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GrainGenes Reference Report: TAG-99-1265

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Reference	TAG-99-1265
Title	Inheritance of resistance to leaf and glume blotch caused by Septoria nodorum Berk. in winter wheat
Journal	Theoretical and Applied Genetics
Year	1999
Volume	99
Pages	1265-1272
Author	Wicki W Winzeler M Schmid JE Stamp P Messmer M
Abstract	Summary: Sixteen crosses between eight winter wheat cultivars were screened for resistance to Septoria nodorum leaf and glume blotch in the F(1) and F(4) generations using artificial inoculation in the field. The F(1) of most crosses showed dominance for susceptibility on both ear and leaf. The effects of general combining ability were of similar magnitude as the effects for specific combining ability. On the basis of the phenotypic difference of the parents, no prediction was possible about the amount and the direction of genetic variance in the segregating populations. The variation observed in this study both within and among the segregating populations suggests a quantitative inheritance pattern influencing the expression of the two traits. The components of variance between F(2) families within a population were as high as (for S. nodorum blotch on the ear) or higher (for S. nodorum blotch on the leaf) than those between populations. Therefore, strong selection within a few populations may be as effective to obtain new resistant genotypes as selection in a large number of populations. In almost all crosses, progenies were found that were more resistant than the better parent. Thus transgression breeding may be a tool to breed for higher levels of resistance to S. nodorum blotch. Highly resistant genotypes were found even in combination with two susceptible parents. The genetic source for Septoria resistance is probably broader than is generally assumed and could be used to improve S. nodorum resistance by combination breeding followed by strong selection in large populations
Keyword	[ Hide all but 1 of 40 ] artificial selection blotch breed breeding combining ability disease resistance dominance family field field experimentation fungal diseases general combining ability generation genetic variance genotype glume blotch glumes heritability heterosis inheritance inheritance of resistance inoculation leptosphaeria nodorum plant breeding population prediction progeny resistance resistant selection septoria nodorum specific combining ability susceptibility tool transgression triticum aestivum variance wheat cultivar winter winter wheat

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