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JXB Advance Access published online on August 28, 2006
Journal of Experimental Botany, doi:10.1093/jxb/erl073
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received March 21, 2006
Accepted May 30, 2006

Major Themes in Flowering Research Special Issue

Additional targets of the Arabidopsis autonomous pathway members, FCA and FY

S. Marquardt 1, P. K. Boss 2, J. Hadfield 1, and C. Dean 1 *

1 Department of Cell and Developmental Biology, John Innes Centre, Colney Lane, Norwich NR4 7UH, UK
2 Department of Cell and Developmental Biology, John Innes Centre, Colney Lane, Norwich NR4 7UH, UK; Present address: CSIRO Plant Industry, PO Box 350, Glen Osmond, SA 5064, Australia

* To whom correspondence should be addressed.
C. Dean, E-mail: caroline.dean{at}bbsrc.ac.uk


  Abstract

A central player in the Arabidopsis floral transition is the floral repressor FLC, the MADS-box transcriptional regulator that inhibits the activity of genes required to switch the meristem from vegetative to floral development. One of the many pathways that regulate FLC expression is the autonomous promotion pathway composed of FCA, FY, FLD, FPA, FVE, LD, and FLK. Rather than a hierarchical set of activities the autonomous promotion pathway comprises sub-pathways of genes with different biochemical functions that all share FLC as a target. One sub-pathway involves FCA and FY, which interact to regulate RNA processing of FLC. Several of the identified components (FY, FVE, and FLD) are homologous to yeast and mammalian proteins with rather generic roles in gene regulation. So why do mutations in these genes specifically show a late-flowering phenotype in Arabidopsis? One reason, found during the analysis of fy alleles, is that the mutant alleles identified in flowering screens can be hypomorphic, they still have partial function. A broader role for the autonomous promotion pathway is supported by a microarray analysis which has identified genes mis-regulated in fca mutants, and whose expression is also altered in fy mutants.

Keywords: Arabidopsis; autonomous promotion pathway; FCA; FLC; flowering time; FY; microarray; polyadenylation; RNA processing; vernalization.
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