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The Effect of Hypoxic Stress on Nitrate Absorption and Amino Acid Metabolism of Tea Plants

文献类型： 外文期刊

作者： Wang, Yongxin;Lei, Yuping;Wei, Kang;He, Mengdi;Wang, Liyuan

作者机构：

关键词： Hypoxia stress;Tea plant;Nitrate;Gene expression

期刊名称： JOURNAL OF PLANT GROWTH REGULATION

ISSN： 0721-7595

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Nitrogen metabolism plays pivotal roles in the stress response of plants. Nitrate (NO3-) is a crucial factor that enhances plant tolerance to hypoxia. This study subjected tea plants to hypoxia stress and conducted a comprehensive analysis of their free amino acid content, NO3- absorption and distribution rates, endogenous NO3- and NH4+ levels, as well as the expression of related genes. The results indicated that hypoxic stress reduced both the total free amino acids and theanine content in tea plants, while significantly increased the levels of alanine (Ala) and gamma-aminobutyric acid (GABA). Analysis using 15N-labeled NO3- revealed that hypoxic stress increased the absorption rate of NO3-. Furthermore, the distribution rate of 15NO3- was increased in roots but decreased in stems and leaves, suggesting that hypoxia impairs the transport of NO3- from underground parts to aboveground parts in tea plants. The ratio of NO3-/NH4+ was significantly reduced in roots, while increased in leaves under hypoxic conditions, indicating enhanced nitrate assimilation in roots but diminished assimilation in leaves during such stress. This study provides valuable insights into understanding how hypoxia affects nitrate absorption and amino acid metabolism in tea plants.

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