Variability of leaf photosynthetic characteristics in rice and its relationship with resistance to water stress under different nitrogen nutrition regimes

文献类型： 外文期刊

第一作者： Cao Xiaochuang

作者： Cao Xiaochuang;Zhong Chu;Zhu Chunquan;Zhang Junhua;Zhu Lianfeng;Jin Qianyu;Wu Lianghuan

作者机构：

期刊名称：PHYSIOLOGIA PLANTARUM （ 影响因子：4.5； 五年影响因子：4.576 ）

ISSN： 0031-9317

年卷期： 2019 年 167 卷 4 期

页码：

收录情况： SCI

摘要： The negative effects of water stress on rice can be alleviated by NH4+ nutrition. However, the effects of mixed nitrogen (N) nutrition (NO3-+NH4+) on resistance to water stress are still not well known. To investigate the response of rice growth to water stress and its relationship with photosynthetic characteristics, a hydroponic experiment supplying different N forms was conducted. Compared with NO3- nutrition, mixed-N and NH4+ nutrition greatly alleviated the reduction of leaf area, chlorophyll content, and photosynthesis under water stress, whilst subsequently maintaining higher biomass. In contrast, water stress inhibited the root-shoot ratios in NH4+- and mixed-N-supplied plants, indicating reduced root growth and higher photosynthate availability to shoots. The following key observations were made: (1) a similar stomatal limitation and low proportion of activated Rubisco were observed among the three different N nutrition regimes; (2) increased mesophyll conductance in NH4+- and mixed-N-supplied plants simultaneously stimulated leaf photosynthesis and improved the water use efficiency and (3), the maximum carboxylation rate and actual photochemical efficiency of photosystem II in NH4+- and mixed-N-supplied plants were significantly higher than that in NO3--supplied plants, thus resulting in higher photochemical efficiency under water stress. In conclusion, mixed-N and NH4+ nutrition may be used to develop strategies for improved water stress resistance and stimulated biomass production under conditions of osmotic stress and possibly drought.

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