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The identification of genes involved in the stomatal response to reduced atmospheric relative humidity.

Research output: Contribution to journalJournal article

Published

  • Xiaodong D. Xie
  • Yibing B. Wang
  • Lisa Williamson
  • Geoff H. Holroyd
  • Cecilia Tagliavia
  • Erik Murchie
  • Julian C. Theobald
  • Marc R. Knight
  • William J. Davies
  • H. M. Ottoline Leyser
  • Alistair M. Hetherington
Journal publication date9/05/2006
JournalCurrent Biology
Journal number9
Volume16
Number of pages6
Pages882-887
Original languageEnglish

Abstract

Stomatal pores of higher plants close in response to decreases in atmospheric relative humidity (RH). This is believed to be a mechanism that prevents the plant from losing excess water when exposed to a dry atmosphere and as such is likely to have been of evolutionary significance during the colonization of terrestrial environments by the embryophytes. We have conducted a genetic screen, based on infrared thermal imaging, to identify Arabidopsis genes involved in the stomatal response to reduced RH. Here we report the characterization of two genes, identified during this screen, which are involved in the guard cell reduced RH signaling pathway. Both genes encode proteins known to be involved in guard cell ABA signaling. OST1 encodes a protein kinase involved in ABA-mediated stomatal closure while ABA2 encodes an enzyme involved in ABA biosynthesis. These results suggest, in contrast to previously published work, that ABA plays a role in the signal transduction pathway connecting decreases in RH to reductions in stomatal aperture. The identification of OST1 as a component required in stomatal RH and ABA signal transduction supports the proposition that guard cell signaling is organized as a network in which some intracellular signaling proteins are shared among different stimuli.