Abstract:

Inheritance of chalky rice rate of north japonica rice was studied by using quantitative character genetic analysis method, with hybrid progenies F1, F2 of ‘Shashani’ (chalky rice rate was 2.5%) and ‘Liaojing 326’(chalky rice rate was 72.3%), which had significant difference in chalky rice rate. The results showed that: (1) chalky rice rate was greatly affected by the maternal plant and no genetic segregation occurs among F2 grains born on F1 plant. (2) The variation of chalky rice rate among grains born on F2 plant was mainly caused by genetic factors, its genetic model was additive-dominance-epistasis major genes additive-dominance polygenes with two major genes, and low chalky rice rate express dominant trait. (3) The heritability of major genes was 90.38% and the heritability of polygenes is 0.11%, and there was a pair of major gene with great effects.