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Inheritance of Traits Associated with Grain Yield in a Spring Oat Diallel
Author(s) -
Kolb F. L.,
Marshall H. G.,
Hill R. R.
Publication year - 1990
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1990.0011183x003000050014x
Subject(s) - diallel cross , biology , avena , test weight , agronomy , tiller (botany) , additive genetic effects , grain yield , yield (engineering) , cultivar , heritability , mating design , genetic variability , genotype , hybrid , genetics , gene , materials science , metallurgy
Developing oat ( Avena sativa L.) cultivars with superior grain yield potentials is difficult. Our objectives were to characterize traits associated with high grain yield of elite genotypes and to determine their inheritance and potential value for selection. Three extremely high yield (HY) genotypes (‘Ogle’, ‘Orbit’, and ‘Hazel’) and three moderate yield (MY) genotypes (‘Dal’, PA2250, PA12422) were crossed in diallel combinations. Data were collected on parents and F 2 progenies in the field during 1985 and on parents and F 3 lines in 1986. The HY genotypes were always superior for seed weight and usually superior or equal to the MY genotypes for tiller production, harvest index (HI), and biological yield. In the F 2 , HY progenies were always superior or equal to MY progenies for most traits measured. Additive genetic effects were most important for all traits, and except for tillers/plant, nonadditive effects also were significant. In the F 3 , large, significant additive genetic effects occurred for most traits. Nonadditive effects also were significant for seed weight, grain yield, biological yield, and HI, with an important specific combining‐ability component for the latter three. All significant correlation coefficients between traits of F 2 plants and F 3 ‐derived lines were small, and multiple regression models based on F 2 traits were not useful for predicting F 3 line yields. Since additive genetic effects for yield‐related traits were large, however, some progress should result from early generation selection for those traits.