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以美棉33B为材料,于棉花中部果枝开花时进行渍水7 d和14 d处理,研究花铃期渍水对不同果枝部位棉铃对位叶净光合速率与干物质累积及产量的影响。结果显示,渍水处理棉铃对位叶净光合速率随渍水持续期延长而降低,降幅为中部果枝>上部果枝>下部果枝。渍水后棉花地上部干物质累积降低,水分胁迫指数随果枝部位的上升而增加,下部果枝的干物质分配系数增加,根系、叶片分配系数降低而蕾铃分配系数增加。渍水后棉花产量在不同果枝部位的表现与物质分配结果一致。因此,花铃期渍水降低了棉花净光合速率,致使光合产物减少并改变其在不同果枝及器官间的分配,是不同果枝部位产量降低的物质基础。
The effects of waterlogging on the net photosynthetic rate and dry matter accumulation and yield of the bollwings at different fruiting branches were studied by using the American cotton 33B as the material. The results showed that the net photosynthetic rate of flag leaf of waterlogging treatment decreased with the prolongation of waterlogging, decreasing from the middle fruit branch> the upper fruit branch> the lower fruit branch. The waterlogging index increased with the increase of fruiting branches after waterlogging. The dry matter partition coefficient of the lower fruiting branches increased, the partition coefficients of roots and leaves decreased and the partition coefficients of bolls increased. The performance of cotton yield in different fruiting branches after waterlogging is consistent with the results of material allocation. Therefore, the waterlogging period reduced the net photosynthetic rate of cotton, resulting in the decrease of photosynthetic products and their distribution in different fruiting branches and organs, which was the material basis for reducing the yield of different fruiting branches.