Photosynthetic Induction Under Fluctuating Light Is Affected by Leaf Nitrogen Content in Tomato

文献类型： 外文期刊

第一作者： Sun, Hu

作者： Sun, Hu;Zhang, Shi-Bao;Huang, Wei;Sun, Hu;Zhang, Yu-Qi

作者机构：

关键词： fluctuating light; nitrogen; photosynthesis; mesophyll conductance; photosynthetic limitation

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：6.627； 五年影响因子：7.255 ）

ISSN： 1664-462X

年卷期： 2022 年 13 卷

页码：

收录情况： SCI

摘要： The response of photosynthetic CO2 assimilation to changes of illumination affects plant growth and crop productivity under natural fluctuating light conditions. However, the effects of nitrogen (N) supply on photosynthetic physiology after transition from low to high light are seldom studied. To elucidate this, we measured gas exchange and chlorophyll fluorescence under fluctuating light in tomato (Solanum lycopersicum) seedlings grown with different N conditions. After transition from low to high light, the induction speeds of net CO2 assimilation (A(N)), stomatal conductance (g(s)), and mesophyll conductance (g(m)) delayed with the decline in leaf N content. The time to reach 90% of maximum A(N), g(s) and g(m) was negatively correlated with leaf N content. This delayed photosynthetic induction in plants grown under low N concentration was mainly caused by the slow induction response of g(m) rather than that of g(s). Furthermore, the photosynthetic induction upon transfer from low to high light was hardly limited by photosynthetic electron flow. These results indicate that decreased leaf N content declines carbon gain under fluctuating light in tomato. Increasing the induction kinetics of g(m) has the potential to enhance the carbon gain of field crops grown in infertile soil.

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