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Plant Cell Advance Online Publication
Published on April 20, 2004; 10.1105/tpc.021741

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Received February 11, 2004
Accepted February 12, 2004

Genome-Wide Analysis of Spatial Gene Expression in Arabidopsis Flowers

Frank Wellmer 1, José Luis Riechmann 1, Márcio Alves-Ferreira 1, and Elliot M. Meyerowitz 1*

1 California Institute of Technology, Division of Biology 156-29, Pasadena, California 91125

* To whom correspondence should be addressed. E-mail: meyerow{at}caltech.edu.

We have compared the gene expression profiles of inflorescences of the floral homeotic mutants apetala1, apetala2, apetala3, pistillata, and agamous with that of wild-type plants using a flower-specific cDNA microarray and a whole genome oligonucleotide array. By combining the data sets from the individual mutant/wild type comparisons, we were able to identify a large number of genes that are, within flowers, predicted to be specifically or at least predominantly expressed in one type of floral organ. We have analyzed the expression patterns of several of these genes by in situ hybridization and found that they match the predictions that were made based on the microarray experiments. Moreover, genes with known floral organ-specific expression patterns were correctly assigned by our analysis. The vast majority of the identified transcripts are found in stamens or carpels, whereas few genes are predicted to be expressed specifically or predominantly in sepals or petals. These findings indicate that spatially limited expression of a large number of genes is part of flower development and that its extent differs significantly between the reproductive organs and the organs of the perianth.




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