黄河中上游半干旱区典型盐渍土中拮抗性放线菌筛选

对采自陕西、宁夏和内蒙等地典型盐渍土中放线菌组成及拮抗性进行了研究。结果表明:(1)该地区盐渍土中放线菌以链霉菌属为主,非链霉菌仅占9.27%,链霉菌属中以球孢类群,粉红孢类群,灰褐类群,黄色类群为主,占到放线菌总数的55.62%。(2)供试的706株放线菌中有拮抗活性的占到76.44%,但广谱性拮抗菌株较少;对细菌拮抗能力较真菌强;拮抗性放线菌以粉红孢类群、灰褐类群和球孢类群为优势类群;(3)发酵滤液拮抗性试验筛选出4株能产生较强抑菌活性物质的菌株,其中3株都是粉红孢类群。

Screening of antagonistic actinomycetes from typical saline soils in semiarid area of the upper and middle reaches of Yellow River

In this paper the composition of actinomycetes sorts and their antagonism was investigated,which were separated from the saline soils of the upper and middle reaches of Yellow River.The results show that the main sort of actinomycetes in this area is Streptomyces,and the other genus only occupies by 9.27%.Globosporu,Roseosporus,Griseofuscus and Flavus are the major genus among Streptomyces.The strains of actinomycetes which have antagonistic activity occupy 76.44% of the 706 strains tested,but few are broad-spectrum strains;these strains have stronger antagonistic capability to bacteria than to fungi;the dominant genus of antagonistic actinomycetes are Roseosporus,Griseofuscus and Globosporu.Through the antagonistic test of ferment filtrate, 4 strains that can produce some substance with higher antagonistic activity have been screened;three of them belong to Roseosporus.