articleProceedings of the National Academy of SciencesMay 6, 2009GREEN OA

Arabidopsis mutant deficient in 3 abscisic acid-activated protein kinases reveals critical roles in growth, reproduction, and stress

HFHiroaki FujiiJZJian‐Kang Zhu

University of California, Riverside · Cornell University

PubMed
Indexed incrossrefpubmed

Abstract

Abscisic acid (ABA) is an important phytohormone regulating seed dormancy, germination, seedling growth, and plant transpiration. We report here an Arabidopsis triple mutant that is disrupted in 3 SNF1-related protein kinase subfamily 2 (SnRK2s) and nearly completely insensitive to ABA. These SnRK2s, SnRK2.2, SnRK2.3, and SnRK2.6 (also known as OST1), are activated by ABA and can phosphorylate the ABA-responsive element binding factor family of b-ZIP transcription factors, which are important for the activation of ABA-responsive genes. Although stomatal regulation of snrk2.6 and seed germination and seedling growth of the snrk2.2/2.3 double mutant are insensitive to ABA, ABA responses are still present in…

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Topics & keywords

Topics
Keywords
  • Abscisic acid
  • Mutant
  • Arabidopsis
  • Biology
  • Cell biology
  • Protein kinase A
  • Arabidopsis thaliana
  • Kinase
UN Sustainable Development Goals
  • Clean water and sanitation
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