Gene action study for different morpho-physiological and some quality traits in segregating generation (F2) of rice (Oryza sativa L)

摘要

Gene action for yield, its components and some grain quality traits in rice (Oryza sativa L.) were studied in nine parents F_2 diallel (excluding reciprocals). Five out of the nine parents were semi dwarf (90-115cm) suitable for cultivation in mid and low hills and four were intermediate (115-125cm). Gene action estimated through Hayman's (1954) approach revealed that both additive and non-additive gene actions but predominance of non-additive gene action for traits viz., plant height, days to 50%flowering, days to maturity, leaf area index, panicle length, 100 grain weight, and net-assimilation rate. Predominance of additive gene action was reported only for amylose content however; only dominant gene action was reported for grain yield, biological yield, harvest index, dry matter, grain length, grain breadth, grain length: breadth ratio and protein content. Proportion of dominant genes in the parent was higher for traits like grain yield, biological yield, harvest index, dry matter, 100 grainweight, net-assimilation rate, grain length, grain breadth, grain length: breadth ratio, protein content and amylose content. For the remaining traits, proportion of recessive genes in the parents was higher. Majority of the traits were mainly governedby non-additive gene action, which can be easily transferred through hybridization programmes.