Universität zu Köln

Hughes, Patrick William, Soppe, Wim J. J. and Albani, Maria C. ORCID: 0000-0002-8215-020X (2019). Seed traits are pleiotropically regulated by the flowering time gene PERPETUAL FLOWERING 1 (PEP1) in the perennial Arabis alpina. Mol. Ecol., 28 (5). S. 1183 - 1202. HOBOKEN: WILEY. ISSN 1365-294X

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Abstract

The life cycles of plants are characterized by two major life history transitions-germination and the initiation of flowering-the timing of which are important determinants of fitness. Unlike annuals, which make the transition from the vegetative to reproductive phase only once, perennials iterate reproduction in successive years. The floral repressor PERPETUAL FLOWERING 1 (PEP1), an ortholog of FLOWERING LOCUS C, in the alpine perennial Arabis alpina ensures the continuation of vegetative growth after flowering and thereby restricts the duration of the flowering episode. We performed greenhouse and garden experiments to compare flowering phenology, fecundity and seed traits between A. alpina accessions that have a functional PEP1 allele and flower seasonally and pep1 mutants and accessions that carry lesions in PEP1 and flower perpetually. In the garden, perpetual genotypes flower asynchronously and show higher winter mortality than seasonal ones. PEP1 also pleiotropically regulates seed dormancy and longevity in a way that is functionally divergent from FLC. Seeds from perpetual genotypes have shallow dormancy and reduced longevity regardless of whether they after-ripened in plants grown in the greenhouse or in the experimental garden. These results suggest that perpetual genotypes have higher mortality during winter but compensate by showing higher seedling establishment. Differences in seed traits between seasonal and perpetual genotypes are also coupled with differences in hormone sensitivity and expression of genes involved in hormonal pathways. Our study highlights the existence of pleiotropic regulation of seed traits by hub developmental regulators such as PEP1, suggesting that seed and flowering traits in perennial plants might be optimized in a coordinated fashion.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hughes, Patrick William UNSPECIFIED UNSPECIFIED UNSPECIFIED Soppe, Wim J. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Albani, Maria C. UNSPECIFIED orcid.org/0000-0002-8215-020X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-154981
DOI:	10.1111/mec.15034
Journal or Publication Title:	Mol. Ecol.
Volume:	28
Number:	5
Page Range:	S. 1183 - 1202
Date:	2019
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1365-294X
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 NATURAL ALLELIC VARIATION; LOCUS-C; ARABIDOPSIS-THALIANA; ABSCISIC-ACID; MATING SYSTEM; GERMINATION; DORMANCY; FLC; VERNALIZATION; REPRODUCTION Multiple languages Biochemistry & Molecular Biology; Ecology; Evolutionary Biology Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15498