MYB30 and ETHYLENE INSENSITIVE3 antagonistically modulate root hair growth in Arabidopsis

SUMMARY Root hair (RH) is essential for plant nutrient acquisition and the plant–environment communication. Here we report that transcription factors MYB30 and ETHYLENE INSENSITIVE3 (EIN3) modulate RH growth/elongation in Arabidopsis in an antagonistic way. The MYB30 loss‐of‐function mutant displays...

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Published in:The Plant journal : for cell and molecular biology 2021-04, Vol.106 (2), p.480-492
Main Authors: Xiao, Fei, Gong, Qianyuan, Zhao, Shuangshuang, Lin, Honghui, Zhou, Huapeng
Format: Article
Language:English
Subjects:
Arabidopsis
Complex formation
Elongation
Ethylene
ETHYLENE INSENSITIVE3 (EIN3)/EIN3‐LIKE1 (EIL1) and ROOT HAIR DEFECTIVE SIX‐LIKE4 (RSL4)
Genomes
Mutants
MYB30
root hair (RH)
Transcription factors
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Summary:SUMMARY Root hair (RH) is essential for plant nutrient acquisition and the plant–environment communication. Here we report that transcription factors MYB30 and ETHYLENE INSENSITIVE3 (EIN3) modulate RH growth/elongation in Arabidopsis in an antagonistic way. The MYB30 loss‐of‐function mutant displays enhanced RH length, whereas the RH elongation in MYB30‐overexpressing plants is highly repressed. MYB30 physically interacts with EIN3, a master transcription factor in ethylene signaling. MYB30 directly binds the promoter region of ROOT HAIR DEFECTIVE SIX‐LIKE4 (RSL4) and represses its transcription. RSL4 loss‐of‐function suppresses the enhanced RH growth in myb30 mutant plants. Ethylene enhances MYB30‐EIN3 complex formation, and reduces the association between MYB30 and RSL4 promotor via the action of EIN3. MYB30 and EIN3 antagonistically regulate the expression of RSL4 and a subset of core RH genes in a genome‐wide way. Taken together, our work revealed a novel transcriptional network that modulates RH growth in plants. Significance Statement MYB30‐EIN3 module is novel regulator of RH growth in plants.
ISSN:0960-7412
1365-313X
DOI:10.1111/tpj.15180