Abstract:

【Objective】The objective of the experiment was to study the effects of different water stress at seedling stage and rewatering on photosynthetic characteristics and water use efficiency (WUE) of peanut, and to provide a scientific basis for water saving and high-yield cultivation of peanut. 【Method】The method of pool culture in rainproof installations was used to study the effects of different drought at seedling stage and rewatering on photosynthetic characteristics, water consumption, yield, WUE and other indexes of peanut. 【Result】 Under drought at seedling stage of peanut, photosynthetic rate and transpiration rate both decreased, and furthermore, the longer the duration of drought was, and the more they reduced obviously, then, after rewatering, both the photosynthetic rate and transpiration rate can recover fast, and there was a compensation effect to some extent, but there were no over-compensation effects. Meanwhile, drought at seedling stage of peanut induced the reduction of water consumption, and the more severe droughts the smaller water consumption, however, WUE did not decrease with the water consumption decrease. Under the treatment of 5 d drought, WUE of the yield level was the highest, the control was the second, and the 15 d drought was the smallest.【Conclusion】At peanut seedling stage, the moderate drought process can reduce water consumption, and can also increase the WUE of production levels.

Key words: peanut, drought, rewatering, photosynthetic characteristics, water use efficiency