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GrainGenes Reference Report: JEE-96-202

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Reference	JEE-96-202
Title	Expression and suppression of resistance to greenbug (Homoptera : Aphididae) in synthetic hexaploid wheats derived from Triticum dicoccum x Aegilops tauschii crosses
Journal	Journal of Economic Entomology
Year	2003
Volume	96
Pages	202-206
Author	Lage J Skovmand B Andersen SB
Abstract	Summary: Fifty-eight synthetic hexaploid wheats, developed by crossing Triticum dicoccum Schrank. and Aegilops tauschii (Coss.) Schmal., were evaluated at the seedling stage, together with their parents, for resistance to greenbug (Schizaphis graminum Rondani) under greenhouse conditions. Seedlings of different synthetic hexaploids showed large phenotypic differences for resistance. All the T. dicoccum parents were susceptible, while high levels of resistance were observed in some of the Ae. tauschii parents. Of the synthetic hexaploids derived from resistant Ae. tauschii parents, a high proportion (76%) showed levels of resistance to the greenbug biotype used that were comparable to those of the resistant parent. While there were clear indications of the presence of suppressor genes for greenbug resistance in the A and/or B genomes of T. dicoccum in some synthetics, positive epistatic interaction was also found in synthetic hexaploids with higher levels of resistance than that of either parent. Resistance from different Ae. tauschii accessions was expressed differently when crossed with the same T. dicoccum, indicating diversity among the resistance genes present in the test synthetic hexaploid wheats. Based on resistance reactions, the genes conferring greenbug resistance in these synthetic hexaploids are probably different from resistance genes previously transferred to wheat from Ae. tauschii
Keyword	[ Hide all but 1 of 30 ] accessions aegilops b genome biotype control crossing cultivar difference diversity gene genetic interaction germplasm lines hexaploid hexaploid wheat homoptera inheritance parents resistance resistance screening resistant schizaphis graminum seedling squarrosa stripe rust suppression synthetic hexaploid synthetic hexaploid wheat tauschii triticum wheat

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