Contribution of winter wheat leaf and non-leaf organs to grain weight

To search for new methods of increasing grain weight and to mine yield potential,a two-year study on contribution of top four leaves and non-leaf organs(head,sheaths and stalk)to grain weight was carried out from 2011to 2012through selecting 12different winter wheat cultivars(lines)and designing 21treatments of leaves removal and shading.Contribution rate of top 4leaves to grain weight was 17.8%,flag leaf,second leaf,third leaf and forth leaf was respectively 10.60%,2.80%,0.05% and 1.60%.Contribution rates of head,sheaths and stalk was respectively 41.0%,11.0%and 5.7%.There existed relatively large differences among varieties.By correlation analysis,the positive correlations were found between height,head leave area and contribution rate of flag leaf and second leaves,and also between head stalk,plant height and contribution rate of stalk and sheaths.The negative correlations were found between plant height and contribution rate of third leaf and forth leaf,and also between plant height,head stalk,top 4leaves area,flag leaves area and head contribution.Consequently,it was conducive in increasing grain weight to select cultivars with great contribution of leaves and no-leaf organ to grain weight.