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  • Title: Role of farnesyltransferase in ABA regulation of guard cell anion channels and plant water loss.
    Author: Pei ZM, Ghassemian M, Kwak CM, McCourt P, Schroeder JI.
    Journal: Science; 1998 Oct 09; 282(5387):287-90. PubMed ID: 9765153.
    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 gene ERA1 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 era1 suppresses the ABA-insensitive phenotypes. Moreover, era1 plants exhibited a reduction in transpirational water loss during drought treatment.
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