Auxin controls circadian flower opening and closure in the waterlily

BMC Plant Biology
Meiyu KeXu Chen

Abstract

Flowers open at sunrise and close at sunset, establishing a circadian floral movement rhythm to facilitate pollination as part of reproduction. By the coordination of endogenous factors and environmental stimuli, such as circadian clock, photoperiod, light and temperature, an appropriate floral movement rhythm has been established; however, the underlying mechanisms remain unclear. In our study, we use waterlily as a model which represents an early-diverging grade of flowering plants, and we aim to reveal the general mechanism of flower actions. We found that the intermediate segment of petal cells of waterlily are highly flexible, followed by a circadian cell expansion upon photoperiod stimuli. Auxin causes constitutively flower opening while auxin inhibitor suppresses opening event. Subsequent transcriptome profiles generated from waterlily's intermediate segment of petals at different day-time points showed that auxin is a crucial phytohormone required for floral movement rhythm via the coordination of YUCCA-controlled auxin synthesis, GH3-mediated auxin homeostasis, PIN and ABCB-dependent auxin efflux as well as TIR/AFB-AUX/IAA- and SAUR-triggered auxin signaling. Genes involved in cell wall organization were downstream of ...Continue Reading

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Citations

Sep 22, 2018·Journal of Experimental Botany·Niek Stortenbeker, Marian Bemer
Dec 20, 2019·Nature·Liangsheng ZhangHaibao Tang
May 30, 2019·Cold Spring Harbor Perspectives in Biology·Nicky Creux, Stacey Harmer
Mar 20, 2021·The Science of the Total Environment·Ana Lilia Alzate-MarinCarlos A Martinez
Jun 16, 2021·Cold Spring Harbor Perspectives in Biology·R Clay WrightJennifer L Nemhauser
Jan 16, 2022·The Science of the Total Environment·Raquel Pérez MalufCarlos A Martinez

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Methods Mentioned

BETA
Scanning Electronic Microscopy
RNA-seq
GTPases
ubiquitination
chemical treatment

Software Mentioned

agriGO
TransDecoder
R package DEseq2
RSEM
Trinity
BlastX
ImageJ

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