|De Los Reyes, B|
Submitted to: Meeting Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 9/1/2006
Publication Date: 10/9/2006
Citation: De Los Reyes, B.G., Cheng, C., Yun, K.Y., Jia, Y., Ressom, H., Gibbons, J., Yun, .S. 2006. Candidate regulators of the cold stress response gene regulon of rice. Meeting Proceedings. Interpretive Summary:
Technical Abstract: Transcriptional regulation is an important aspect of the complex network of genes involved in plant responses to low temperature. At the seedling stage, most japonica cultivars can survive continuous exposure to as low as 10oC for up to 7 days better than most indica cultivars. Here we present a snap-shot of the chilling stress gene regulon of japonica rice based on integrative analysis of the transcriptome during the initial 24 hr at 10oC and associated regulatory features of candidate genes. The current data establish the foundation towards the assembly of more comprehensive transcriptional regulatory network of rice using the japonica genome sequence and global expression profiles. Four ‘early response’ Transcription factors were identified in a semi-global survey of the transcriptome of japonica rice. These genes exhibit distinct expression signatures between tolerant and intolerant genotypes, suggesting that they probably play some roles in regulating the gene network that defines the differences in chilling-sensitivity between indica and japonica rice. The other genes (Group-II) whose induction profiles overlap with the timing of induction of the four TFs can be grouped according to the structure of their promoters. The as1/ocs-like element (cognate of bZIP-type TF) appears to be a major enhancer of ‘early response’ gene expression. This finding suggests that reactive oxygen species (ROS) is probably a major signal in the activation of ‘early response’ genes.