Recurrent Selection for Seed Yield in Soybean Populations with Different Percentages of Plants Introduction Parentage

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Date
1996
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Kenya Agricultural Research Institute
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The development of soybean cultivars in North America by hybridization, inbreeding, and selection began in the 1930's (Specht and Williams, 1984). Genetic improvements are responsible for at least 50% of the total soybean yield gains since about 1930 (Duvick, 1984). Almost all cultivars are developed currently by selection for high yield within elite x elite parent crosses. Several workers have reported that the ancestry of North American soybean cultivars traces to only a few parents (Delannay et aI., 1983; Gizlice et al., 1994). Intense selection for yield within a narrow genetic base may have resulted in a decrease in genetic variability that may limit future response to selection (Johnson and Bernard, 1963).
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