Streptomyces are mycelial multicellular soil actinomycetes in which adverse environmental conditions induce a developmental program involving complex morphological differentiation coordinated with synthesis of an enormous variety of interesting and useful secondary metabolites 链霉菌是丝状多细胞土壤放线菌，土壤逆环境诱导链霉菌具有复杂形态分化生命周期，获得合成大量有用次生代谢物能力。
