Functional classification of the differentially expressed genes O. longistaminata with putative functions in the rhizome tips as compared with the shoot tips. Up-regulated genes are shown in white bars, down-regulated genes in gray bars. Putative functions, taken from the Affymetrix annotation combined with the TIGR definition and NCBI database, are listed below the bars. Expression of genes involved in transport, transcription regulation, photosynthesis, and miscellaneous functions (labeled "others") is lower in rhizome tips than in shoot tips. Expression of genes involved in signal transduction, redox regulation, metabolism, and membrane components is higher in rhizome tips than in shoot tips.