Effects of deficit irrigation on photosynthesis, photosynthate allocation, and water use efficiency of sugar beet
Effects of deficit irrigation on photosynthesis, photosynthate allocation, and water use efficiency of sugar beet
复制标题
亏缺灌溉对甜菜光合作用、光合产物分配及水分利用效率的影响
DOI：
10.1016/j.agwat.2019.105701
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发表时间：
2019-08-20
影响因子：
6.7
通讯作者：
Kisekka, Isaya
中科院分区：
文献类型：
--
作者：
Li, Yangyang;Liu, Ningning;Kisekka, Isaya
亏缺灌溉通常被用来提高干旱地区的作物产量。本研究对甜菜的生理反应和产量进行了评价。在冠层发育阶段，分别采用田间持水量(FC)的30%、50%和70%三种灌溉处理，以转亏缺灌溉。结果表明，亏缺灌溉显著提高了甜菜主根干物质含量。中度亏缺灌溉处理(50%FC)的干物质含量高于重度亏缺灌溉处理(30%FC)。只有重度亏缺灌溉处理显著降低甜菜产量。甜菜的光合作用参数随水分亏缺程度的增加而降低。而适度亏缺灌溉处理显著提高了瞬时水分利用效率(WUEi)和产量水分利用效率(WUEy)。叶片C-13与甜菜WUEY呈显著负相关。复水后，中度亏缺灌溉处理的光合作用产物更多地分配到主根中，从而提高了产量，而重度亏缺灌溉处理中，更多的光合作用物质分配到了地上部分。用短期气体交换测量来指示甜菜干物质积累，并将结果用于制定甜菜亏缺灌溉管理策略。
Deficit irrigation is commonly used to improve crop yields in arid land. Our study evaluated the response of physiology and yield of sugar beet (Beta vulgaris L. cv. Beta 356) to deficit irrigation via applying three irrigation treatments (30%, 50%, and 70% of field capacity (FC)) during canopy development stage. The results showed that deficit irrigation significantly increased the dry matter of sugar beet taproot. The dry matter for the moderate deficit irrigation treatment (50% FC) was more than that for the severe deficit irrigation treatment (30% FC). Only severe deficit irrigation treatment significantly reduced the yield of sugar beet. Photosynthetic parameters of sugar beet reduced with water deficit increasing. However, the moderate deficit irrigation treatment significantly increased instantaneous water use efficiency (WUEi) and water use efficiency for yield (WUEy). Leaf Delta C-13 was negatively correlated with the WUEy of sugar beet. After rehydration, more photosynthate was allocated to taproot for the moderate deficit irrigation treatment, which increased the yield, while more photosynthate was allocated to the aboveground part for the severe deficit irrigation treatment. Short-term gas exchange measurement was used to indicate the dry matter accumulation, and the result was used to formulate deficit irrigation management strategies for sugar beet.