Molecules and Cells

, Volume 27, Issue 4, pp 409–416

An ARIA-interacting AP2 domain protein is a novel component of ABA signaling

  • Sun-ji Lee
  • Dong-im Cho
  • Jung-youn Kang
  • Soo Young Kim
Article

DOI: 10.1007/s10059-009-0058-3

Cite this article as:
Lee, S., Cho, D., Kang, J. et al. Mol Cells (2009) 27: 409. doi:10.1007/s10059-009-0058-3

Abstract

ADAP is an AP2-domain protein that interacts with ARIA, which, in turn, interacts with ABF2, a bZIP class transcription factor. ABF2 regulates various aspects of the abscisic acid (ABA) response by controlling the expression of a subset of ABA-responsive genes. Our expression analyses indicate that ADAP is expressed in roots, emerging young leaves, and flowers. We found that adap knockout mutant lines germinate more efficiently than wild-type plants and that the mutant seedlings grow faster. This suggests that ADAP is involved in the regulation of germination and seedling growth. Both germination and post-germination growth of the knockout mutants were partially insensitive to ABA, which indicates that ADAP is required for a full ABA response. The survival rates for mutants from which water was withheld were low compared with those for wild-type plants. The result shows that ADAP is necessary for the response to stress induced by water deprivation. Together, our data indicate that ADAP is a positive regulator of the ABA response and is also involved in regulating seedling growth. The role of ADAP is similar to that of ARIA, which is also a positive regulator of the ABA response. It appears that ADAP acts through the same ABA response pathway as ARIA.

Keywords

Abscisic acid (ABA)ABFabiotic stressArm protein

Copyright information

© The Korean Society for Molecular and Cellular Biology and Springer Netherlands 2009

Authors and Affiliations

  • Sun-ji Lee
    • 1
  • Dong-im Cho
    • 1
  • Jung-youn Kang
    • 1
  • Soo Young Kim
    • 1
  1. 1.Department of Molecular Biotechnology and Kumho Life Science Laboratory, College of Agriculture and Life SciencesChonnam National UniversityGwangjuKorea