Objective  Structure and function of OsBI-1L-8 promoter were studied to decipher the mechanism of OsBI-1L genetic family involved in the life of Oryza sativa L.

  Method  Length of pOsBI-1L-8 was predicted using the online software BDGP, Softberry, and Promoter 2.0. The cis-acting regulatory elements of pOsBI-1L-8 isolated from the genomic DNA of Nipponbare were analyzed based on the PlantCARE database. The pOsBI-1L-8::GUS vector was then constructed and transformed into rice callus, and spatiotemporal expression characterization by histochemical staining.

  Result  The length of pOsBI-1L-8 was determined to be 1 258 bp by the predictive analysis and PCR amplification. The region consisted of several cis elements associated with light signal, response to anaerobic stress, and hormone regulation. The GUS reporter gene driven by pOsBI-1L-8 was expressed only during the heading period at the stem-stem junctions, root-stem junctions, and stamens.

  Conclusion  pOsBI-1L-8 was a tissue-specific promoter. OsBI-1L-8 gene was postulated to play an important role in the growth and stamen development of a rice plant.