J Integr Plant Biol. ›› 2011, Vol. 53 ›› Issue (8): 632-640.DOI: 10.1111/j.1744-7909.2011.01042.x

Special Issue: Plant Signal Transduction

• Plant-environmental Interactions • Previous Articles     Next Articles

Brassinosteroid Enhances Jasmonate-Induced Anthocyanin Accumulation in Arabidopsis Seedlings

Zhihong Peng1,2†, Chengyun Han2†, Libing Yuan2, Kun Zhang2, Hongman Huang2 and Chunmei Ren1,2*   

  1. 1Hunan Provincial Key Laboratory of Crop Germplasm Innovation and Utilization, Hunan Agricultural University, Changsha 410128, China
    2College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, China
  • Received:2011-02-15 Accepted:2011-04-17 Published:2011-08-01
  • About author:*Corresponding author. Tel: +86 731 8461 7380; Fax: +86 731 8463 5290; E-mail: rencm66@163.com
    These authors contributed equally to this work.

Abstract:

Jasmonate (JA) regulates plant development, mediates defense responses, and induces anthocyanin biosynthesis as well. Previously, we isolated the psc1 mutant that partially suppressed coi1 insensitivity to JA, and found that brassinosteroid (BR) was involved in JA signaling and negatively regulated JA inhibition of root growth in Arabidopsis. In this study it was shown that JA-induced anthocyanin accumulation was reduced in BR mutants or in wild type treated with brassinazole, an inhibitor of BR biosynthesis, whereas it was induced by an application of exogenous BR. It was also shown that the ‘late’ anthocyanin biosynthesis genes including DFR, LDOX, and UF3GT, were induced slightly by JA in the BR mutants relative to wild type. Furthermore, the expression level of JA-induced Myb/bHLH transcription factors such as PAP1, PAP2, and GL3, which are components of the WD-repeat/Myb/bHLH transcriptional complexes that mediate the ‘late’ anthocyanin biosynthesis genes, was lower in the BR mutants than that in wild type. These results suggested that BR affects JA-induced anthocyanin accumulation by regulating the ‘late’ anthocyanin biosynthesis genes and this regulation might be mediated by the WD-repeat/Myb/bHLH transcriptional complexes.

Peng Z, Han C, Yuan L, Zhang K, Huang H, Ren C (2011) Brassinosteroid enhances jasmonate-induced anthocyanin accumulation in Arabidopsis seedlings. J. Integr. Plant Biol. 53(8), 632–640.

Key words: biosynthesis, brassinosteroid, crosstalk, signaling, transcription

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