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Hydrogen sulphide alleviates oxidative damage and enhances light energy transformation under high light for Dendrobium officinale

文献类型： 外文期刊

作者： Fan, Honghong 1 ; Guan, Lei 1 ; Li, Tingchun 1 ; Wu, Qiuju 1 ; Wu, Meijuan 1 ; Cai, Yongping 1 ; Lin, Yi 1 ;

作者机构： 1.Anhui Agr Univ, Dept Life Sci, Hefei 230036, Peoples R China

2.Anhui Acad Agr Sci, Hefei 230031, Peoples R China

关键词： Dendrobium officinale;High light stress;Hydrogen sulphide;Photoinhibition

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：3.463； 五年影响因子：3.672 ）

ISSN：

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收录情况： SCI

摘要： Hydrogen sulphide (H2S) is an important biological messenger in plants, which has been implicated in response to abiotic stress. To study the effects of H2S on plant under high light menace, the seedlings of Dendrobium officinale were selected and treated with high light (800 mu mol m(-2) s(-1)) to simulate photoinhibition. After application of sodium hydrogen sulphide (NaHS), the antioxidant enzyme activities and chlorophyll fluorescence parameters were determined. The results showed that the plant supplied with 200 mu mol L-1 NaHS maintained higher activities of antioxidant enzymes and lower content of malondialdehyde (MDA) during high light treatment. However, higher concentration of NaHS (600 mu mol L-1) enhanced the effects of high light stress for plant. For further analysis of the response mechanism against to high light, the chlorophyll fluorescence parameters were determined. As a result, when the seedlings were treated with 200 mu mol L-1 NaHS, levels of chlorophyll parameters: Fv/Fm, Phi(PSII), Phi(NPQ), qP, qL, NPQ and ETR were obviously increased. The parameter Phi(NO) was maintained lower. 200 mu mol L-1 NaHS treatment alleviated the photoinhibition and preserved the PSII from the photodamage. Contrarily, 600 mu mol L-1 NaHS treatment enhanced the photoinhibition and photodamage to PSII. Thus, the protection effect on plant under high light stress depends on the concentrations of H2S. These results may imply that 200 mu mol L-1 NaHS treatment triggered increase of antioxidant enzyme activities, which may be the reason that H2S could protect PSII against oxidative damage caused by high light

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