Foliar-applied salicylic acid alleviates heat and high light stress induced photoinhibition in wheat (Triticum aestivum) during the grain filling stage by modulating the psbA gene transcription and antioxidant defense
Foliar-applied salicylic acid alleviates heat and high light stress induced photoinhibition in wheat (Triticum aestivum) during the grain filling stage by modulating the psbA gene transcription and antioxidant defense
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叶面喷施水杨酸通过调节 psbA 基因转录和抗氧化防御，缓解小麦灌浆期热和强光胁迫引起的光抑制
DOI：
10.1007/s10725-014-9889-9
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发表时间：
2014-01
影响因子：
4.2
通讯作者：
Liu, Shuchun
中科院分区：
文献类型：
--
作者：
Wang, Yuexia;Zhang, Huanling;Hou, Pengfei;Su, Xiaoyu;Zhao, Pengfei;Zhao, Huijie;Liu, Shuchun
研究了叶面喷施水杨酸（SA）对小麦（Triticum aestivum）灌浆期高温强光胁迫的保护作用。具体而言，光系统II（PSII）的光化学的小麦旗叶下SA处理的胁迫反应的指标进行了研究。我们的研究结果表明，在胁迫下，SA-补充小麦植株保持较高的叶绿素含量，PSII的光化学活性，和净光合速率相比，非SA处理的植物，此外，SA-补充植物恢复更快地从光抑制时，应力被删除。SA处理的植株抑制了由胁迫引起的psbA基因转录水平的下降，并在胁迫解除后恢复到原来的对照水平。此外，叶面补充SA可以维持或提高抗氧化酶的活性，包括超氧化物歧化酶，抗坏血酸过氧化物酶和过氧化氢酶，这是已知的小麦作物提供保护免受氧化胁迫。综上所述，我们的研究结果表明，叶面喷施SA可以通过增强psbA基因（编码D1蛋白）的转录，以及通过减轻由高水平的抗氧化酶活性所实现的光氧化来保护PSII复合体免受光损伤，这使得PSII从热和强光胁迫中更快地恢复功能。
In this study, we investigated the effects of foliar applied salicylic acid (SA) on protecting wheat (Triticum aestivum) from heat and high light stress during the grain filling stage. Specifically, the Photosystem II (PSII) photochemistry of wheat flag leaves under the treatment of SA was studied as indicators for stress response. Our results indicated that under stress, SA-supplemented wheat plants maintained higher chlorophyll content, photochemical activity of PSII, and net photosynthetic rate in comparison to non-SA treated plants, and, in addition, the SA-supplemented plants recovered more rapidly from photoinhibition when the stress was removed. SA-treated plants inhibited the decrease of thepsbAgene transcription that is caused by stress and then recovered to the original control level after the stress was removed. In addition, foliar supplementation of SA could maintain or elevate the activities of antioxidative enzymes, including superoxide dismutase, ascorbate peroxidase, and catalase, which are known to provide protection against oxidative stress for wheat crops. Taken together, our results suggest that foliar application of SA can protect the PSII complex from photo-damage through enhanced transcription of thepsbAgene (encoding D1 protein), as well as through mitigating photo-oxidation enabled by a high level of anti-oxidative enzyme activities, which allows for faster functional recovery of PSII from heat and high light stress.
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影响因子：
4.2
作者：
Li-Jun Wang;Shao-hua Li
通讯作者：
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影响因子：
2.7
作者：
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作者：
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影响因子：
4.2
作者：
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