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Plant Signal Behav. 2008 Jul;3(7):450-2.

Co-regulation of ribosomal protein genes as an indicator of growth status: Comparative transcriptome analysis on axillary shoots and seeds in Arabidopsis.

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  • 1Growth Regulation Research Group; RIKEN Plant Science Center; Yokohama, Japan.

Abstract

Plant growth is regulated by internal and external cues using a limited number of genes coded in the genome. Comparative transcriptome analysis often provides an indication of which particular sets of genes are co-regulated in different physiological events. We have recently reported that protein synthesis-related genes were highly overrepresented in the genes upregulated during germination in Arabidopsis. In particular, these included approximately 100 ribosomal protein (RP) genes. The promoters of these genes had a higher frequency of two cis elements, designated as Up1 and Up2. Up1 is almost identical to the target cis element of TCP transcription factors. We also found that a similar set of RP genes is upregulated during decapitation-induced axillary shoot outgrowth. Thus, Up1-mediated activation of RP genes appears to be a common mechanism for growth induction in axillary shoots and imbibed seed. Moreover, co-regulation of a large number of RP genes suggests that these genes are useful markers to monitor growth states for microarray analyses.

KEYWORDS:

Arabidopsis; TCP transcription factors; axillary shoot; cis element; co-regulation; genome-wide gene expression analysis; growth activation; microarray analysis; ribosomal protein genes; seed

PMID:
19704481
PMCID:
PMC2634425
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