| 摘 要： | In this paper we use a new inducing method by applying the powerful and penetra-tire fast neutron and Co~(60)-γ rays on single colonies of just developed aerial hyphae from whichwe have obtained a high percentage of mutant strains. At the same time, the stimulativezone is used as the hormone screening index so that the breeding rate has been greatly acceler-ated. It has been proved in our research that this new method has many merits. It is easy toapply and to obtain a high ratio of mutants. Hence it is really a fast and effective in-ducing technique. The successful breeding of Streptomyces jingyangensis sp. nov., a highlyeffective stra.in "5406", provides us with its studies and utilization.
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