Analysis of grain filling characteristics of different wheat varieties.

In order to achieve high yield and offer evidence for selecting new varieties,the grain-filling processes of ten different wheat varieties were studied.The results showed that grain dry-weights showed S curve at grain-filling period.Wheat grain filling stage can be divided into gradual increase stage,the rapid increase stage,and increasing period.Correlation analysis showed grain-weight were decided by rapid increase stage and grain filling rate and was not obvious with the entire grain-filling period.In rapid increase stage,faster grain-filling rate,longer duration,more dry-matter accumulation quantity and higher grain weight.The differences of Grain Filling Characteristics between varieties were obvious;Comprehensive analysis showed that the grain-filling rate of Xiangmai 29 and BN AK58-1 were faster,the grain-weight were higher.