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Effects of exogenous melatonin on the growth and cadmium accumulation of lettuce under cadmium-stress conditions

文献类型： 外文期刊

作者： Tang, Wen 1 ; Liang, Le 1 ; Li, Rulong 2 ; Xie, Yongdong 3 ; Li, Xiaomei 4 ; Li, Huanxiu 6 ; Lin, Lijin 6 ; Huang, Zhi 1 ; Sun, Bo 1 ; Sun, Guochao 1 ; Tu, Lihua 7 ; Tang, Yi 6 ;

作者机构： 1.Sichuan Agr Univ, Coll Hort, Chengdu, Sichuan, Peoples R China

2.Serv Ctr Minjiang Modern Agr Demonstrat Pk, Meishan, Sichuan, Peoples R China

3.Chengdu Acad Agr & Forestry Sci, Chengdu, Sichuan, Peoples R China

4.Vegetable Germplasm Innovat & Variety Improvement, Chengdu, Sichuan, Peoples R China

5.Sichuan Acad Agr Sci, Rice & Sorghum Res Inst, Deyang, Sichuan, Peoples R China

6.Sichuan Agr Univ, Inst Pomol & Olericulture, Chengdu, Sichuan, Peoples R China

7.Sichuan Agr Univ, Coll Forestry, Chengdu, Sichuan, Peoples R China

关键词： cadmium; exogenous melatonin; growth; lettuce; photosynthesis

期刊名称：ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY （ 影响因子：2.824； 五年影响因子：2.587 ）

ISSN： 1944-7442

年卷期：

页码：

收录情况： SCI

摘要： Melatonin (MT) is a signaling molecule that is widely present in plants and can help them resist abiotic stresses. In this study, the effects of different concentrations of exogenous MT on the growth and development of lettuce (Lactuca sativa) under cadmium stress (50 mu mol/L) were investigated. Based on their Cd accumulation differences, the "Hong Feng" and "Luo Ma" lettuce cultivars were selected as research materials. The results showed that different concentrations of MT could promote the growth of lettuce under 50 mu mol/L cadmium stress. The application of exogenous melatonin can significantly increase the plant height, biomass, chlorophyll, soluble protein and soluble sugar content of lettuce, and increase the net photosynthetic rate. MT could also reduce the malondialdehyde content in lettuce under cadmium stress and increase the activities of superoxide dismutase, peroxidase, and catalase activities. After treatment with different concentrations of MT, the Cd content in the shoots of both cultivars significantly decreased; in contrast, the Cd content in the roots was significantly increased, which limited the transport of Cd from underground to the shoots. In addition, both Cd stress and exogenous MT induced the synthesis of endogenous MT, and 50 mu mol/L MT treatment most effectively induced this response. In conclusion, this study demonstrated that MT could alleviate the negative effects of Cd stress on lettuce with different Cd accumulation differences in terms of physiological indicators. Therefore, it provides a certain reference for the potential of MT to be applied to crops threatened by heavy metals.

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