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试验研究全生育期干旱对夏玉米光合特性及C素同化、运转及分配的影响结果表明,水分胁迫对夏玉米各生育期C素代谢的自身规律影响较小,主要是改变C素同化、运转、分配的绝对量和分配率。水分胁迫下夏玉米干物质及其各器官干物质累积速率降低,总量减少,且不同器官干物质转移率、转移量及其对雌穗重的贡献发生改变,叶面积系数、叶绿素含量和光合速率减少,分配、转移到生殖器官的同化物减少。充分供水处理具有最大的干物质累积量和正常的C素代谢,合理的水分供应促进玉米植株生育前期总生物量的积累以及生育后期干物质从营养体向籽粒的转移,成熟期营养器官中的非结构性碳水化合物滞留少,向籽粒中的运转彻底,可获得较高籽粒产量。
Effects of drought on photosynthetic characteristics and assimilation, translocation and distribution of C in maize during the whole growth period The results showed that water stress had little effect on the regularity of C metabolism in different growth stages of summer maize, , The absolute amount allocated and the allocation rate. Under drought stress, the dry matter accumulation and dry matter accumulation rate of summer maize decreased, the total amount decreased, and the dry matter translocation and translocation of different organs and their contribution to ear weight were changed. The leaf area coefficient, chlorophyll content and photosynthesis Reduced rate, distribution, reduction of assimilates transferred to the reproductive organs. Adequate water treatment has the largest accumulation of dry matter and normal C-prime metabolism, and the reasonable water supply promotes the accumulation of total biomass in early growth stages of maize plants and the transfer of dry matter from vegetative bodies to grain in the late growth stage. In mature vegetative organs Non-structural carbohydrate retention less, to the operation of the grain thoroughly, you can get higher grain yield.