Figure 1

Dendrogram of 2566 tissue-specifically expressed genes in the five tissues of O. longistaminata. 1. Rhizome tips, 2. Shoot tips, 3. Rhizome internodes, 4. Stem internodes, 5. Young leaves. The suffixes a, b, and c indicate the three biological repeats. In the color panels, each horizontal line represents a single gene and the color of the line shows the expression level of the gene relative to the median in a specific sample: high expression in red, low expression in green. The row data represented here is provided in Additional file 2. Results from the three replicates of the microarray experiments were consistent, indicating the consistency of the gene expression patterns in the five sampled tissues. Two subsets of genes are apparent. Rhizome tips (labeled 1) and shoot tips (labeled 2) show high expression of genes near the top of the panel and moderate or low expression of genes below, while leaves (labeled 5) show low or moderate expression of genes near the top of the panel and high expression of genes below. Rhizome internodes (labeled 3) and stem internodes (labeled 4) show moderate or low expression of both subsets. The difference between rhizomes and shoots appears small in comparison with the difference between tips and internodes of both organs.