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The CYCLIN-DEPENDENT KINASE module of the mediator complex promotes flowering and reproductive development in pea


Hasan, AM and Vander Schoor, JK and Hecht, V and Weller, JL, The CYCLIN-DEPENDENT KINASE module of the mediator complex promotes flowering and reproductive development in pea, Plant Physiology, 182, (3) pp. 1375-1386. ISSN 0032-0889 (2020) [Refereed Article]

Copyright Statement

Copyright 2020 American Society of Plant Biologist

DOI: doi:10.1104/PP.19.01173


Control of flowering time has been a major focus of comparative genetic analyses in plant development. This study reports on a forward genetic approach to define previously uncharacterized components of flowering control pathways in the long-day legume, pea (Pisum sativum). We isolated two complementation groups of late-flowering mutants in pea that define two uncharacterized loci, LATE BLOOMER3 (LATE3) and LATE4, and describe their diverse effects on vegetative and reproductive development. A map-based comparative approach was employed to identify the underlying genes for both loci, revealing that that LATE3 and LATE4 are orthologs of CYCLIN DEPENDENT KINASE8 (CDK8) and CYCLIN C1 (CYCC1), components of the CDK8 kinase module of the Mediator complex, which is a deeply conserved regulator of transcription in eukaryotes. We confirm the genetic and physical interaction of LATE3 and LATE4 and show that they contribute to the transcriptional regulation of key flowering genes, including the induction of the florigen gene FTa1 and repression of the floral repressor LF. Our results establish the conserved importance of the CDK8 module in plants and provide evidence for the function of CYCLIN C1 orthologs in the promotion of flowering and the maintenance of normal reproductive development.

Item Details

Item Type:Refereed Article
Keywords:pea, flowering, mediator, genetic, florigen, photoperiod
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Grains and seeds
Objective Field:Grain legumes
UTAS Author:Hasan, AM (Mr A.S.M Hasan)
UTAS Author:Vander Schoor, JK (Mrs Jacqueline Vander Schoor)
UTAS Author:Hecht, V (Dr Valerie Hecht)
UTAS Author:Weller, JL (Associate Professor Jim Weller)
ID Code:145581
Year Published:2020
Funding Support:Australian Research Council (FT120100048)
Web of Science® Times Cited:9
Deposited By:Plant Science
Deposited On:2021-07-27
Last Modified:2021-09-02

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