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GrainGenes Reference Report: EUP-139-133

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Reference	EUP-139-133
Title	Generation means analysis of wheat streak mosaic virus resistance in winter wheat.
Journal	Euphytica
Year	2004
Volume	139
Pages	133-139
Author	Hakizimana F Ibrahim AMH Langham MAC Rudd JC Haley SD
Abstract	Wheat streak mosaic virus (WSMV; Family: potyviridae ; Genus: Tritimovirus ) is a major threat to winter wheat ( Triticum aestivum L. em. Thell) production worldwide, yet little is known about the genetic control of resistance. Our objective was to determine the mode of inheritance and type of gene action of WSMV resistance in two winter wheat crosses involving a resistant line, 'OK65C93-8', and two susceptible cultivars, 'Tandem' and 'Vista'. For each cross, parents, F SUB 1 , F SUB 2 , and backcross plants were inoculated and evaluated for WSMV resistance in two replicated greenhouse experiments. Generation means analysis indicated that additive, dominance, and epistatic effects were all involved in the inheritance of WSMV resistance. Broad-sense heritability estimates for visual symptom rating and ELISA values were high for both crosses (0.84-0.91). Narrow-sense heritability estimates were low in the Tandem/OK65C93-8 cross (0.43-0.45) and moderate in the Vista/OK65C93-8 cross (0.71-0.74). Due to the presence of greater non-additive gene effects combined with low narrow-sense heritability in the Tandem/OK65C93-8 cross, selecting for WSMV resistance in this cross would be complex if using conventional methods. On the other hand, the significant contribution of additive gene effects combined with moderate narrow-sense heritability in the Vista/OK65C93-8 cross suggested that it could be exploited to select for WSMV resistance. Progress from selection for WSMV resistance in early generations of winter wheat may vary among populations as indicated in this study. Therefore, evaluating genetic control of parental combinations may be warranted prior to selecting for WSMV resistance from this source
Keyword	[ Hide all but 1 of 24 ] additive gene effects backcrosses control crosses cultivars disease resistance dominance elisa epistasis estimates gene genetic control genetic effects heritability inheritance plant diseases plant pathogens plants resistance selection triticum aestivum wheat winter winter wheat

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