Abstract:

Hybrids of auto-tetraploid rice were stronger biological superiority than hybrids of diploid rice. The genetic basis of the biological superiority was still unclear. Genetic model for Additive-Dominant and statistical analytic methods and parents and F1 offsprings in 4×12 incomplete diallel cross of autotetraploid rice were used to analyze the inheritance of agronomic traits in autotetraploid rice. The results indicated that agronomic traits were controlled by the main genetic effects in addition to the G×E interaction effects. Plants height and panicle length, width of flag leave, effective panicle number and length of flag leave were mainly controlled by dominant effects, additive effects and domain × environment interaction effects, respectively. Value of HN and HB for plant height, panicle length and width of flag leave were lager than those of HNE and HBE, it indicated that environment had little influenced on the select effects of plant height, panicle length and width of flag leave. Value of HN and HB for effective panicle number and length of flag leave were smaller than those of HNE. It suggested that select effects of effective panicle number and length of flag leave were different in different environments. Results of this study provided theoretical basis to the effective utilization of autotetraploid rice in breeding.