期刊
PLANT CELL AND ENVIRONMENT
卷 41, 期 11, 页码 2678-2692出版社
WILEY
DOI: 10.1111/pce.13393
关键词
ABA; anthocyanin; bZIP transcription factor; MdBT2; MdMYB1; ubiquitination
资金
- National Natural Science Foundation of China [31471854, 31601742]
- Ministry of Agriculture of China [CARS-27, 2016-X11]
- Shandong Province Government [SDAIT-06-03]
- Ministry of Education of China [IRT15R42]
Phytohormone abscisic acid (ABA) induces anthocyanin biosynthesis; however, the underlying molecular mechanism is less known. In this study, we found that the apple MYB transcription factor MdMYB1 activated anthocyanin biosynthesis in response to ABA. Using a yeast screening technique, we isolated MdbZIP44, an ABA-induced bZIP transcription factor in apple, as a co-partner with MdMYB1. MdbZIP44 promoted anthocyanin accumulation in response to ABA by enhancing the binding of MdMYB1 to the promoters of downstream target genes. Furthermore, we identified MdBT2, a BTB protein, as an MdbZIP44-interacting protein. A series of molecular, biochemical, and genetic analysis suggested that MdBT2 degraded MdbZIP44 protein through the Ubiquitin-26S proteasome system, thus inhibiting MdbZIP44-modulated anthocyanin biosynthesis. Taken together, we reveal a novel working mechanism of MdbZIP44-mediated anthocyanin biosynthesis in response to ABA.
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