Gene Expression Profiling Provides Insight into the Escape Behavior of Deepwater Rice During Submergence
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Submergence harms plants by limiting gas exchange and decreasing incoming light. Upon prolonged flooding, deepwater rice (Oryza sativa) escapes complete submergence by rapid stem growth, but the mechanism of stem elongation in the early stages following submergence remains unclear. To elucidate changes in gene expression during early submergence-induced stem elongation, we performed transcriptome analysis using microarray system in deepwater rice. We compared gene expression between the control (0 h) and 1, 4 hour after submergence. We found 586 and 1,353 genes for Sub 1 h and 4 h treatments each that were up-regulated by at least two-fold, compared to the control (P < 0.05), submergence up-regulated gene expression related to at least 10 independent biological processes. Expression of deepwater rice genes related to energy production through fermentation increased with time after submergence, which likely ensures sufficient energy for rapid stem elongation. We provide the first report of initial and overall expression of deepwater rice genes related to the response specific to submergence escape.
KeywordsDeepwater rice Microarray Stem elongation Submergence escape Transcriptome
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