MtVRN2 is a Polycomb VRN2-like gene which represses the transition to flowering in the model legume Medicago truncatula

Show simple item record Vista, Mauren en Zhang, Lulu en Che, C en Hurley, DG en Thomson, G en Wen, J en Mysore, KS en Putterill, Joanna en 2016-08-12T05:02:11Z en 2016-04 en
dc.identifier.citation The Plant Journal 86(2):145-160 Apr 2016 en
dc.identifier.issn 0960-7412 en
dc.identifier.uri en
dc.description.abstract Optimising the timing of flowering contributes to successful sexual reproduction and yield in agricultural plants. FLOWERING LOCUS T (FT) genes, first identified in Arabidopsis thaliana (Arabidopsis), promote flowering universally, but the upstream flowering regulatory pathways can differ markedly among plants. Flowering in the model legume, Medicago truncatula (Medicago) is accelerated by winter cold (vernalisation) followed by long day (LD) photoperiods leading to elevated expression of the floral activator, FT-like gene FTa1. However, Medicago, like some other plants, lacks the activator CONSTANS (CO) and the repressor FLOWERING LOCUS C (FLC) genes which directly regulate FT and are key to LD and vernalisation responses in Arabidopsis. Conversely, Medicago has a VERNALISATION2-LIKE VEFS-box gene (MtVRN2). In Arabidopsis AtVRN2 is a key member of a Polycomb complex involved in stable repression of Arabidopsis FLC after vernalisation. VRN2-like genes have been identified in other eudicot plants, but their function has never been reported. We show that Mtvrn2 mutants bypass the need for vernalisation for early flowering in LD conditions in Medicago. Investigation of the underlying mechanism by transcriptome analysis reveals that Mtvrn2 mutants precociously express FTa1 and other suites of genes including floral homeotic genes. Double-mutant analysis indicates that early flowering is dependent on functional FTa1. The broad significance of our study is that we have demonstrated a function for a VRN2-like VEFS gene beyond the Brassicaceae. In particular, MtVRN2 represses the transition to flowering in Medicago by regulating the onset of expression of the potent floral activator, FTa1. en
dc.format.medium Print en
dc.language eng en
dc.publisher Wiley: 12 months en
dc.relation.ispartofseries The Plant Journal en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri en
dc.title MtVRN2 is a Polycomb VRN2-like gene which represses the transition to flowering in the model legume Medicago truncatula en
dc.type Journal Article en
dc.identifier.doi 10.1111/tpj.13156 en
pubs.issue 2 en
pubs.begin-page 145 en
pubs.volume 86 en
dc.identifier.pmid 26947149 en
pubs.end-page 160 en
dc.rights.accessrights en
pubs.subtype Article en
pubs.elements-id 524364 en Science en Biological Sciences en
dc.identifier.eissn 1365-313X en
pubs.record-created-at-source-date 2016-08-12 en
pubs.dimensions-id 26947149 en

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