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核农学报  2012 

绿色产色链霉菌E-219菌落的形态分化

, PP. 466-470

Keywords: 绿色产色链霉菌,形态发育分化,斜面培养,荧光染色,种龄

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Abstract:

菌株E-219由原始菌株CGMCC4.1119经60Coγ诱变及原生质体融合等手段改造后所得,本文通过分子荧光探针、荧光显微镜和电镜对绿色产色链霉菌E-219在固体基质表面的发育分化周期、斜面培养时间对阿维拉霉素产量的影响进行了研究,以为工业发酵选择适当的斜面种子提供理论依据。试验表明该菌株菌落发育过程伴有间断性菌丝凋亡,分生孢子的产生是活性菌丝分化的结果。与原始菌株相比该菌落形态呈现显著不同,其孢子萌发形成杂色初生菌丝,基内菌丝出现二次死亡(48h)及其中活性菌丝片段的二次快速生长,分生孢子形成数量多。原始菌株呈螺旋状孢子丝,孢子表面带刺,而E-219为直线型孢子丝,分生孢子表面光滑无刺突。摇瓶试验表明,菌种斜面种龄以106h左右为宜,此时分生孢子活性高,阿维拉霉素发酵单位可达1200mg/L。

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