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Plant and Cell Physiology Advance Access originally published online on May 20, 2005
Plant and Cell Physiology 2005 46(8):1190-1201; doi:10.1093/pcp/pci128
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JSPP © 2005

Microarray Analysis Reveals Vegetative Molecular Phenotypes of Arabidopsis Flowering-time Mutants

Iain W. Wilson1, Gavin C. Kennedy2, James W. Peacock1 and Elizabeth S. Dennis1,*

1 CSIRO Plant Industry, GPO Box 1600, Canberra ACT 2601, Australia
2 CSIRO Mathematical and Information Sciences, GPO Box 664, Canberra ACT 2601, Australia

* Corresponding author: E-mail, Liz.Dennis{at}csiro.au; Fax, +61-2-62465000.

The transition to flowering occurs at the shoot apex; however, most of the characterized genes that affect the timing of floral induction are expressed throughout the plant. To further our understanding of these genes and the flowering process, the vegetative molecular phenotypes of 16 Arabidopsis mutants associated with the major flowering initiation pathways were assayed using a 13,000 clone microarray under two different conditions that affect flowering. All mutants showed at least one change in gene expression other than the mutant flowering gene. Metabolism- and defence-related pathways were the areas with the most frequent gene expression changes detected in the mutants. Several genes such as EARLI1 were differentially expressed in a number of flowering mutants from different flowering pathways. Analysis of the promoter regions of genes differentially expressed identified common promoter elements, indicating some form of common regulation.

(Received March 15, 2005; Accepted May 12, 2005)
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