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Estimates of Genetic Effects of Heading Date, Plant Height, and Grain Yield in Durum Wheat 1
Author(s) -
Amaya A. Arnoldo,
Busch R. H.,
Lebsock K. L.
Publication year - 1972
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/cropsci1972.0011183x001200040026x
Subject(s) - biology , heterosis , epistasis , grain yield , hybrid , heading (navigation) , yield (engineering) , agronomy , dominance (genetics) , additive genetic effects , genetic variability , horticulture , heritability , genetics , genotype , gene , materials science , geodesy , metallurgy , geography
A weighted least squares analysis of parental, F 1 , bulk F 2 and F 3 , B 1 C, and B 2 C means was used to estimate genetic effects of plant height, heading date, and grain yield in four crosses of durum wheat ( Triticum durum Desf.). F 3 lines from randomly harvested F 2 plants from each cross were included in replicated tests in three of four environments. The F 1 hybrids exceeded their high‐yielding parents by an average of about 25% in grain yield; expression of heterosis, however, varied widely among the environments. Heterosis was of less magnitude in the expression of plant height and heading date. Dominance genetic effects ĥ were relatively more important than additive effects (d̂) in the inheritance of grain yield. Additive genetic effects predominated in the expression of plant height and heading date. Epistatic effects were detected in some crosses when analyzed in individual environments, but these effects were not detected for grain yield and heading date when data were combined over all environments. Some F 3 lines from all crosses were not significantly different from their corresponding F 1 's in grain yield and more desirable than the F 1 's in heading date (earlier) and plant height (shorter).