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GrainGenes Reference Report: PHY-83-1071

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Reference	PHY-83-1071
Title	Components of variation for quantitative adult-plant risistance to powdery mildew in winter rye
Journal	Phytopathology
Year	1993
Volume	83
Pages	1071-1075
Author	Miedaner T Schmidt H Geiger H
Abstract	The genetics of quantitative resistance to powdery mildew (Erysiphe graminis f sp secalis) in winter rye (Secale cereale) was investigated by testing four sets of factorial crosses along with their parental inbred lines (53 crosses, 28 inbred lines in total) at two locations during 1988 and 1989 Genotypes were scored on a 0-9 scale for the percentage of infected leaf area at booting and heading stages on the upper three leaves of 10 randomly chosen main stems per plot Estimates of heritability were high in all materials at both assessment stages (h(2) = 0.65-0.95). High correlations were found among leaves (r = 0.75-0.97; P = 0.01) for all sets and between booting and heading pooled over leaves for three out of four sets (r=0.89-0.98; P=0.01). Significant quantitative variation was observed among crosses and lines. General combining ability (GCA) variances were significant for the males in all sets and for the females in three sets; specific combining ability (SCA) was negligible throughout. Strong GCA-environment interactions were found. Moderate (r = 0.68; P = 0.05) to strong (r = 0.77-0.87; P = 0.01) correlations existed between line and GCA effects. The resistance levels of lines and crosses were similar in two sets, whereas in the third set the inbred lines and in the fourth set the crosses were slightly more resistant. We concluded from the data that considerable progress can be expected from selection for quantitative resistance to powdery mildew in current hybrid rye breeding programs.
Keyword	crosses [ Show all 8 ]

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