Deficient glutathione in guard cells facilitates abscisic acid-induced stomatal closure but does not affect light-induced stomatal opening.

@article{Jahan2008DeficientGI,
  title={Deficient glutathione in guard cells facilitates abscisic acid-induced stomatal closure but does not affect light-induced stomatal opening.},
  author={Md Sarwar Jahan and Ken'ichi Ogawa and Yoshimasa Nakamura and Yasuaki Shimoishi and Izumi C. Mori and Yoshiyuki Murata},
  journal={Bioscience, biotechnology, and biochemistry},
  year={2008},
  volume={72 10},
  pages={2795-8}
}
We investigated the role of glutathione (GSH) in stomatal movements using a GSH deficient mutant, chlorinal-1 (ch1-1). Guard cells of ch1-1 mutants accumulated less GSH than wild types did. Light induced stomatal opening in ch1-1 and wild-type plants. Abscisic acid (ABA) induced stomatal closure in ch1-1 mutants more than wild types without enhanced reactive oxygen species (ROS) production. Therefore, GSH functioned downstream of ROS production in the ABA signaling cascade. 

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