METHYLENE BLUE SENSITIVITY 1 (MBS1) is required for acclimation of Arabidopsis to singlet oxygen and acts downstream of β-cyclocitral

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• 作者：Leonard Shumbe ; Stefano D'Alessandro ; Ning Shao ; Anne Chevalier ; Brigitte Ksas ; Ralph Bock and Michel Havaux
• 刊名：Plant, Cell & Environment
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：40
• 期：2
• 页码：216-226
• 全文大小：1990K
• ISSN：1365-3040

文摘

Singlet oxygen (¹O₂) signalling in plants is essential to trigger both acclimatory mechanisms and programmed cell death under high light stress. However, because of its chemical features, ¹O₂ requires mediators, and the players involved in this pathway are largely unknown. The β-carotene oxidation product, β-cyclocitral, is one such mediator. Produced in the chloroplast, β-cyclocitral induces changes in nuclear gene expression leading to photoacclimation. Recently, the METHYLENE BLUE SENSITIVITY protein MBS has been identified as a key player in ¹O₂ signalling leading to tolerance to high light. Here, we provide evidence that MBS1 is essential for acclimation to ¹O₂ and cross-talks with β-cyclocitral to mediate transfer of the ¹O₂ signal to the nucleus, leading to photoacclimation. The presented results position MBS1 downstream of β-cyclocitral in ¹O₂ signalling and suggest an additional role for MBS1 in the regulation of plant growth and development under chronic ¹O₂ production.