[Objective] Toyocamycin is an important nucleoside antibiotics with diverse bioactivities and potentials for biological control of plant diseases.We expressed the vgb gene encoding Vitreoscilla hemoglobin to alleviate the dissolved oxygen(DO) limitation and to improve the toyocamycin production in Streptomyces diastatochromogenes 1628.[Methods] we used gfp gene as the report gene to test the transcription activity of erythromycin resistance gene promoter PermE* of integrative plasmid pIB139.Then,the promote...