Abstract: According to the investigation in the dry matter accumulation of grain weight in the period of grain filling from the winter wheat Hengguan 35,showed that this variety have a little lower grain filling rate than that of CK in the beginning of grain filling period and in the end of grain filling period this variety have a faster grain filling rate,and have a faster dry accumulation rate obviously. In the whole period of grain filling,the average of daily increment of dry matter accumulation is 0. 007 g more than that of CK,and the rate of increased is 18. 92 percent more than that of CK. the grain filling point is the contribution rate of flag leaf is bigger than that of CK in the beginning and middle of grain filling period and is lower than that of CK in the end of grain filling period,especially the contribution rate is lower in the middle and end of grain filling period after May 30th; the top second leaf have a higher contribution rate than that of CK in the middle and end of grain filling period and the contribution rate in the beginning of grain filling period is close to the contribution rate of CK. Except flag leaf,the top second leaf not only in the beginning and middle of grain filling period can prove the grain weight but also when the top second leaf of CK lost the function in the end of grain filling period,the top second leaf of Hengguan35 still have strong function,and the contribution rate achieve 23 percent.

Key words: Winter wheat, Flag leaf, Top second leaf, Dry matter accumulation

CLC Number: 

• S512.01