Genetic analysis of some polygenic traits in rice

摘要

Parental, F1, F2, BC1 and BC2 generations of seven crosses involving eight rice cultivars were studied for panicle length, number of primary branches/panicle, number of grains/panicle, weight of grains/panicle and 1000-grain weight. A simple three-parameter model was adequate to account for the variability in panicle length, number of primary branches/panicle and weight of grains/panicle in the majority of crosses. Among the digenic interaction models, the six parameter model was found to be adequate to explain the variability for number of grains/panicle and 1000-grain weight in most of the crosses. All the digenic interactions showed duplicate type of epistasis. The predominance of additive gene effects and additive X additive interactions indicated that improvement may be brought about via selection.