Dynamic of Endosperm Cell Proliferation and Relation to Grain Weight and Grain Volume of Wheat

To know about the wheat grain filling under the bad condition, and to improve the yield and the quality of wheat in Hubei province, the dynamic of endosperm cell proliferation and its relation to grain weight and grain volume were studied using three wheat cultivars (lines) with different grain types. The results showed that the proliferation process of endosperm cell could be better modeled with Richards equation. The endosperm cell number of different cultivars (lines) had significant difference. It showed that the endosperm cell number of Een 1 (with large and plump grains) was greater than that of Huamai 8 (with small and plump grains), the endosperm cell number of 95A10(with 1arge grain volume but wrinkled grain) was between other two cultivars. The initial proliferation potential of vigorous grains were higher, the reaching time of maximum cell proliferation rate of them was shorter, and the active proliferation duration of them was also longer than those of weak gains. The final endosperm cell number of vigorous grains was greater than that of weak grains. Multivarivate statistic ana1ysis showed that the grain volume was mainly determined by the number of endosperm cell and the volume of single endosperm cell, and the grain weight was mainly determined by the number of endosperm cell and the weight of single endosperm cell.