Variability studies in segregating populations of rice.

摘要

Genetic parameters were studied in a set of seven parental lines (Vikas, Jaya, Chambal, IR-64, BK-79, IR-36 and Annapurna) and their 21 F2 populations in rice. Observations were recorded for days to flowering, days to maturity, tillers per plant, panicle length, grains per panicle, grain weight per panicle, 100-grain weight and yield per plant. Among the characters studied, grain weight per panicle, yield per plant and grains per panicle had high heritability and genetic advance, suggesting that improvement for these characters could be brought about by direct selection. Days to flowering, days to maturity, tillers per plant and panicle length exhibited high heritability but low genetic advance, suggesting that selection for these characters must be taken up in advance generations.