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Predicting Yield from Early Generation Estimates of Reproductive Growth periods in Soybean 1
Author(s) -
Smith James R.,
Nelson Randall L.
Publication year - 1987
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/cropsci1987.0011183x002700030009x
Subject(s) - biology , selection (genetic algorithm) , loam , yield (engineering) , zoology , reproduction , genetic gain , agronomy , genetic variation , ecology , soil water , genetics , materials science , artificial intelligence , computer science , metallurgy , gene
Previous research has demonstrated positive relationship between reproductive growth periods and seed yield in soybean [ Glycine max (L.) Merr.]. The purposed of this research was to evaluate predicted response in seed yield by selection for length of reproductive growth periods within early generation segregating populations. Two populations of 131 and 89 F 2 ‐derived lines were developed from crosses between experimental lines selected for differences in seed‐filling period and were tested in the F 3 and F 4 . Single‐rowpl ots wereg rown in a randomized complete blocked design with two replications at Urbana, IL in 1984 and 1985. The soil type each year was a Flanagan silt loam (Aquic Argindolis) Reproductive growth periods were estimated as the difference between specific reproductive growth stages (R1, R4, R5, R7, and R8). Heritabilities were estimated by the regression coefficient of F 4 generation lines on F 3 generation lines. Genotypic correlations were calculated from the same offspring‐parent relationship. Heritabilities and genotypic correlations was were used to predict gain from selection. Heritabilities for most of the reproductive growth periods were not higher than those for yield, and the genotypic correlations between yield and reproductive growth periods were generally small. The predicted gain in seed yield by selection for increases in reproductige growth periods, relative to selection for increases in seedy ield, was low in all cases. Early generation selection for reproductive growth periods was unreliable in identifying high yielding lines.