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AUXIN RESPONSE FACTOR 18–HISTONE DEACETYLASE 6 module regulates floral organ identity in rose (Rosa hybrida)

Chen, Jiwei; Li, Yang; Li, Yonghong; Li, Yuqi; Wang, Yi; Jiang, Chuyan; Choisy, Patrick; Xu, Tao; Cai, Youming; Pei, Dong; Jiang, Cai-Zhong; Gan, Su-Sheng; Gao, Junping; Ma, Nan

Authors

Jiwei Chen

Yang Li

Yonghong Li

Profile image of Yuqi Li

Dr Yuqi Li yuqi.li2@durham.ac.uk
Sponsored Researcher Post

Yi Wang

Chuyan Jiang

Patrick Choisy

Tao Xu

Youming Cai

Dong Pei

Cai-Zhong Jiang

Su-Sheng Gan

Junping Gao

Nan Ma



Abstract

The phytohormone auxin plays a pivotal role in floral meristem initiation and gynoecium development, but whether and how auxin controls floral organ identity remain largely unknown. Here, we found that auxin levels influence organ specification, and changes in auxin levels influence homeotic transformation between petals and stamens in rose (Rosa hybrida). The PIN-FORMED-LIKES (PILS) gene RhPILS1 governs auxin levels in floral buds during floral organogenesis. RhAUXIN RESPONSE FACTOR 18 (RhARF18), whose expression decreases with increasing auxin content, encodes a transcriptional repressor of the C-class gene RhAGAMOUS (RhAG), and controls stamen–petal organ specification in an auxin-dependent manner. Moreover, RhARF18 physically interacts with the histone deacetylase (HDA) RhHDA6. Silencing of RhHDA6 increases H3K9/K14 acetylation levels at the site adjacent to the RhARF18-binding site in the RhAG promoter and reduces petal number, indicating that RhARF18 might recruit RhHDA6 to the RhAG promoter to reinforce the repression of RhAG transcription. We propose a model for how auxin homeostasis controls floral organ identity via regulating transcription of RhAG

Citation

Chen, J., Li, Y., Li, Y., Li, Y., Wang, Y., Jiang, C., Choisy, P., Xu, T., Cai, Y., Pei, D., Jiang, C.-Z., Gan, S.-S., Gao, J., & Ma, N. (2021). AUXIN RESPONSE FACTOR 18–HISTONE DEACETYLASE 6 module regulates floral organ identity in rose (Rosa hybrida). Plant Physiology, 186(2), 1074-1087. https://doi.org/10.1093/plphys/kiab130

Journal Article Type Article
Acceptance Date Mar 1, 2021
Online Publication Date Mar 17, 2021
Publication Date Jun 11, 2021
Deposit Date Oct 20, 2024
Journal Plant Physiology
Print ISSN 0032-0889
Electronic ISSN 1532-2548
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 186
Issue 2
Pages 1074-1087
DOI https://doi.org/10.1093/plphys/kiab130
Public URL https://durham-repository.worktribe.com/output/2977949
Additional Information This article is open access via https://doi.org/10.1093/plphys/kiab130