Universität zu Köln

Lazaro, Ana, Obeng-Hinneh, Evelyn and Albani, Maria C. ORCID: 0000-0002-8215-020X (2018). Extended Vernalization Regulates Inflorescence Fate in Arabis alpina by Stably Silencing PERPETUAL FLOWERING1. Plant Physiol., 176 (4). S. 2819 - 2834. ROCKVILLE: AMER SOC PLANT BIOLOGISTS. ISSN 1532-2548

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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 effect of vernalization duration on stable silencing of PEP1 is specific to meristems that initiate flowering during cold treatment. Extended vernalization fails to silence PEP1 in young seedlings and axillary branches that arise from buds initiated during cold treatment, which remain vegetative. We conclude that the duration of vernalization in A. alpina differentially regulates PEP1 in the inflorescence and axillary branches. PEP1 has a dual role regulating meristem fate; it prevents meristems from flowering and antagonizes inflorescence development after vernalization.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Lazaro, Ana UNSPECIFIED UNSPECIFIED UNSPECIFIED Obeng-Hinneh, Evelyn UNSPECIFIED UNSPECIFIED UNSPECIFIED Albani, Maria C. UNSPECIFIED orcid.org/0000-0002-8215-020X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-191532
DOI:	10.1104/pp.17.01754
Journal or Publication Title:	Plant Physiol.
Volume:	176
Number:	4
Page Range:	S. 2819 - 2834
Date:	2018
Publisher:	AMER SOC PLANT BIOLOGISTS
Place of Publication:	ROCKVILLE
ISSN:	1532-2548
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Biology > Botanical Institute
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FLOWERING-LOCUS-C; POLYCOMB-GROUP PROTEINS; AGE-DEPENDENT RESPONSE; MADS DOMAIN PROTEIN; ARABIDOPSIS-THALIANA; NATURAL VARIATION; DEVELOPMENT PATHWAYS; LIFE-CYCLE; FLC; GENE Multiple languages Plant Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/19153