Figure 2.

Clustering of expression data from flower-bud late genes. Genes are clustered according to their expression in flower buds of ten different cultivars (in columns) at a single collection time after 400 chilling hours. Asterisks label the putative orthologs of sporopollenin-biosynthesis and anther transcriptional factors of Arabidopsis. Clusters enriched in asterisk-labelled genes are coloured in yellow (I) and green (II). Microarray hybridization signals are represented by cells with a colour gradient from red (higher expression) to blue (lower expression).