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GrainGenes Reference Report: JEE-97-654

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Reference	JEE-97-654
Title	Phenotypic mechanisms of host resistance against greenbug (Homoptera : Aphididae revealed by near isoaenic lines of wheat
Journal	Journal of Economic Entomology
Year	2004
Volume	97
Pages	654-660
Author	Weng Y Lazar MD Michels GJ Rudd JC
Abstract	Summary: Interactions between biotype E greenbug, Schizaphis graminum (Rondani), and wheat, Triticum aestivum L., were investigated using resistant and susceptible near isogenic lines of the greenbug resistance gene Gb3. In an antixenosis test, the greenbugs preferred susceptible plants to resistant ones when free choice of hosts was allowed. Aphid feeding resulted in quick and severe damage to susceptible plants, which seemed to follow a general pattern spatially and was affected by the position where the greenbugs were initially placed. Symptom of damage in resistant plants resembled senescence. Within-plant distribution of aphids after infestation was clearly different between the two genotypes. Significantly more greenbugs fed on the first (oldest) leaf than on the stem in resistant plants, but this preference was reversed in the susceptible one. After reaching its peak, aphid population on the susceptible plants dropped quickly. All susceptible plants were dead in 10-14 d after infestation due to greenbug feeding. Aphid population dynamics on resistant plants exhibited a multipeak curve. After the first peak, the greenbug population declined slowly. More than 70% of resistant plants were killed 47 d after infestation. Performance of both biotype E and I greenbugs on several Gb3-related wheat germplasm lines were also examined. It seems that the preference-on-stem that was characteristic of biotype E greenbugs on the susceptible plants was aphid biotype- and host genotype-dependent. Results from this study suggested that antixenosis, antibiosis, and tolerance in the resistant plants of wheat might all contribute to resistance against greenbug feeding
External Databases	Pubmed: 15154495
Keyword	[ Hide all but 1 of 44 ] antibiosis antixenosis aphid aphids apr biotype biotype-e choice control damage dynamics gene germplasm germplasm lines greenbug homoptera host host-resistance hosts infestation isogenic lines its near isogenic lines near-isogenic line oil pattern performance plant resistance population population-dynamics position registration resistance resistance gene resistant schizaphis schizaphis graminum schizaphis-graminum senescence susceptible tolerance triticum triticum aestivum triticum aestivum-l

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