The water-water cycle is essential for chloroplast protection in the absence of stress.

@article{Rizhsky2003TheWC,
  title={The water-water cycle is essential for chloroplast protection in the absence of stress.},
  author={Ludmila Rizhsky and Hongjian Liang and Ron Mittler},
  journal={The Journal of biological chemistry},
  year={2003},
  volume={278 40},
  pages={38921-5}
}
Maintaining electron flow through the photosynthetic apparatus, even in the absence of a sufficient amount of NADP+ as an electron acceptor, is essential for chloroplast protection from photooxidative stress. At least two different pathways are thought to participate in this process, i.e. cyclic electron flow and the water-water cycle. Although the function of the water-water cycle was inferred from a number of biochemical and physiological studies, genetic evidence for the function of this… CONTINUE READING

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