Abstract: The authors studied transcript accumulation of peroxidase gene in suspension-cultured cells of the near-isogenic rice lines under treatment by Zhongshengmycin , Xanthomonas oryzae , and Zhong-hengmycin + X. oryzae respectively by using DNA hybridization. Results showed that the transcript ac-cumulation could be induced by these different treatments at different degrees. The induction in CBB₄ , a resistant rice line to X. oryzae , occurred at the 3 h , peaked at 6 h , and lasted forf48h 24 h , after inoc-ulation with X. oryza , while the induction occurred at the 3 h , peaked at 6 h , and lasted for 72 h aftertreatment with Zhongshengmycin. To Shennong 1033 , a susceptible rice line to X. oryzae , the induction was observed at 48 h after inoculation with X. oryzae , but at 3 h when treated with Zhongshengmycin and lasted for 48 h. However , it was concluded that the mode of the transcript accumulation of peroxidase gene induced in rice suspension cultured cells treated with Zhongshengmycin + X. oryzae was not so different from that in Zhongshengmycin treatment .