Effects of cytokinin on photosynthetic gas exchange, chlorophyll fluorescence parameters and antioxidative system in seedlings of eggplant (Solanum melongena L.) under salinity stress
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- 作者：Xuexia Wu (1)
Zongwen Zhu (1)
Xian Li (1)
Dingshi Zha (1) - 关键词：6 ; BA ; Photosynthetic gas exchange ; Chlorophyll fluorescence ; Antioxidant enzymes ; Oxidative damage ; Eggplant ; Salt stress
- 刊名：Acta Physiologiae Plantarum
- 出版年：2012
- 出版时间：November 2012
- 年：2012
- 卷：34
- 期：6
- 页码：2105-2114
- 全文大小：358KB
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Zongwen Zhu (1)
Xian Li (1)
Dingshi Zha (1)
1. Horticultural Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai Key Laboratory of Protected Horticultural Technology, 201106, Shanghai, China
文摘
The effects of 6-benzyladenine (6-BA) on plant growth, photosynthetic gas exchange, chlorophyll fluorescence and antioxidant systems of eggplant (Solanum melongena L.) under salt stress were investigated. Eggplant seedlings were exposed to 90?mM NaCl with four levels of 6-BA (5, 10, 20 and 50?μM) for 10?days. 6-BA at lower concentrations increased chlorophyll concentration, the net photosynthetic rate (P N), stomatal conductance (g s), and transpiration rate (E), intercellular CO2 concentration (C i) and water use efficiency (WUE), as well as the quantum efficiency of PSII photochemistry (ΦPSII), photochemical quenching (q p), and decreased non-photochemical quenching (NPQ), while higher concentrations reduced the effects or even exacerbated the occurrence of photosynthetic capacity. The activities of antioxidant enzymes such as superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), and ascorbate peroxidase (APX) increased significantly during salt treatments, and induced the increase of the activities of these enzymes at certain concentrations of 6-BA. 6-BA also reduced significantly malonaldehyde (MDA) contents and O 2 ·?/sup> production. It was concluded that 6-BA could alleviate the detrimental effects of salt stress on plant growth by increasing photosynthetic efficiency and enhancing antioxidant enzyme systems in leaves at a proper concentration and of the varying 6-BA concentrations used, the most effective concentration for promoting growth was 10?μM under saline conditions.