Analysis of genetic and genotype × environment interaction effects for agronomic traits of rice (Oryza sativa L.) in salt tolerance

A diallel cross experiment of 4 rice (oryza sativa l.) female and 6 male varieties was conducted to study the genetic effects and their interaction with salt-stress condition of 7 agronomic traits in normal and salt-stressed planting conditions. the panicle length (pl),effective number of panicles per plant (enp),plumped number of grains per panicles (png),total number of grains per panicles (tng),1000-grain weight (w),seed setting ratio (ssr) and grain weight per plant (pgw),were investigated. a genetic model including additive effect,dominance effect and their interaction effects with environment (ade) was employed for analysis of data. it was observed that significant (p<0.05) additive effects,dominance effects,additive × environment interaction effects and dominance × environment interaction effects exist for most of the agronomic traits of rice. in addition,significant (p<0.05) narrow sense heritabilities of enp,png,tng,w and pgw were found,indicating that the genetic performance of these traits are greatly affected by salt stress condition. a significant (p<0.05) negative correlations in the additive effects and additive × environment interaction effects detected between enp and png suggesting that selection on increasing of enp can reduce png. in addition,there exist a highly significant (p<0.01) positive dominance correlation among the dominance effects of the enp,png and tng,which shows that it is possible to breed salt-tolerant rice variety by coordinating large panicle and multi-panicle in utilization of heterosis.