Genetic Analysis on External Grain Quality in Rice

Genetic analysis of four crosses in indica rice were carried out for their external grain quality.The results showed that grain lenth,width and lenth/width belong to quantitative inheritance,the segregation of F2 generation showed a continuous variation with one-peak curve which located between the two parents.The additive gene effects contributed main function to above traits and dominant gene also played an important role.The chalkiness character in F2 showed a continuous variation,quantitative inheritance and non-normal distribution.Dominant gene effect on above characters was also obvious.The broad-sense heritabilities of these four traits are higher,thus the selections should be practiced in the earlier generations.The analysis data showed that the positive correlation was found between chalkiness and width characters,but negative between chalkiness and lenth/width value.It is easy to obtain chalkiness-free or little-chalkiness appearances by selecting single plant with small-width and narrow-long grain types in rice breeding.