Glycine increases cold tolerance in rice via the regulation of N uptake, physiological characteristics, and photosynthesis

文献类型： 外文期刊

第一作者： Cao Xiaochuang

作者： Cao Xiaochuang;Zhong Chu;Zhu Lianfeng;Zhang Junhua;Hussain, Sajid;Jin Qianyu;Wu Lianghuan;Jin Qianyu

作者机构：

关键词： Cold stress;Nitrogen form;Amino acids;Photosynthesis;Physiological trait;Rice

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：4.27； 五年影响因子：4.816 ）

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收录情况： SCI

摘要： To investigate the response of rice growth and photosynthesis to different nitrogen (N) sources under cold stress, hydroponic cultivation of rice was done in greenhouse, with glycine, ammonium, and nitrate as the sole N sources. The results demonstrate that exposure to low temperature reduced the rice biomass and leaf chlorophyll content, but their values in the glycine-treated plants were significantly higher than in the ammonium-and nitrate-treated plants. This might be attributed to the higher N uptake rate and root area and activity in the glycine-treated plants. The glycine-treated plants also maintained high contents of soluble proteins, soluble sugars, and proline as well as enhanced antioxidant enzyme activities to protect themselves against chilling injury. Under cold stress, reduced stomatal conductance (g(s)) and effective quantum efficiency of PSII Phi(PSII)) significantly inhibited the leaf photosynthesis; however, glycine treatment alleviated these effects compared to the ammonium and nitrate treatments. The high non-photochemical quenching (qN) and excess energy dissipative energy (E-x) in the glycine-treated plants were beneficial for the release of extra energy, thereby, strengthening their photochemical efficiency. We, therefore, conclude that the strengthened cold tolerance of glycine-treated rice plants was closely associated with the higher accumulation of dry matter and photosynthesis through the up-regulation of N-uptake, and increase in the content of osmoprotectants, activities of the antioxidant defense enzymes, and photochemical efficiency. The results of the present study provide new ideas for improving the plant tolerance to extreme temperatures by nutrient resource management in the cold regions. (C) 2017 Elsevier Masson SAS. All rights reserved.

分类号： Q945`Q946

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