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运用 14 C示踪技术研究了留营养枝棉株 14 C同化物生产运转分配规律。结果表明 :留营养枝与否对全株 14 C总同化量基本没有影响 ,但留营养枝棉株果枝叶的相对光合强度 (以放射性比强度表示 )降低 ;主茎叶、果枝叶的 14 C同化量显著降低 ;营养枝叶具有较高的光合作用强度和向外输送 14 C同化物的转运速率 ,在 14 C同化物生产运转分配中占有很重要的地位。留营养枝棉株 14 C同化物在花铃期向主茎和果枝的分配极显著降低 ,从而导致主茎和果枝发育较差、结铃数量减少 ,但营养枝可间接着生蕾铃 ,在产量形成中占有一定比重。因此 ,留营养枝与否对皮棉产量无显著影响。
The 14 C tracing technique was used to study the production and distribution of 14 C assimilates in vegetative shoots and cotton plants. The results showed that whether the vegetative shoots or not had no effect on the 14C total assimilation of the whole plant, the relative photosynthetic intensity (expressed as the specific radioactivity intensity) of branches and leaves of vegetative shoots and cotton leaves decreased. The 14 C The assimilation amount decreased significantly. The higher photosynthetic intensity and the translocation rate of 14 C assimilates in vegetative branches and leaves played an important role in 14 C assimilate production and distribution. The distribution of 14 C assimilates in vegetative shoots and cotton branches reduced significantly to the main stems and fruiting branches during the flower-boll stage, resulting in poor development of the main stems and fruiting branches and reducing the number of bolls, but the vegetative branches could indirectly bear the buds. Yield formation accounts for a certain proportion. Therefore, leaving vegetative shoots had no significant effect on lint yield.