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常压室温等离子体(ARTP)对脱落酸产生菌的诱变效应

2017-05-30毛玉华张金儿周义凤

安徽农业科学 2017年27期

毛玉华 张金儿 周义凤

摘要[目的] 研究ARTP对脱落酸产生菌的诱变效应及有效性,以期获得高产突变菌株。[方法] 应用ARTP在电源功率100 W、等离子体温度25 ℃、气流量10 SLM、照射距离2 mm的条件下,进行不同照射时间的诱变处理,统计致死率、正变率、变异幅度等。[结果] 在100 s的处理剂量下,ARTP对脱落酸产生菌的正变率在20%以上,诱变幅度在-30.53%~22.06%,高产突变株6-2的S-ABA产量比出发菌株提高22.06%,且经连续5次传代试验,产量无明显变化。[结论] ARTP对脱落酸产生菌的正变率高、诱变幅度大,所获高产突变株的稳定性好。

关键词 脱落酸;常温室压等离子体;诱变效应

中图分类号 S-03 文献标识码 A 文章编号 0517-6611(2017)27-0010-02

Abstract [Objective] The aim was to study mutagenic effects of atmospheric and room temperature plasma (ARTP) on abscisic acid (ABA) producing strains to obtain mutants with high ABA production.[Method] ARTP was employed to generatethe mutants under the conditions of 100 W power supply,the plasma temperature of 25 ℃,gas flow of 10 SLM,and irradiation distance of 2 mm.The spore of Botrytis cinerea was treated by different mutation time.The statistical analysis of the mutagenic effects was carried out in terms of lethality,positive mutation rate and amplitude of variation.[Result] The positive mutation rate was above 20% and amplitude of variation was-30.53%-22.06% under the condition of 100 s treatment time with ARTP.The highyield mutant 6-2 had an increase of 22.06% comparing with the original strain,and the yield did not change significantly after five consecutive passage tests.[Conclusion] The ARTP mutation method has a high positive mutation rate and better stability on ABA producing strains.The stability of highyield mutant is good.

Key words Abscisic acid;ARTP;Mutagenic effects

脫落酸(ABA)是一种重要的植物激素,参与植物胚胎发育、种子休眠、果实成熟和逆境胁迫等许多方面,对植物生长发育起着重要调节作用[1]。植物接受胁迫信号,影响基因的表达,引起植物体内ABA 水平上升,从而增加植物的抗逆性[2] 。通过施用外源ABA可提高作物抗寒、抗旱、抗盐能力,在果树移植、种子储存、花卉园艺等领域有广阔的应用前景,但其生产成本较高是限制其农业应用的一个重要因素。微生物发酵法生产是近年来兴起的新的脱落酸生产方法[3],而提高菌种的发酵产量是降低成本的关键因素之一。通过菌种诱变是提高发酵产量的方法之一,寻求好的诱变方法是关键。

常压室温等离子体(ARTP)诱变方法不仅具有获得突变菌株的效率高、突变菌株的遗传稳定性好等特点,而且操作简便、安全、诱变效果稳定且无污染。……

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