Gibberellins negatively regulate low temperature-induced anthocyanin accumulation in a HY5/HYH-dependent manner

Plant Signal Behav. 2011 May;6(5):632-4. doi: 10.4161/psb.6.5.14343. Epub 2011 May 1.

Abstract

Low temperature could significantly induce anthocyanin accumulation in the presence of light. Recently, two bZIP transcription factors LONG HYPOCOTYL 5 (HY5) and HOMOLOG OF HY5 (HYH) were identified to play an important role in the process of low temperature-induced anthocyanin accumulation. However, the mechanism by which HY5/HYH regulates anthocyanin accumulation under low temperature still remains unclear. Here, we found that the gibberellins (GAs) could decrease but PAC (endogenous GAs biosynthesis inhibitor) increase the low temperature-induced anthocyanin accumulation, implying that GAs signaling may involve in this process. Furthermore, the transcript levels of GA2ox1, encoding a major member of bioactive GAs-deactivating enzymes, were significantly up-regulated by low temperature in a HY5/HYH-dependent manner. Moreover, hy5hyh mutant was insensitive to PAC in enhancing anthocyanin accumulation under low temperature. From these data we propose that, together with HY5/HYH, GA signaling may play an important role during low temperature-induced anthocyanin accumulation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anthocyanins / metabolism
  • Arabidopsis / drug effects
  • Arabidopsis / enzymology
  • Arabidopsis / genetics
  • Arabidopsis Proteins / genetics
  • Arabidopsis Proteins / metabolism*
  • Basic-Leucine Zipper Transcription Factors / metabolism*
  • Carrier Proteins / metabolism*
  • Cold Temperature*
  • DNA-Binding Proteins
  • Gene Expression Regulation, Plant / drug effects
  • Gibberellins / pharmacology
  • Models, Biological
  • Nuclear Proteins / metabolism*

Substances

  • Anthocyanins
  • Arabidopsis Proteins
  • Basic-Leucine Zipper Transcription Factors
  • Carrier Proteins
  • DNA-Binding Proteins
  • Gibberellins
  • HY5 protein, Arabidopsis
  • HYH protein, Arabidopsis
  • Nuclear Proteins