Effects of melatonin on photosynthetic performance and antioxidants in melon during cold and recovery
文献类型: 外文期刊
第一作者: Zhang, Y. P.
作者: Zhang, Y. P.;Chen, Y. Y.;Zhang, Y. P.;Yang, S. J.;Chen, Y. Y.
作者机构:
关键词: antioxidant enzymes and respective genes;chlorophyll content and fluorescence;Cucumis melo;net photosynthetic rate;stomatal conductance
期刊名称:BIOLOGIA PLANTARUM ( 影响因子:1.747; 五年影响因子:2.146 )
ISSN:
年卷期:
页码:
收录情况: SCI
摘要: Melatonin (MT), a tryptophan derivative, plays an important role in the function and survival of organisms. To better understand the role of MT in cold tolerance, the melon (Cucumis melo L.) were sprayed with various concentrations of MT (0, 50, 100, 200 or 400 mu M), exposed to cold stress (day/night temperature of 12/6 A degrees C) for 7 d, and then returned to optimal conditions (28/18 A degrees C) for 7-d recovery. The foliar application of MT (especially 200 mu M) significantly alleviated cold-induced growth suppression, and MT-treated plants recovered more quickly than untreated plants. Further, MT-treated plants had higher chlorophyll content, photosynthetic rate, stomatal conductance, as well as maximal quantum yield of photosystem (PS) II photochemistry, and efficiency of excitation energy capture of open PS II centres under cold stress than untreated plants. Furthermore, exogenous MT significantly reduced malondialdehyde content and markedly increased the activities of antioxidant enzymes superoxide dismutase (SOD), guaiacol peroxidase (POD), and catalase (CAT) under cold stress. MT also increased expression of antioxidant genes CmSOD, CmPOD, and CmCAT under cold stress. The results indicate that MT pretreatment alleviated the detrimental effects of cold stress and accelerateds the recovery mainly by enhancing photosynthesis and antioxidant capacity in melon leaves.
分类号: Q94
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