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The CYCLIN-DEPENDENT KINASE Module of the Mediator Complex Promotes Flowering and Reproductive Development in Pea.

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New pea genes, LATE BLOOMER3 (LATE3) and LATE4, regulate flowering time. These genes, orthologs of CDK8 and CYCC1, are crucial for plant reproductive development and conserved across eukaryotes.

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Area of Science:

  • Plant Biology
  • Genetics
  • Molecular Biology

Background:

  • Flowering time control is crucial for plant adaptation and agricultural productivity.
  • The pea (Pisum sativum) is a model legume for studying plant development.

Purpose of the Study:

  • To identify novel genetic components regulating flowering time in pea.
  • To characterize the function of two newly identified loci, LATE BLOOMER3 (LATE3) and LATE4.

Main Methods:

  • Forward genetics to isolate late-flowering mutants in pea.
  • Map-based cloning to identify the genes underlying the identified mutations.
  • Analysis of gene interactions and transcriptional regulation of flowering-related genes.

Main Results:

  • Two complementation groups, LATE3 and LATE4, were identified, affecting vegetative and reproductive development.
  • LATE3 and LATE4 were identified as orthologs of CYCLIN DEPENDENT KINASE8 (CDK8) and CYCLIN C1 (CYCC1), respectively.
  • LATE3 and LATE4 interact genetically and physically, regulating key flowering genes like FTa1 and LF.

Conclusions:

  • The CDK8 kinase module, including CDK8 and CYCC1 orthologs, plays a conserved role in regulating flowering time in plants.
  • LATE3 and LATE4 are essential for promoting flowering and maintaining normal reproductive development in pea.