Huang J X, Liu Y B, Xiao R, Yu T, Guo T, Wang H W, Lv X L, Li X N, Zhu M, Li F H
College of Agronomy, Specialty Corn Institute, Shenyang Agricultural University, 110866 Shenyang, Liaoning Province, China.
Liaoyuan Farmer Science and Technology Education Center, 136200 Liaoyuan, Jilin Province, China.
Photosynthetica. 2024 Jan 26;62(1):58-70. doi: 10.32615/ps.2024.004. eCollection 2024.
Improper use of nicosulfuron (NSF) may induce harmful effects on plants during weed control. Melatonin (MT) regulates photosynthetic and physiological processes in plants. This study aimed to explore the effects of MT on alleviating NSF toxicity by measuring the growth parameters, photosynthetic capacity, and antioxidative responses in sweet corn seedlings. Compared to NSF alone, exogenous MT increased chlorophyll content, transpiration rate, net photosynthetic rate, stomatal conductance, and maximum efficiency of PSII photochemistry, while reduced malondialdehyde, hydrogen peroxide, superoxide anion radical, and proline contents. Moreover, MT also increased the activity of ascorbate peroxidase and the expression levels of , , , and . The inhibition of -chlorophenylalanine inhibited the positive effects of MT on photosynthetic and physiological indexes. The results indicated that pretreatment with MT might effectively mitigate NSF toxicity in sweet corn seedlings.
在杂草防治过程中，不当使用烟嘧磺隆（NSF）可能会对植物产生有害影响。褪黑素（MT）可调节植物的光合和生理过程。本研究旨在通过测定甜玉米幼苗的生长参数、光合能力和抗氧化反应，探讨MT对减轻NSF毒性的影响。与单独使用NSF相比，外源MT增加了叶绿素含量、蒸腾速率、净光合速率、气孔导度和PSII光化学最大效率，同时降低了丙二醛、过氧化氢、超氧阴离子自由基和脯氨酸含量。此外，MT还增加了抗坏血酸过氧化物酶的活性以及 、 、 和 的表达水平。对氯苯丙氨酸的抑制作用抑制了MT对光合和生理指标的积极影响。结果表明，MT预处理可能有效减轻甜玉米幼苗的NSF毒性。
