›› 2019, Vol. 31 ›› Issue (4): 556-564.DOI: 10.3969/j.issn.1004-1524.2019.04.07

• Horticultural Science • Previous Articles     Next Articles

Effects of exogenous melatonin on physiological characteristics of 5BB grape leaves under NaCl stress

HAN Guomin1, LIU Xi1, TANG Meiling2, DAI Lingmin1,*   

  1. 1. School of Pharmacy, Binzhou Medical University, Yantai 264003, China;
    2. Institute of Grape and Wine, Yantai Academy of Agricultural Sciences, Yantai 265500, China
  • Received:2018-09-03 Online:2019-04-25 Published:2019-04-19

Abstract: The detached leaves of grape rootstocks 5BB were used to study the effects of exogenous melatonin (100, 200 and 500 nmol·L-1) on photosynthesis and related physiological indicators under NaCl (0.25 mol·L-1) stress, with the petiole immersed in the mixed solution of melatonin and NaCl during the six days' treatment. The results showed that exogenous melatonin increased superoxide dismutase (SOD) activity to scavenge free oxygen radical accumulated in leaves under NaCl stress, and blocked membrane lipid peroxidation to improve the photosynthetic pigment content and photosynthetic capacity of grape leaves under stress; Furthermore, the protective effects of exogenous melatonin decreased with the increase of melatonin concentration. Thus, exogenous melatonin could alleviate the damage by NaCl stress in 5BB,and 100 nmol·L-1 was the proper concentration.

Key words: grape, leaf, exogenous melatonin, NaCl stress, physiological index

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