The Possible Role of Alternative Oxidase in Jatropha curcas L. Responses to Salt Stress

Abstract

Abstract: Jatropha curcas L. is a stress-resistant oil species and can growth well in lands with low-rainfall harsh climate conditions. However, the mechanism of Jatropha curcas L. tolerance to adverse environment conditions is still unclear. In this study, the role of alternative oxidase（AOX）in Jatropha curcas L. response to salt stress was investigated. The results showed that Jatropha curcas L. was good tolerance to 200 mmol/L and 400 mmol/L NaCl stresses, and no significant differences in chlorophyll contents and water contents between treated and untreated control plants. 1 mol/L NaCl treatment obviously suppressed plant growth and leaf development, reduced leaf stomatal conductance, but no serious oxidative damages were shown. Moreover, it should be noted that AOX pathway respiration and AOX gene transcription was induced markedly under salt stresses. Compared with control plants, AOX transcription increased two-fold in response to 200 mmol/L and 400 mmol/L salt treatments, and increased three-fold under 1 mol/L NaCl treatment. Therefore, it hypothesis that AOX plays an important role in Jatropha curcas L. salt stress tolerance.

Key words: Jatropha curcas, L. Alternative oxidase, Salt stress, Oxidative damage

Yu Lulu, Wu Yangchen, Wang Jingjing, Wei Qian, Xu Fei. The Possible Role of Alternative Oxidase in Jatropha curcas L. Responses to Salt Stress[J]. Biotechnology Bulletin, 2014, 0(7): 112-118.

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