Brassinosteroid Enhances Jasmonate-Induced

Anthocyanin Accumulation in Arabidopsis Seedlings

Zhihong Peng et al 2011, J. of Int. Plant Bio.  

The paper presented here the physiological evidences of the involvement of Brassinosteroid in the jamonate induced anthocyanin accumulation in Arabidopsis. Mutation in BR biosynthesis gene DWF4 and exogenous application of brassinazole reduced the JA induced anthocyanin accumulation. In contrast, exogenous application of BR enhanced JA induced anthocyanin accumulation which depends on proper BR signaling since BR signaling mutant bri1-4 accumulated lesser quantity of anthocyanin with or without JA compared to wild type in the respective condition. In search of the regulation mechanism for the BR JA interaction in anthocyanin accumulation, authors tested the transcription level of the anthocyanin biosynthesis genes and the transcriptional factors regulating the biosynthesis genes. They found that the expression of late anthocyanin biosynthesis genes DFR, LDOX, and UF3GT were highly decreased in dwf4-102 and bri1-4 mutant compared to wild type after JA application. Moreover, the transcriptional factors PAP1, PAP2, and GL3 expression was reduced in BR biosynthetic and signaling mutant.