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Genetic Effects for Mean Yield and for Yield Responses to Environments in Three‐Way and Single‐Cross Hybrids of Grain Sorghum 1
Author(s) -
Patanothai Aran,
Atkins R. E.
Publication year - 1974
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/cropsci1974.0011183x001400030044x
Subject(s) - sorghum , hybrid , yield (engineering) , grain yield , epistasis , biology , stability (learning theory) , agronomy , sorghum bicolor , mathematics , crop yield , interaction , statistics , gene , genetics , computer science , materials science , machine learning , metallurgy
Grain yields of three‐way and single‐cross hybrids of sorghum ( Sorghum bicolor L. Moench) were obtained from experiments grown in nine environments in Iowa during 1969 through 1971. The purpose of the study was to obtain, estimates of the relative impact of various types of geneuc effects on mean grain yield and on stability of yield over environments. Analyses of the data indicated that differences among the entries for mean yield were ascribable to both additive and dominant gene effects. Variations among parameters that describe stability of yield over environments could be attributed largely to additive gene action. Significant epistatic effects were not indicated for the expression of either mean yield or stability of yield. A second objective of the study was to compare observed and predicted values for grain yield and yield stability of the three‐way crosses. Relative effectiveness of five prediction methods generally was in accord with significance of the genetic effects included in the prediction equation. The method analagous to Jenkins's Method B (J. Amer. Soc. Agron. 26:199–204, 1926) for predicting the yield of a double cross seemed preferable to the other methods because of its simplicity and its suitability for use with any set of crosses.