Genetic effect of panicle traits of intersubspecific crosses of rice ( Oryza sativa ) and its interaction with environment

Abstract

Abstract: The models of genetic effects and genotype×environment interaction for Additive-Dominant-Additive×Additive epistasis were used to analyze the panicle traits of intersubspecific crosses of rice (Oryza sativa.) in different environments. It was found that significant additive, dominant and additive×additive epistatic effects and genotype×environment (GE) interaction were observed in main panicle length, spikelet density, primary branches, total lengths of primary and secondary branches, but the numbers of main panicle and secondary branches showed no significant additive×environment (AE) interaction and dominant×environment (DE) interaction.The seven traits studied were mainly controlled by dominant effects, but branches traits were more obviously affected by DE interaction. Heritabilities analysis showed that the general heritability in broad sense (H_G²) was much larger than other heritabilities. To certain extent,the interaction heritabilities showed their effects in seven panicle traits tested. Heterotic prediction indicated a positive heterosis in all panicle traits except the numbers of primary and secondary branches. GE only influenced the expression extents of heterosis, but was not able to change their directions. According to the predicated genetic effects,IR66158-37,IR65600-85,Minhui63 and R669 were better than other parents in the tactics of breeding for improving panicle traits, because the progenies from these crosses always showed that panicle traits were slightly affected by environment.

Key words: Intersubspecific crosses of rice (Oryza sativa), Panicle traits, Genotype×environment interaction, Additive×Additive epistasis, Heritability, water-use efficiency, light-use efficiency, CO₂ concentration., mechanistic model of light-response, soybean

LIANG Kangjing. Genetic effect of panicle traits of intersubspecific crosses of rice ( Oryza sativa ) and its interaction with environment[J]. Chinese Journal of Applied Ecology, 2000, 11(2): 79-83.

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