MED8 regulates floral transition in Arabidopsis by interacting with FPA

Author:

Yuan Chen1,Hu Yikai1,Liu Qinggang1,Xu Jingya1,Zhou Wei2,Yu Hao23ORCID,Shen Lisha2,Qin Cheng1ORCID

Affiliation:

1. College of Life and Environmental Sciences, Hangzhou Normal University Hangzhou 311121 China

2. Temasek Life Sciences Laboratory National University of Singapore 117604 Singapore

3. Department of Biological Sciences, Faculty of Science National University of Singapore 117543 Singapore

Abstract

SUMMARYSuccess in plant reproduction is highly dependent on the correct timing of the floral transition, which is tightly regulated by the flowering pathways. In the model plant Arabidopsis thaliana, the central flowering repressor FLOWERING LOCUS C (FLC) is precisely regulated by multiple flowering time regulators in the vernalization pathway and autonomous pathway, including FPA. Here we report that Arabidopsis MEDIATOR SUBUNIT 8 (MED8) promotes floral transition in Arabidopsis by recruiting FPA to the FLC locus to repress FLC expression. Loss of MED8 function leads to a significant late‐flowering phenotype due to increased FLC expression. We further show that MED8 directly interacts with FPA in the nucleus and recruits FPA to the FLC locus. Moreover, MED8 is indispensable for FPA's function in controlling flowering time and regulating FLC expression. Our study thus reveals a flowering mechanism by which the Mediator subunit MED8 represses FLC expression by facilitating the binding of FPA to the FLC locus to ensure appropriate timing of flowering for reproductive success.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

Cell Biology,Plant Science,Genetics

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