Biological Characteristics of 60Co-induced Mutants of Ralstonia solanacearum for Plant Vaccines
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摘要: 利用60 Co辐射诱变青枯雷尔氏菌无致病力菌株FJAT-1458构建其突变体库,比较诱变后菌株与出发菌株在生长特性、防效、定殖方面的异质性。结果表明,60 Co诱变处理菌株的最佳剂量为200Gy,致死率达到92.5%。52株60 Co辐射诱变菌株中,有7株菌能提高对番茄青枯病的防治效果,为正突变,占13.5%;有11株菌的生防效果明显低于出发菌株的防治效果,负诱变率占21.6%,其中60 Co诱变后菌株FJAT-15022对番茄青枯病生防效果最好,在接种致病性青枯雷尔氏菌后第15d,对番茄青枯病防治效果达91.7%,明显高于出发菌株(83.3%)。60 Co诱变后菌株FJAT-15022的生长特性与出发菌株FJAT-1458不同,菌株FJAT-15022能在较高温度(40℃)正常生长,而出发菌株FJAT-1458在此温度下不能生长;二者的生长曲线不尽不同,主要表现在对数生长期,菌株FJAT-15022的生长速率大于出发菌株FJAT-1458,但差异未达显著水平。60 Co诱变后菌株FJAT-15022的定殖特性也与出发菌株FJAT-1458不同,菌株FJAT-15022的定殖时间比出发菌株FJAT-1458延迟5d,但出发菌株FJAT-1458的定殖数量高于诱变后菌株FJAT-15022。Abstract: Biological characteristics of the 60Co-induced mutants of Ralstonia solanacearum to be used as plant vaccines were studied.The avirulent strain of R.solanacearum,FJAT-1458,was treated by 60Co irradiation to create the mutant library.The bio-control efficiency on the bacterial wilt disease and the colonization on the host of the original and the mutated strains were compared.The results showed that the optimum 60Co dosage for the mutagenic treatment was 200Gy.After such treatment,92.5% of the irradiated bacteria were found dead.Among the 52 60Co-irradiated mutants,13.5% of them displayed an increased bio-control efficiency,while 21.6% showed a negative effect,as compared to the original strain.The 15-day,91.7% control efficiency on the bacterial wilt disease of the mutant,FJAT-15022,was the highest among all.It was significantly higher than the original strain,FJAT-1458,which had a control efficiency of 83.3%.Furthermore,the mutant,FJAT-15022,could grow at 40℃,while the original strain,FJAT-1458,could not.The colonization of the 60Co-mutanted strain,FJAT-15022,in the host was 5 days longer than that of the original strain,FJAT-1458.On the other hand,the number of FJAT-1458 in the host was more than that of the mutant,FJAT-15022.
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Key words:
- Ralstonia solanacearum /
- plant vaccine /
- 60Co mutagenic treatment /
- bio-control effect /
- colonization
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