To reveal the functions of flagellin Fli Caaa from Acidovorax avenae subsp. avenae( Aaa) in induction of immune responses of rice and its domains,the fli Caaa gene cloned from the strain IPN1 of Aaa was expressed in Escherichia coli strain BL21,and the purified protein Fli Caaa and the truncated proteins Fli Caaa-N and Fli Caaa-C were assayed for induction of immune responses in rice. The results showed that three purified proteins could induce the immune response of the rice Oryza sativa L. cv.Nipponbare,i...