Molecular characterization of an AtPYL1-like protein, BrPYL1, as a putative ABA receptor in Brassica rapa

Biochem Biophys Res Commun. 2017 Jun 3;487(3):684-689. doi: 10.1016/j.bbrc.2017.04.116. Epub 2017 Apr 24.

Abstract

Abscisic acid (ABA)-induced physiological changes are conserved in many land plants and underlie their responses to environmental stress and pathogens. The PYRABACTIN RESISTANCE1/PYR1-LIKE/REGULATORY COMPONENTS OF ABA RECEPTORS (PYLs)-type receptors perceive the ABA signal and initiate signal transduction. Here, we show that the genome of Brassica rapa encodes 24 putative AtPYL-like proteins. The AtPYL-like proteins in Brassica rapa (BrPYLs) can also be classified into 3 subclasses. We found that nearly all BrPYLs displayed high expression in at least one tissue. Overexpression of BrPYL1 conferred ABA hypersensitivity to Arabidopsis. Further, ABA activated the expression of an ABA-responsive reporter in Arabidopsis protoplasts expressing BrPYL1. Overall, these results suggest that BrPYL1 is a putative functional ABA receptor in Brassica rapa.

Keywords: ABA receptor; ABA signalling; BrPYL1; PYR/PYL/RCAR; Reconstitution.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Abscisic Acid / genetics*
  • Arabidopsis / genetics*
  • Arabidopsis Proteins / genetics*
  • Brassica rapa / genetics*
  • Receptors, Cell Surface / genetics*
  • Species Specificity

Substances

  • Arabidopsis Proteins
  • Receptors, Cell Surface
  • Abscisic Acid