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核农学报  2014 

链霉菌Snea253菌株的变异分析及对根结线虫活性影响

DOI: 10.11869/j.issn.100-8551.2014.09.1541, PP. 1541-1548

Keywords: 链霉菌Snea253,自发突变,菌落形态,杀线虫活性,基因分析

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Abstract:

为明确委内瑞拉链霉菌(Streptomycesvenezuelae)自发突变对南方根结线虫活性的影响。本研究利用继代培养法选育Snea253突变株,对形态分化及相关基因进行分析,并测其代谢产物的生物活性。获得6株菌落形态差异大的自发突变菌株,其中不产色素的3株突变菌株Snea253-G、Snea253-B和Snea253-F杀线虫活性分别为61.0%、45.5%和35.0%;产色素的3株突变株Snea253-A、Snea253-H和Snea253-J杀线虫活性分别为48.7%、37.2%和37.9%。ssgA、bldC、bldD、whiB、whiE和whiI基因克隆测序结果显示各突变株基因序列没有差异,可能此6个基因没有直接参与控制Snea253菌株的自发突变。链霉菌自发突变不但使其形态发生变异,而且也影响了其代谢产物的生物活性,研究为从形态上筛选优良菌株提供了相关理论依据。

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