Trait association studies to determine selection indices in two F3 segregating populations of rice (Oryza sativa L.) under aerobic condition

摘要

Correlation studies with F} segregating populations derived from MAS145 X MAS946-1 and IR64 * IM 192 crosses of rice indicated that panicle length followed by harvest index, panicle weight, plant height at 30 days after transplanting and productive tillers per plant, showed significant positive association with yield per plant. Path analysis studies revealed that harvest index, plant height at 30 days after transplanting, total number of tillers per plant, days to fifty percent flowering exerted maximum positive direct effect on pod yield per plant. Therefore during selection main attention need to be given for traits like plant height at 30DAT, productive tillers/plant, panicle weight, panicle length and harvest index. Based on these characters, top five superior families viz., A16-5, A24-16, A8-14, A3-S andA2-3 in MAS145XMAS946-1cross andB21-15, B12-6, Bl-3, B5-18 and B18-14 in IR 64 x IM 192 cross are selected and advanced. Hence, combination of these traits could be used as selection indices and prime importance has to be given for this selection index during selection in segregating population for development of superior high yielding varieties suitable for aerobic condition thereby we could achieve sustainable rice production.