College of Agriculture, Nanjing Agricultural University, Nanjing, China; Key Laboratory of Crop Physiology Ecology and Production Management, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, China; Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing Agricultural University, Nanjing, China.
College of Agriculture, Nanjing Agricultural University, Nanjing, China; Key Laboratory of Crop Physiology Ecology and Production Management, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, China; Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing Agricultural University, Nanjing, China; National Engineering and Technology Center for Information Agriculture, Nanjing, China.
Plant Physiol Biochem. 2021 Jun;163:367-375. doi: 10.1016/j.plaphy.2021.03.058. Epub 2021 Apr 20.
Melatonin (MT), an important antioxidant existing in plants and animals, has been widely reported to participate in the process of plants coping with stress. In this study, we demonstrated the mechanism of MT enhancing photosynthesis in rice under salt stress. The results showed that MT treatment increased relative water content, sucrose and starch content of rice under salt stress. This was mainly owing to the fact that MT enhanced the net photosynthetic rate and enhanced the absorption and transmission of light energy. The effect of MT on photosynthesis of rice under salt stress conditions was mainly due to the regulation of three processes: maintaining low ROS status by improving the total antioxidant capacity, promoting the xanthophyll cycle and increasing the xanthophyll pool size to dissipate excess light energy, increasing the activities of key photosynthetic enzymes. Taken together, these results provide a mechanism for MT to improve the photosynthetic capacity of rice under salt stress.
褪黑素（MT），一种存在于动植物中的重要抗氧化剂，已被广泛报道参与植物应对压力的过程。在这项研究中，我们证明了 MT 增强盐胁迫下水稻光合作用的机制。结果表明，MT 处理增加了盐胁迫下水稻的相对含水量、蔗糖和淀粉含量。这主要是因为 MT 提高了净光合速率，增强了对光能的吸收和传递。MT 对盐胁迫下水稻光合作用的影响主要归因于对三个过程的调节：通过提高总抗氧化能力来维持低 ROS 状态，促进叶黄素循环并增加叶黄素库大小以耗散多余的光能，增加关键光合酶的活性。总之，这些结果为 MT 提高盐胁迫下水稻的光合能力提供了机制。
