• Physiological roles of plastid terminal oxidase in plant stress responses

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    • Keywords

       

      Carotenoid synthesis; chlororespiration; environmental stresses; photoprotection; photosynthesis; plastid terminal oxidase (PTOX)

    • Abstract

       

      The plastid terminal oxidase (PTOX) is a plastoquinol oxidase localized in the plastids of plants. It is able to transfer electrons from plastoquinone (PQ) to molecular oxygen with the formation of water. Recent studies have suggested that PTOX is beneficial for plants under environmental stresses, since it is involved in the synthesis of photoprotective carotenoids and chlororespiration, which could potentially protect the chloroplast electron transport chain (ETC) from over-reduction. The absence of PTOX in plants usually results in photo-bleached variegated leaves and impaired adaptation to environment alteration. Although PTOX level and activity has been found to increase under a wide range of stress conditions, the functions of plant PTOX in stress responses are still disputed now. In this paper, the possible physiological roles of PTOX in plant stress responses are discussed based on the recent progress.

    • Author Affiliations

       

      Xin Sun1 Tao Wen1

      1. Agronomy College, Chengdu Campus, Sichuan Agricultural University, Chengdu 611130, China
    • Dates

       
  • Journal of Biosciences | News

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