Hydrogen sulfide alleviates aluminum toxicity in barley seedlings
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Aluminum (Al) toxicity is one of the major factors that limit plant growth. Low concentration of hydrogen sulfide (H2S) has been proven to function in physiological responses to various stresses. The objective of this study is to investigate the possible role of H2S in Al toxicity in barley (Hordeum vulgare L) seedlings.
Barley seedlings pre-treated with sodium hydrosulfide (NaHS), a H2S donor, and subsequently exposed to Al treatment were studied for their effects on root elongation, Al accumulation in seedlings, Al-induced citrate secretion and oxidative stress, and plasma membrane (PM) H+-ATPase expression.
Our results showed that H2S had significant rescue effects on Al-induced inhibition of root elongation which was correlated well with the decrease of Al accumulation in seedlings. Meanwhile, Al-induced citrate secretion was also significantly enhanced by NaHS pretreatment. Al-induced oxidative stress as indicated by lipid peroxidation and reactive oxygen species burst was alleviated by H2S through the activation of the antioxidant system. Moreover, Al-induced reduction in PM H+-ATPase expression was reversed by exogenous NaHS.
Altogether, our results suggest H2S plays an ameliorative role in protecting plants against Al toxicity by inducing the activities of antioxidant enzymes, increasing citrate secretion and citrate transporter gene expression, and enhancing the expression of PM H+-ATPase.
KeywordsAluminum toxicity Citrate secretion H+-ATPase Hydrogen sulfide Oxidative stress Root elongation
We are grateful to Bing-Bo Li, Duan-Ye Xiong, Xiang Liu and Jing Huang for assistance in experiments, and Mr. Sieh Sorie Kargbo for critically reading the manuscript. This study was financially supported by the Natural Science Foundation of China (NSFC) (30930076, 30770192, 30670317), the Foundation of the Chinese Ministry of Education (20070384033), the Program for New Century Excellent Talents in Xiamen University (NCETXMU X071l5) and a Changjiang Scholarship (X09111), the Scholarship award for excellent doctoral student granted by Ministry of Education.
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