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Regulation of Abscisic Acid-Induced Stomatal Closure and Anion Channels by Guard Cell AAPK Kinase

Science  14 Jan 2000:
Vol. 287, Issue 5451, pp. 300-303
DOI: 10.1126/science.287.5451.300

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Abstract

Abscisic acid (ABA) stimulates stomatal closure and thus supports water conservation by plants during drought. Mass spectrometry–generated peptide sequence information was used to clone a Vicia faba complementary DNA, AAPK, encoding a guard cell–specific ABA-activated serine-threonine protein kinase (AAPK). Expression in transformed guard cells of AAPK altered by one amino acid (lysine 43 to alanine 43) renders stomata insensitive to ABA-induced closure by eliminating ABA activation of plasma membrane anion channels. This information should allow cell-specific, targeted biotechnological manipulation of crop water status.

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