Identification and expression analysis of the OsDIS1 gene in rice. A, Protein sequence alignment between OsDIS1, SINAT5 (Arabidopsis), SINA (Drosophila), and SIAH (human). B, Real-time PCR analysis of the OsDIS1 expression level under drought treatment. Ubq was used as an internal control, and OsDREB2A was used as a positive control for drought stress.