NATURE OF GENETIC CONTROL OF SUBMERGENCE TOLERANCE IN RICE

Abstract

Inheritance of submergence tolerance in rice was investigated in a 10 x 10 diallel cross. A strong prepotency of parents was found in transmitting the character to their offsprings. Tolerance was dominant over susceptibility and the average dominace was within the range of incomplete dominance. Wr-vr graphic analysis suggested the involvement of both major and minor genes. Additive and non additive gene effects were highly significant. A high narrow sense heritability (71%) indicated that additive gene effects were more prominent. Parents highly tolerant to submergence also had high gca effects. The hybrids CNL~1 x FR-13A, Pankaj x FR-13A, Mahsuri x FR-13A, CNL 31 x rufipogon, Pankaj x rufipogon, Mashsuri x rufipogon, IR 42 x rufipogon and CNL 31 x FR-43B appeared to be promising for incorporating an adequate level of tolerance to submergence into susceptible cultivars as indicated by their significant sca estimates.