Resveratrol Alleviates the KCl Salinity Stress of Malus hupehensis Rhed.
Resveratrol Alleviates the KCl Salinity Stress of Malus hupehensis Rhed.
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白藜芦醇缓解湖北海棠的KCl盐度胁迫
DOI：
10.3389/fpls.2021.650485
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发表时间：
2021
影响因子：
5.6
通讯作者：
Zheng X
中科院分区：
文献类型：
--
作者：
Li T;Li Y;Sun Z;Xi X;Sha G;Ma C;Tian Y;Wang C;Zheng X
苹果园为提高苹果品质和产量而大量施用钾肥缓解了KCl胁迫。白藜芦醇（resveratrol，Res）作为植物抗毒素，参与植物对生物胁迫的抗性。然而，其在KCl胁迫中的作用从未被报道过。本文研究了Res在平邑甜茶KCl胁迫反应中的作用，一种对KCl胁迫敏感的苹果砧木。KCl胁迫下苹果幼苗表现出明显的萎蔫现象，光合速率下降，施用100 μmol Res可缓解KCl胁迫，维持光合能力。外源Res能增强过氧化物酶和过氧化氢酶的活性，从而消除KCl胁迫诱导的活性氧的产生。外源Res可通过积累脯氨酸来维持渗透平衡，从而减少KCl胁迫下的电解质渗漏。此外，外源Res可通过调节K+和Na+转运蛋白基因的表达，增强K+外流，抑制Na+外流和K+吸收，并将K+分隔到液泡中，从而影响细胞质中K+/Na+的稳态。这些结果为应用外源稀土缓解苹果KCl胁迫提供了理论依据。
Applying large amounts of potash fertilizer in apple orchards for high apple quality and yield aggravates KCl stress. As a phytoalexin, resveratrol (Res) participates in plant resistance to biotic stress. However, its role in relation to KCl stress has never been reported. Herein we investigated the role of Res in KCl stress response of Malus hupehensis Rehd., a widely used apple rootstock in China which is sensitive to KCl stress. KCl-stressed apple seedlings showed significant wilting phenotype and decline in photosynthetic rate, and the application of 100 μmol Res alleviated KCl stress and maintained photosynthetic capacity. Exogenous Res can strengthen the activities of peroxidase and catalase, thus eliminating reactive oxygen species production induced by KCl stress. Moreover, exogenous Res can decrease the electrolyte leakage by accumulating proline for osmotic balance under KCl stress. Furthermore, exogenous Res application can affect K+/Na+ homeostasis in cytoplasm by enhancing K+ efflux outside the cells, inhibiting Na+ efflux and K+ absorption, and compartmentalizing K+ into vacuoles through regulating the expression of K+ and Na+ transporter genes. These findings provide a theoretical basis for the application of exogenous Res to relieve the KCl stress of apples.
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