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Alleviation of exogenous 6-benzyladenine on two genotypes of eggplant (Solanum melongena Mill.) growth under salt stress

文献类型： 外文期刊

作者： Wu, Xuexia 1 ; He, Jie 3 ; Chen, Jianlin 1 ; Yang, Shaojun 1 ; Zha, Dingshi 1 ;

作者机构： 1.Shanghai Acad Agr Sci, Inst Hort Res, Shanghai 201403, Peoples R China

2.Shanghai Acad Agr Sci, Shanghai Key Lab Protected Hort Technol, Shanghai 201403, Peoples R China

3.Yangzhou Univ, Coll Biosci & Biotechnol, Yangzhou 225009, Peoples R China

关键词： Antioxidant system;6-Benzyladenine;Eggplant;Growth;Photosynthesis;Salt stress

期刊名称：PROTOPLASMA （ 影响因子：3.356； 五年影响因子：3.298 ）

ISSN： 0033-183X

年卷期： 2014 年 251 卷 1 期

页码：

收录情况： SCI

摘要： Cytokinins were recently shown to control plant adaptation to environmental stresses. To characterize the roles of cytokinins in the tolerance of eggplant (Solanum melongena Mill.) to salt stress, the protective effects of 6-benzyladenine (6-BA) on the growth, photosynthesis, and antioxidant capacity in the leaves of two eggplant cultivars Huqie12 (salt-sensitive) and Huqie4 (salt-tolerant) were investigated. Under 90 mM NaCl stress, Huqie4 showed higher biomass accumulation and less oxidative damage compared to the Huqie12. Application of exogenous 10 mu M 6-BA significantly alleviated the growth suppression caused by salt stress in two eggplant genotypes. In parallel with the growth, 6-BA application in salt-stressed plants resulted in enhanced chlorophyll contents, as well as photosynthetic parameters such as net CO2 assimilation rate (P (n)), stomatal conductance (g (s)), transpiration rate (E), and intercellular CO2 concentration (C (i)). Furthermore, exogenous 6-BA also significantly reduced the O-2 (-) production rate and malondialdehyde content and markedly increased the antioxidant enzymes superoxide dismutase and peroxidase, the antioxidant metabolites ascorbate and reduced glutathione (GSH), and proline in both genotypes under salt stress. The results indicate that exogenous 6-BA is useful to improve the salt resistance of eggplant, which is most likely related to the increase in photosynthesis and antioxidant capacity.

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