Study on Grain Filling Characteristics and Heterosis of the Two-line Hybrid Wheat Zayou 3

Zayou 3,a hybrid wheat BNS-type temperature-sensitive-two-line,its male parent Bhoo1,and control(Bainongaikang 58) were used to study the grain-filling model of dry matter accumulation and the correlation of grain filling parameters with grain weight.The results showed that grain dry weight of Zayou 3 changed with S curve.During grain filling process,the dry matter increase of Zayou 3 was higher than that of its male parent,showing strong positive heterobeltiosis.Compared with the control,heterosis of Zayou 3 was obvious at the later grain filling stage.Under the condition of late sowing,there was a increasing tendency for the ultimate thousand kernel weight and the maximum filling rate Vmax.The grain filling rate of Zayou 3 changed as normal curve,and which was significantly higher than that of its male parent at both the pyramid and the faster phases.Meanwhile,it was higher than that of control during the late stage of grain filling.