剪叶对不同穗型小麦品种光合速率及单茎产量的影响

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

为了探讨高产条件下不同穗型小麦品种叶片对产量的贡献,选用两种穗型小麦品种为试验材料,研究了抽穗期剪叶对剩余叶片光合速率、茎秆干重及籽粒结实与粒重的影响。结果表明,剪叶可提高剩余叶片光合速率,以多穗型品种豫麦49剩余叶片净光合速率增幅较大,但不足以弥补剪叶造成的损失,表现为结实粒数减少、粒重降低;随被剪叶片数的增加和叶位的升高,结实粒数和粒重降低更多。剪叶后大穗型品种宿2001茎秆干重明显减轻。抽穗期剪叶对多穗型品种豫麦49籽粒产量的影响大于大穗型品种宿2001。

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 remanel 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 largespike 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.