Journal
FEBS LETTERS
Volume 583, Issue 18, Pages 2982-2986Publisher
WILEY
DOI: 10.1016/j.febslet.2009.08.033
Keywords
Abscisic acid; Guard cell; Protein kinase; Reactive oxygen species
Funding
- NRI [2004-35100-14909, 2007-35100-18377]
- NSF [MCB-0618402]
- French Ministere de l'Enseignement Superieur et de la Recherche
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The plant hormone abscisic acid (ABA) triggers production of reactive oxygen species (ROS) in guard cells via the AtrbohD and AtrbohF NADPH oxidases, leading to stomatal closure. The ABA-activated SnRK2 protein kinase open stomata 1 (OST1) (SRK2E/SnRK2.6) acts upstream of ROS in guard cell ABA signaling. Here, we report that OST1 phosphorylates Ser13 and Ser174 on AtrbohF. In addition, substitution of Ser174 to Ala results in a similar to 40% reduction in the phosphorylation of AtrbohF by OST1. We also show that OST1 physically interacts with AtrbohF. These results provide biochemical evidence suggesting that OST1 regulates AtrbohF activity.
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