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Transgressive Segregation and the Nature of Gene Action for Yield in an Intervarietal Cross of Upland Cotton 1
Author(s) -
ElAdl A. M.,
Miller P. A.
Publication year - 1971
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/cropsci1971.0011183x001100030021x
Subject(s) - lint , diallel cross , heterosis , biology , hybrid , inbred strain , yield (engineering) , transgressive segregation , population , agronomy , horticulture , genetics , quantitative trait locus , demography , gene , materials science , sociology , metallurgy
Two inbred parental lines, their F 1 , and six inbred lines selected for high yield after three cycles of recurrent selection in this population were evaluated at three locations for two years. The F 2 yielded 32.6% more than the midparent value and exceeded the higher parent by 13.3%. The F 1 also exceeded the midparent values for several components of yield, including lint percentage, weight per boll, number of bolls per plot, lint index, and seed index. The mean yield of the six selected lines exceeded that of the F 1 by 5.5%. Each of the six lines was higher in lint yield and lint percentage than the higher parent of the original cross, which indicated that transgressive segregation for these traits had occurred. Fifteen possible crosses among the six lines were compared with the above entries at three locations in the second year. These hybrids averaged 9.6% higher in yield than the mean of their parents. Significant heterosis was also detected for lint percentage, weight per boll, number of seed per boll, and lint index. Estimates of general combining ability from the set of diallel crosses were significant for all traits except lint percentage, which demonstrated the importance of additive genetic effects for those traits. The variance for specific combining ability was significant only for lint percentage.