Based on the RING finger RHAs transcript factor, two novel RHA2b type genes, TaRHA2b and RsRHA2b were cloned by RT-PCR along with RACE amplification from wheat and radish, respectively. The characterization structure and expression pattern of TaRHA2b and RsRHA2b were analysized. To elucidate the function of RHA2b, three type plant expression vectors, p35S::RsRHA2b, p35S::GluCP1::RsRHA2b and p35S::GluCP2::RsRHA2b were constructed, and transgenic rice and wheat plants were abtained respectively. The results w...