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药用真菌猪苓He-Ne激光及紫外线诱变育种的研究
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摘要
本文以药用真菌猪苓为研究对象,采用He-Ne激光及紫外线两种诱变处理对猪苓出发菌株菌丝体进行了单一诱变剂诱变和复合诱变。通过测量诱变菌落直径初步确定菌丝生长速率,从各单一诱变剂诱变和复合诱变中均获得的生长速率不同程度提高的变异菌株。
     对于初步筛选的变异菌株L3-7、U1-7、LU-7,测量了液体培养条件下的菌丝干重生长曲线、胞外粗多糖的动态积累、三种与碳素营养相关的酶的活性变化情况,从而进一步筛选出了生长量和胞外粗多糖产量均比出发菌株有显著提高的优势变异菌株LU-7。该菌株经酯酶同工酶谱分析,酶带条数和Rf值均发生了显著变化,同时通过传代稳定性试验分析,都表明该菌株遗传物质发生了改变且遗传稳定性好。
     对菌株LU-7的液体培养基进行了优化,包括碳源、氮源以及无机元素,还发现附加一定量的青冈木煮液,能明显提高菌丝生长速度和胞外多糖积累。同时优化了部分优势变异菌株的培养条件。菌株LU-7在经筛选的优化培养基上生长的最大菌丝体干重为165.5mg/30ml,比在基本培养基上生长的出发菌株高出了74.9%。LU-7在第11天达到产糖高峰期,为5.42mg/ml,比出发菌株的2.78mg/ml提高了95.0%。
     LU-7菌丝发酵滤液经Sevag法除蛋白,减压浓缩,95%乙醇沉淀,丙酮、乙醚洗涤等步骤获得了粗品胞外多糖,再经葡聚糖凝胶柱层析获得纯品多糖。采用薄层层析和纸层析分析了该菌株与出发菌株纯品多糖酸水解的单糖组成,发现其单糖组分都是以甘露糖为主。同时还对比了两者的红外光图谱,两者具有相同的特征吸收峰。说明优势变异菌株的胞外多糖并未发生变异。
In this paper, the starting strain of medicinal fungus-Polyporus umbellatus were mutagenized by He-Ne laser, UV and the multiple-irradiation of both the two mutagens. The colonial diameters of mutants were measured to define the mycelial growth rates and to screen out the strain- L3-7, U1-7, LU-7- with higher growth rates.
    Then the mycelial dry weight, the yields of crude extracellular polysaccharide and activities of three extracellular enzymes of the pre-selected mutants were tested to select the mutant strain LU-7 with the good characteristics in the three aspects. The analysis of the isoenzyme zymogram of esterase indicated that the mutants' esterase isoenzyme patterns and Rf value were different from the starting strain. The stabilitis on the growth rates and extracellular polysaccharide of different generations of the mutant strain were investigated. All these showed that the mutant's genetic substances had changed and had the good genetic stability.
    The liquid medium components and part of the culture conditions for this mutant were optimized, including carbon source, nitrogen source, inorganic elements, ventilatory condition, culture temperature and the addition of the natural material extract. It was found that the addition of the extract of C.glauca sawdust did good effect on the mycelial growth and extracellular polysaccharide yields. The greatest mycelial dry weight of LU-7 in the optimized medium was 165.5mg/30ml which was 74.9% higher than the starting strain in the basic medium. Its yields of crude extracellular polysaccharide was 5.42mg/ml which is 95.0% higher than the starting strain in the basic medium.
    The extracellular crude polysaccharide of the mutant was prepared by ethanol precipitation from fermentation product of the mutant. The protein in it was removed by the Sevag procedure. It was further purified by SephadexG-50 and SephadexG-150 column chromatography respectively. It was homogenous as determined by UV-spectrum, gel filtration and polyacrylamide gel electrophoresis. The components of the polysaccharide of the mutant and the starting strain were identified by TLC and PC. Results showed that the two kinds of polysaccharide were composed of mannose. The infrared spectrometry analysis showed that the polysaccharide of the mutant and the starting strain had the same characteristic absorption peaks and that proved the polysaccharide of the mutants was similar to the starting strain.
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