Extended Vernalization Regulates Inflorescence Fate in Arabis alpina by Stably Silencing PERPETUAL FLOWERING1

Plant Physiology
Ana LazaroMaria C Albani

Abstract

The alpine perennial Arabis alpina initiates flower buds during prolonged exposure to cold. In the accession Pajares, we demonstrate that the length of vernalization influences flowering time and inflorescence fate but does not affect the axillary branches that maintain vegetative growth. The expression of floral organ identity genes gradually increases in the main shoot apex during vernalization, correlating with an increase in floral commitment. In northern Arabidopsis (Arabidopsis thaliana) accessions, the length of vernalization modulates the stable silencing of the floral repressor FLOWERING LOCUS C (FLC). We demonstrate that expression of PERPETUAL FLOWERING1 (PEP1), the ortholog of FLC in A. alpina, is similarly influenced by the duration of the exposure to cold. Extended vernalization results in stable silencing of PEP1 in the inflorescence. In contrast, insufficient vernalization leads to PEP1 reactivation after cold treatment, which correlates with delayed flowering and the appearance of floral reversion phenotypes such as bracts and vegetative inflorescence branches. Floral reversion phenotypes are reduced in the pep1-1 mutant, suggesting that PEP1 regulates the fate of the inflorescence after vernalization. The effe...Continue Reading

Citations

Nov 28, 2018·Journal of Experimental Botany·Ana LazaroMaria C Albani
Apr 3, 2019·Molecular Ecology·Kathleen Donohue
Jul 17, 2019·Cold Spring Harbor Perspectives in Biology·Yang Zhu, Doris Wagner
Nov 16, 2020·Plant, Cell & Environment·Sarah MatarSiegbert Melzer
Jan 21, 2021·Journal of Experimental Botany·Stanislav Kopriva, Andreas P M Weber
Dec 19, 2020·The Plant Journal : for Cell and Molecular Biology·Anna SergeevaPetra Bauer
Mar 9, 2021·Frontiers in Plant Science·Wim J J SoppeMaria C Albani
Apr 28, 2021·Plant Science : an International Journal of Experimental Plant Biology·Zigang LiuChao Mi
Sep 23, 2021·Proceedings of the National Academy of Sciences of the United States of America·Eva MadridGeorge Coupland
Sep 28, 2021·The Plant Journal : for Cell and Molecular Biology·Othman Al-DossaryRobert J Henry
Aug 21, 2021·Molecular Ecology Resources·Stefan WötzelFelix Gugerli

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