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Interplay between REVEILLE1 and RGA-LIKE2 regulates seed dormancy and germination in Arabidopsis

作 者:Yang LW, Jiang ZM, Liu SR, Lin RC*
影响因子: 7.299
刊物名称: New Phytologist
出版年份: 2019
卷:   期:    页码: DOI: 10.1111/nph.16236

文章摘要 : 

  • Environmental light signal and GAs synergistically regulate seed dormancy and germination. The phytochrome B (phyB) photoreceptor regulates expression of the REVEILLE1 (RVE1) transcription factor, which directly inhibits GIBBERELLIN 3OXIDASE2transcription, suppressing GA biosynthesis. However, whether phyBRVE1 coordinates with GA signaling in controlling seed dormancy and germination remains unknown.
  • Here, we demonstrate that RVE1 regulation of seed dormancy and germination requires a DELLA repressor, REPRESSOR OF GALIKE2 (RGL2), in Arabidopsis thaliana.
  • RVE1 interacts with both RGL2 and its E3 ubiquitin ligase SLEEPY1 (SLY1) and promotes RGL2 stability by restraining the RGL2–SLY1 interaction. Furthermore, RVE1 and RGL2 synergistically regulate global transcriptome changes; RGL2 enhances the DNAbinding capacity and transcriptional activity of RVE1 in regulating downstream gene expression. Moreover, RGL2 expression is repressed by phyB.
  • Our study reveals a novel regulatory mechanism in which the RVE1–RGL2 module coordinately controls seed dormancy and germination by integrating light perception, GA metabolism and GA signaling pathways.

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