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蓝光和黑暗培养淡紫拟青霉形态及产孢量差异

2018-04-09李贵正张营郑树林刘永庆

湖北农业科学 2018年4期

李贵正 张营 郑树林 刘永庆

摘要:实验室完全黑暗和持续蓝光培养淡紫拟青霉(Paecilomyces lilacinus),观察营养生长及无性生殖形态差异。结果表明,蓝光对拟青霉营养生长影响较小,蓝光感光期为培养36~96 h,蓝光使产孢期提前20 h,使分生孢子产量增加145.9%;中试对实验室结论进行了初步验证,蓝光使分生孢子产量增加36.8%,蓝光和黑暗发酵产品分生孢子成活率无差异。

关键词:蓝光;淡紫拟青霉(Paecilomyces lilacinus);形态差异;分生孢子产量

中图分类号:S432.4+4 文献标识码:A 文章编号:0439-8114(2018)04-0036-03

DOI:10.14088/j.cnki.issn0439-8114.2018.04.009

The Form and Spore Yield Differentia of Paecilomyces lilacinus

under Blue Light and Darkness

LI Gui-zheng, ZHANG Ying, ZHENG Shu-lin, LIU Yong-qing

(Kingenta Ecological Engineering Group Co.,Ltd., Linyi 276700,Shandong,China)

Abstract: The form and spore yield differentia under total darkness and continuous blue light were observed in laboratory. The results showed that the continuous blue light had little affection on the growth period,while the blue photophase was between 36~96 h,and it was 20 h earlier to produce spore than darkness and the yield of spore increased 145.9% under blue light; Pilot tests were experimented to prove the conclusion,and the yield of spore increased 36.8% under blue light. The spore rate of survival under total darkness and continuous blue light was no difference.

Key words: blue light; Paecilomyces lilacinus; form differentia; spore yield

淡紫擬青霉(Paecilomyces lilacinus)是土壤中植物线虫的一种兼性寄生真菌,它主要通过分生孢子寄生于线虫卵使其不能孵化出幼虫而达到杀虫目的,因此其有效成分是活性分生孢子[1]。蓝光是一种很重要的环境信号,它能调节大多数微生物尤其是真菌的生长和代谢。研究发现蓝光主要影响真菌的新陈代谢、生长、有性和无性生殖过程、色素形成和向性运动等[2]。蓝光能显著提高真菌分生孢子产量,玫烟色拟青霉持续蓝光培养产生的分生孢子量较完全黑暗培养提高109倍[3]。淡紫拟青霉作为生物肥药已在世界范围内用于线虫防治,但行业普遍存在发酵产孢量不高的问题,用传统手段大幅度提高产孢量较困难,如何大幅度提高产孢量仍是一个迫切需要解决的难题。本试验尝试将蓝光应用于拟青霉发酵,既为拟青霉发酵引入光调控提供依据,又为采用科学合理工艺条件提高真菌分生孢子产量找到新的技术突破口。

1 材料与方法

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