SUPERMAN regulates floral whorl boundaries through control of auxin biosynthesis

The EMBO Journal
Yifeng XuToshiro Ito

Abstract

Proper floral patterning, including the number and position of floral organs in most plant species, is tightly controlled by the precise regulation of the persistence and size of floral meristems (FMs). In Arabidopsis, two known feedback pathways, one composed of WUSCHEL (WUS) and CLAVATA3 (CLV3) and the other composed of AGAMOUS (AG) and WUS, spatially and temporally control floral stem cells, respectively. However, mounting evidence suggests that other factors, including phytohormones, are also involved in floral meristem regulation. Here, we show that the boundary gene SUPERMAN (SUP) bridges floral organogenesis and floral meristem determinacy in another pathway that involves auxin signaling. SUP interacts with components of polycomb repressive complex 2 (PRC2) and fine-tunes local auxin signaling by negatively regulating the expression of the auxin biosynthesis genes YUCCA1/4 (YUC1/4). In sup mutants, derepressed local YUC1/4 activity elevates auxin levels at the boundary between whorls 3 and 4, which leads to an increase in the number and the prolonged maintenance of floral stem cells, and consequently an increase in the number of reproductive organs. Our work presents a new floral meristem regulatory mechanism, in which S...Continue Reading

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Citations

Feb 13, 2019·Journal of Experimental Botany·Grace L ChongloiUsha Vijayraghavan
Mar 28, 2019·Journal of Experimental Botany·Yifeng XuToshiro Ito
Aug 30, 2019·Plant Signaling & Behavior·Erlei ShangBo Sun
Sep 12, 2018·International Journal of Molecular Sciences·Tianqi Lyu, Jiashu Cao
Aug 23, 2019·International Journal of Molecular Sciences·Ze Hong LeeToshiro Ito
Jan 11, 2020·Frontiers in Plant Science·Yongping LiChunying Kang
May 10, 2020·Journal of Experimental Botany·Nathanaël Prunet, Keith Duncan
Oct 23, 2019·Biomolecules·Eduardo Mateo-BonmatíKarin Ljung
Dec 13, 2018·Nature Communications·Nobutoshi YamaguchiToshiro Ito
Nov 12, 2020·The Plant Journal : for Cell and Molecular Biology·Ana L RodasLuis A Cañas
Dec 24, 2020·Cold Spring Harbor Perspectives in Biology·Mara CucinottaLucia Colombo
Jan 13, 2021·Cold Spring Harbor Perspectives in Biology·Rubén Casanova-SáezKarin Ljung
Mar 1, 2021·Current Opinion in Plant Biology·Margaret Anne PelayoToshiro Ito
Feb 20, 2021·Proceedings of the National Academy of Sciences of the United States of America·Jing NieXiaolei Sui
Feb 4, 2021·The Plant Journal : for Cell and Molecular Biology·Masaaki UmedaHitoshi Sakakibara
Jul 3, 2021·Plants·Doudou Kong, Annette Becker
Sep 1, 2021·Proceedings of the National Academy of Sciences of the United States of America·Erlei ShangBo Sun

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