Soil Science and Plant Nutrition Department, Harran University, Sanliurfa, Turkey.
University of Lahore, Lahore, Pakistan; International Centre for Chemical and Biological Sciences, University of Karachi, Pakistan.
Environ Pollut. 2022 Mar 15;297:118727. doi: 10.1016/j.envpol.2021.118727. Epub 2021 Dec 29.
The main objective of the study was to assess if joint application of melatonin (MT, 0.1 mM) and salicylic acid (SA 0.5 mM) could improve tolerance of pepper plants to arsenic (As) as sodium hydrogen arsenate heptahydrate (0.05 mM). The imposition of arsenic stress led to accumulation of As in roots and leaves, and increased contents of leaf proline, phytochelatins, malondialdehyde (MDA) and HO, but it reduced plant biomass, chlorophylls (Chl), PSII maximum efficiency (Fv/Fm) and leaf water potential. Melatonin and SA applied jointly or alone enhanced nitrogen metabolism by triggering the activities of glutamate synthase, glutamine synthetase, and nitrite reductases and nitrate. In comparison with a single treatment of MT or SA, the joint treatment of MT and SA had better impact on enhancing growth and key biological events and decreasing tissue As content. This clearly shows a cooperative function of both agents in enhancing tolerance to As-toxicity in pepper plants.
本研究的主要目的是评估褪黑素（MT，0.1mM）和水杨酸（SA，0.5mM）联合应用是否可以提高辣椒植株对砷酸钠七水合物（0.05mM）的耐受力。施加砷胁迫会导致砷在根和叶中的积累，并增加叶片脯氨酸、植物螯合肽、丙二醛（MDA）和 HO 的含量，但会降低植物生物量、叶绿素（Chl）、PSII 最大效率（Fv/Fm）和叶片水势。褪黑素和 SA 单独或联合施加通过触发谷氨酸合酶、谷氨酰胺合酶和亚硝酸盐还原酶以及硝酸盐的活性来增强氮代谢。与 MT 或 SA 的单一处理相比，MT 和 SA 的联合处理对促进生长和关键生物事件以及降低组织砷含量有更好的影响。这清楚地表明了两种试剂在增强辣椒植株对砷毒性的耐受性方面具有协同作用。
