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Heritabilities of Grain Yield of Common Bean in Sole Crop and in Intercrop with Maize 1
Author(s) -
Zimmermann Maria J. O.,
Rosielle Arnold A.,
Waines J. Giles
Publication year - 1984
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/cropsci1984.0011183x002400040004x
Subject(s) - heritability , biology , crop , selection (genetic algorithm) , agronomy , phaseolus , cropping system , cropping , intercropping , crop yield , yield (engineering) , mathematics , agriculture , ecology , genetics , materials science , artificial intelligence , computer science , metallurgy
Standard unit heritabilities for grain yield of common bean ( Phaseolus vulgaris L.) were determined for F 2 ‐derived F 4 and F 5 progenies and for F 2 individual plants and their F 3 progenies of three common bean crosses. Standard unit heritabilities were determined by correlating F 2 ‐derived F 4 line grain yields with F 2 ‐derived F 5 line grain yields. Heritabilities were determined for direct selection (F 4 and F 5 lines in the same cropping system) and indirect selection (F 4 and F 5 lines in different cropping systems). Selection gains were also estimated for direct selection, indirect selection, and for selection based on the means of both systems. Parent‐offspring genotypic correlations were determined for the F 2 ‐derived F 4 and F 5 progenies. Standardized correlated responses to selection for grain yield based on selection for harvest index were estimated for F 2 individual plants. Standard unit heritabilities were larger in intercrop than in sole crop. The difference in heritability between cropping systems was larger for F 2 plants than for the F 2 ‐derived F 4 progenies. Direct selection in intercrop and sole crop was always superior to indirect selection in the alternate cropping system. Indirect selection in intercrop for sole crop gave the lowest gains. Direct selection in intercrop or in sole crop gave the highest genetic gains in each respective cropping system. Selection on the mean of both systems gave gains in each system almost as high as those of direct selection. Selection in sole crop for improvement in the mean of both systems resulted in lower gains than selection on the mean of both systems, but was better than selection in intercrop. Standardized correlated responses in grain yield by selection for harvest index were larger in intercrop than in sole crop. Single plant selection for yield may be effective for beans which are intercropped.