Integration of Transcriptional Repression and Polycomb-Mediated Silencing of WUSCHEL in Floral Meristems

Arabidopsis ( ) floral meristems terminate after the carpel primordia arise. This is achieved through the temporal repression of ( ), which is essential for stem cell maintenance. At floral stage 6, is repressed by KNUCKLES (KNU), a repressor directly activated by AGAMOUS. KNU was suggested to repre...

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Published inThe Plant cell Vol. 31; no. 7; pp. 1488 - 1505
Main Authors Sun, Bo, Zhou, Yingying, Cai, Jie, Shang, Erlei, Yamaguchi, Nobutoshi, Xiao, Jun, Looi, Liang-Sheng, Wee, Wan-Yi, Gao, Xiuying, Wagner, Doris, Ito, Toshiro
Format Journal Article
LanguageEnglish
Published England American Society of Plant Biologists 01.07.2019
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Summary:Arabidopsis ( ) floral meristems terminate after the carpel primordia arise. This is achieved through the temporal repression of ( ), which is essential for stem cell maintenance. At floral stage 6, is repressed by KNUCKLES (KNU), a repressor directly activated by AGAMOUS. KNU was suggested to repress through histone deacetylation; however, how the changes in the chromatin state of are initiated and maintained to terminate the floral meristem remains elusive. Here, we show that KNU integrates initial transcriptional repression with polycomb-mediated stable silencing of After KNU is induced, it binds to the promoter and causes eviction of SPLAYED, which is a known activator of and can oppose polycomb repression. KNU also physically interacts with FERTILIZATION-INDEPENDENT ENDOSPERM, a key polycomb repressive complex2 component, and mediates the subsequent deposition of the repressive histone H3 lysine 27 trimethylation for stable silencing of This multi-step silencing of leads to the termination of floral stem cells, ensuring proper carpel development. Thus, our work describes a detailed mechanism for heritable floral stem cell termination in a precise spatiotemporal manner.
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The authors responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantcell.org) are: Bo Sun (sunbo@nju.edu.cn) and Toshiro Ito (itot@bs.naist.jp).
Current address: State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.
www.plantcell.org/cgi/doi/10.1105/tpc.18.00450
ISSN:1040-4651
1532-298X
DOI:10.1105/tpc.18.00450