The Relationship among Yield Structure Heterosis of Strong Heterosis Hybrid Wheat

From 1999 to 2001, thirty six hybrids were got from nine diallel crosses. Yield and yield structure heterosis were divided into different groups by single characteristic method of Nair grouping. The results showed that the heterosis of each yield component was different at different yield levels. Among the crosses with strong heterosis at the level of yield heterosis above ten percent, the contribution of the grain weight per head heterosis to yield heterosis was the largest, the 1000 kernel weight heterosis to yield heterosis was the smallest. The study on the relationship of each yield component heterosis and yield heterosis implied that the heterosis of each yield component could appropriately developed, we shouldnt only go after one component heterosis , yet overlooked another heterosis .