies of aphis craccivora, myzus persicae, acyrthosiphon kondoi and rhopalosiphum padi were 27%, 26%, 6% and 3%, respectively. lipaphis erysimi did not tran ... | 2017 | 28408208 |