Effect of Leaf Removal on Photosynthetic Rate and Yield Per Stem in Different Spike-type Wheat Varieties

In order to ascertain the contribution of leaves in different spike-type wheat varieties to grain yield in high-yield condition,two spike-type wheat varieties were selected as experimental materials,effects of leaf removal at heading date on the net photosynthetic rate of remnant leaves,node dry weight and setting kernels and grain weight in different spike-type wheat varieties were studied.The results showed that the net photosynthetic rate of remanent leaves raised owing to leaf removal and the net photosynthetic rate of remanet leaves in multi-spike variety Yumai49 increased more significantly.But it could not compensate the loss caused by leaf removal,final results were that both seed set kernels and grain weight decreased.With the increasement of leaves removed and the riseup of leaf-position,seed set kernels and grain weight decreased significantly.The node dry weight in large-spike variety Su2001 decreased significantly after leaf removal.Effects of leaf removal at heading stage on grain yield of Yumai49 were more than that of Su2001.