Journal
RICE SCIENCE
Volume 16, Issue 3, Pages 187-193Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1672-6308(08)60078-5
Keywords
rice; high temperature; starch branching enzyme; isoform; gene expression; real-time fluorescence quantitative PCR; rice quality
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An early-maturity indica rice variety Zhefu 49, whose grain quality and starch structure are sensitive to environmental temperature, was subjected to different temperatures (32 degrees C for high temperature and 22 degrees C for optimum temperature) at the grain filling stage in plant growth chambers, and the different expressions of three isoform genes (SBEI, SBEIII and SBEIV) encoding starch branching enzyme (SBE) in the endosperms were studied by the real-time fluorescence quantitative PCR (FQ-PCR) method. Effects of high temperature on the SBE expression in developing rice endosperms were isoform-dependent. High temperature significantly down-regulated the expressions of SBEI and SBEIII, while up-regulated the expression of SBEIV. Compared with SBEIV and SBEIII, the expression of SBEI gene in Zhefu 49 rice endosperms was more sensitive to temperature variation at the grain filling stage. This study indicates that changes in weather/ climate conditions especially temperature stress influence rice grain formation and its quality as evidenced by isoform expression.
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