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Influence of Intergenotypic Competition on Seed Yield of Heterogeneous Soybean Lines 1
Author(s) -
Gedge D. L.,
Fehr W. R.,
Cox D. F.
Publication year - 1978
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/cropsci1978.0011183x001800020010x
Subject(s) - biology , yield (engineering) , competition (biology) , glycine , line (geometry) , zoology , agronomy , horticulture , veterinary medicine , mathematics , ecology , physics , genetics , medicine , amino acid , geometry , thermodynamics
Two experiments were conducted to determine if overcompensation or undercompensation due to intergenotypic competition is preferentially associated with high or low‐yielding heterogeneous soybean ( Glycine max (L.) Merrill) lines. In Experiment 1, yield of 40 random F 2 ‐derived lines, four F 5 ‐derived lines from each F 2 line, and a blend of the four F 5 lines (F 5 blend) were evaluated for two crosses. Linear regression was used to compare the yield of the F 2 lines and F 5 blends with the mean yield of the four F 5 lines. In Experiment 2, four F 5 ‐derived lines were selected from each of six high and six low‐yielding F 2 ‐derived lines in the two crosses. The four F 5 lines were evaluated for yield in pure stands, in the six possible two‐component blends, and in a four‐component blend. Yields of the blends were compared with average performance of the components in pure stands. In both experiments, overcompensation or undercompensation was not preferentially associated with high or low‐yielding heterogeneous lines. The results indicated that early generation testing for yield in soybeans should not be biased significantly by intergenotypic competition within heterogeneous lines.