The DELLA proteins interact with MYB21 and MYB24 to regulate filament elongation in Arabidopsis

BACKGROUND: Gibberellin (GA) and jasmonate (JA) are two essential phytohormones for filament elongation in Arabidopsis. GA and JA trigger degradation of DELLAs and JASMONATE ZIM-domain (JAZ) proteins through SCF(SLY1) and SCF(COI1) separately to activate filament elongation. In JA pathway, JAZs inte...

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Detalles Bibliográficos
Autores principales: Huang, Huang, Gong, Yilong, Liu, Bei, Wu, Dewei, Zhang, Min, Xie, Daoxin, Song, Susheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2020
Materias:
Research Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7006197/
https://www.ncbi.nlm.nih.gov/pubmed/32033528
http://dx.doi.org/10.1186/s12870-020-2274-0
Descripción
Sumario:BACKGROUND: Gibberellin (GA) and jasmonate (JA) are two essential phytohormones for filament elongation in Arabidopsis. GA and JA trigger degradation of DELLAs and JASMONATE ZIM-domain (JAZ) proteins through SCF(SLY1) and SCF(COI1) separately to activate filament elongation. In JA pathway, JAZs interact with MYB21 and MYB24 to control filament elongation. However, little is known how DELLAs regulate filament elongation. RESULTS: Here we showed that DELLAs interact with MYB21 and MYB24, and that R2R3 domains of MYB21 and MYB24 are responsible for interaction with DELLAs. Furthermore, we demonstrated that DELLA and JAZ proteins coordinately repress the transcriptional function of MYB21 and MYB24 to inhibit filament elongation. CONCLUSION: We discovered that DELLAs interact with MYB21 and MYB24, and that DELLAs and JAZs attenuate the transcriptional function of MYB21 and MYB24 to control filament elongation. This study reveals a novel cross-talk mechanism of GA and JA in the regulation of filament elongation in Arabidopsis.

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