Expression Character of Rice SUPERNUMERARY BRACT( OsSNB) in Response to Abiotic Stress and Hormone

The AP2 transcription factor subfamily widely exists in plants,and plays a very important role in regulating plant development. The previous studies showed that SUPERNUMERARY BRACT( Os SNB) was a member of AP2 transcription factor subfamily containing 2 conservative AP2 domains. And Os SNB was involved in regulating the transition from spikelet meristem to floral meristem and the development of floral organ. However,it is not clear whether Os SNB is involved in abiotic stress responses. In this study,Os SNB gene was obtained from the RAP-DB rice database. In order to investigate the role of Os SNB in abiotic stress and hormone response,sequence analysis revealed that Os SNB promoter contained multiple hormone and stress responsive cis-acting elements,including GCC-box,ABRE,DRE and WRKY. Gene express analysis showed that Os SNB gene could be duressed by abiotic stress salt,drought and induced by hormones ABA and ethylene precursor ACC. These results suggested that Os SNB gene might be involved in regulating the expression of genes responsive to stresses,implying that Os SNB might have important functions in plant growth,development,and abiotic stress responses.