Abstract: Two panicle type cultivars with erect panicle and curved panicle were applied to study relationship between chalky characters,shapes of grains and the quality at different grain positions of japonica rice.The results showed that grain shape had a significant relationship with chalky characters traits at different grain positions,both of which affect head rice percentage.Grain length,grain width,length-thickness ratio and width-thickness ratio had significantly positive correlation with head rice percentage.Chalky grain percentage and chalkiness degree had significantly negative correlation with head rice percentage.Effects of erect panicle type gene on the nutritional quality were mainly manifested not only in significantly positive correlation between grain length,grain width,length-thickness ratio and width-thickness ratio and taste quality,amylose content,gel consistence,peak viscosity,hot paste viscosity and breakdown,but also in significantly negative correlation between grain length,grain width,length-thickness ratio and width-thickness ratio and pasting temperature,total protein content,glutelin content,albumin content,fatty acid content and setback.Chalk white character had close relationship with cooking and eating quality,nutritional quality and RVA profile characteristics values.Chalky grain percentage and chalkiness degree had significantly negative correlation with taste quality,amylose content,gel consistence,globulin content,peak viscosity,hot paste viscosity,breakdown,cool paste viscosity and consistence,but had significantly positive correlation with pasting temperature,albumin content,prolamin content,glutelin content,total protein content,fatty acid content and setback.It is one of the effective ways to improve japonica rice that breeding the grains with low chalky characters,high length-thickness ratio and width-thickness ratio.

Key words: Japonica rice, Grain position, Chalky characters, Grain shapes, Quality characters

CLC Number: 

• S511.01