Report

Role of Farnesyltransferase in ABA Regulation of Guard Cell Anion Channels and Plant Water Loss

+ See all authors and affiliations

Science  09 Oct 1998:
Vol. 282, Issue 5387, pp. 287-290
DOI: 10.1126/science.282.5387.287

You are currently viewing the abstract.

View Full Text

Abstract

Desiccation of plants during drought can be detrimental to agricultural production. The phytohormone abscisic acid (ABA) reduces water loss by triggering stomatal pore closure in leaves, a process requiring ion-channel modulation by cytoplasmic proteins. Deletion of the Arabidopsis farnesyltransferase geneERA1 or application of farnesyltransferase inhibitors resulted in ABA hypersensitivity of guard cell anion-channel activation and of stomatal closing. ERA1 was expressed in guard cells. Double-mutant analyses of era1 with the ABA-insensitive mutants abi1 and abi2 showed that era1suppresses the ABA-insensitive phenotypes. Moreover, era1plants exhibited a reduction in transpirational water loss during drought treatment.

  • * To whom correspondence should be addressed at Department of Biology, University of California, San Diego, La Jolla, CA 92093–0116, USA. E-mail: julian{at}biomail.ucsd.edu

View Full Text

Related Content