Figure 2.

Transcriptome profiling during sheath maturation in maize. (A) K-means clustering showing the expression profile of the maize sheath transcriptome. Eight major clusters (K1–K8) were identified along the four developmental stages (stage 1 to 4) in sheath tissues from 7918 differentially expressed genes. (B) Functional category enrichment was calculated using the MapMan binning method among the eight major clusters in A. The shade of red represents the significance level of log 10 transformed p-values calculated from Fisher’s exact test. Gray blocks indicate functional category enrichment was absent.