Disease relevance of Aphids

• Trees for ORF1 and repA (based on both nucleotides and amino acids) are used to examine the basis for leu plasmid differences between Buchnera of Thelaxes suberi and Aphididae [1].
• Constitutive activation of jasmonate signaling in an Arabidopsis mutant correlates with enhanced resistance to Erysiphe cichoracearum, Pseudomonas syringae, and Myzus persicae [2].
• Toxicity of [14C] phorate applied systemically to the aphids Myzus persicae (Sulz) and Brevicoryne brassicae (l.) grown on brussels sprout plants [3].

High impact information on Aphids

• Reproduction of two Homoptera, Myzus persicae and Brevicoryne brassicae, was unaffected by myrosinase mutations [4].
• When attacked by a phloem-feeding greenbug aphid (Schizaphis graminum), sorghum (Sorghum bicolor) activates jasmonic acid (JA)- and salicylic acid (SA)-regulated genes, as well as genes outside known wounding and SA signaling pathways [5].
• Polymerase chain reaction-restriction fragment length polymorphism of ribosomal internal transcribed spacer region analysis on polyacrylamide gel electrophoresis reveals two haplotypes coexisting in Myzus persicae [6].
• [(3)H]AzNN binds to a single high-affinity site in Myzus that is competitively inhibited by imidacloprid and nicotine and further characterized as to its pharmacological profile with various nicotinic ligands [7].
• Most populations of the aphid Myzus persicae have amplified genes (up to 80 copies) encoding the insecticide-detoxifying esterase E4 [8].

Chemical compound and disease context of Aphids

• A 8,392-nucleotide-long DNA fragment from Buchnera aphidicola (endosymbiont of the aphid Schizaphis graminum) contained five genes of the tryptophan biosynthetic pathway [trpDC(F)BA] which code for enzymes converting anthranilate to tryptophan [9].
• In all examined species of the family Aphididae, the bacterial endosymbiont Buchnera aphidicola carries a plasmid encoding the genes leuABCD (involved in leucine biosynthesis) along with repA1, repA2 and ORF1 [10].

Biological context of Aphids

• Evidence that the E4 and FE4 esterase genes responsible for insecticide resistance in the aphid Myzus persicae (Sulzer) are part of a gene family [11].
• The unexpected finding of elements of the RepA/C replicon in previously characterized trpEG plasmids from Buchnera of the Aphididae suggests that a replacement of replicons has occurred during the evolution of these plasmids, which may point to a common ancestry for all Buchnera trpEG amplifications [12].
• An amino acid substitution on the second acetylcholinesterase in the pirimicarb-resistant strains of the peach potato aphid, Myzus persicae [13].
• Buchnera aphidicola, the endosymbiont of the aphid Schizaphis graminum, contains the gene ftsZ, which codes for a protein involved in the initiation of septum formation during cell division [14].
• An acetylcholinesterase (AChE, EC 3.1.1.7) cDNA was cloned and characterized from a greenbug (Schizaphis graminum (Rondani)) cDNA library [15].

Anatomical context of Aphids

• Thiamethoxam, a new neonicotinoid insecticide acting at nicotinic acetylcholine receptors, was characterized in competition binding assays with [3-H]-imidacloprid, a specific nicotinic ligand, using membranes from the aphids Aphis craccivora and Myzus persicae, and from the locust Locusta migratoria [16].

Associations of Aphids with chemical compounds

• Cloning and functional characterisation of two novel nicotinic acetylcholine receptor alpha subunits from the insect pest Myzus persicae [17].
• Characterization of acetylcholinesterases, and their genes, from the hemipteran species Myzus persicae (Sulzer), Aphis gossypii (Glover), Bemisia tabaci (Gennadius) and Trialeurodes vaporariorum (Westwood) [18].
• Here, we report that one of these mutations, a leucine-to-phenylalanine replacement in transmembrane segment IIS6, is also found in certain insecticide-resistant clones of the peach-potato aphid, Myzus persicae [19].
• Duplication of the Rdl GABA receptor subunit gene in an insecticide-resistant aphid, Myzus persicae [20].
• Is photosynthetic transcriptional regulation in Triticum aestivum L. cv. 'TugelaDN' a contributing factor for tolerance to Diuraphis noxia (Homoptera: Aphididae) [21]?

Gene context of Aphids

• We are investigating the molecular diversity of insect nAChR subunit genes in an important agricultural pest, the peach-potato aphid Myzus persicae [22].
• Of particular interest is the S431F mutation in ace2 and its orthologue ace1 of Myzus persicae Sulzer and Aphis gossypii Glover, respectively [23].
• Effects of DIMBOA on detoxification enzymes of the aphid Rhopalosiphum padi (Homoptera: aphididae) [24].
• Peroxidase activity was measured in control plants and plants infested with the aphid Schizaphis graminum (Rondani) [25].
• Aspects of energy-yielding metabolism in the aphid, Schizaphis graminum, and its endosymbiont: detection of gene fragments potentially coding for the ATP synthase beta-subunit and glyceraldehyde-3-phosphate dehydrogenase [26].

Analytical, diagnostic and therapeutic context of Aphids

• Comparison of bioassay techniques for determining baseline susceptibilities to imidacloprid for green apple aphid (Homoptera: Aphididae) [27].
• A method has been developed to enable correlative light microscopy (LM) and scanning electron microscopy (SEM) on the same section of wheat (Triticum aestivum L.) leaves infested by greenbug aphids (Schizaphis graminum Rondani) [28].

References