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四株对小地老虎有活性的苏云金芽胞杆菌的毒力评价

刘晓垒1,2, 王品舒2, 束长龙2, 王秀丽1, 郝再彬1, 张永军2, 宋福平2   

  1. 1. 桂林理工大学化学与生物工程学院,桂林 541004;2. 中国农业科学院植物保护研究所植物病虫害生物学国家重点实验室,北京 100193
  • 收稿日期:2011-03-03 修回日期:1900-01-01 出版日期:2012-05-08 发布日期:2012-05-08
  • 通讯作者: 宋福平

Toxicity Evaluation of Four Bacillus thuringiensis Strains against Agrotis ypsilon

LIU Xiaolei1,2, WANG Pinshu2, SHU Changlong2, WANG Xiuli1, HAO Zaibin1, ZHANG Yongjun2, SONG Fuping2   

  1. 1. College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004;2. State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
  • Received:2011-03-03 Revised:1900-01-01 Online:2012-05-08 Published:2012-05-08

摘要: 本文对4株苏云金芽胞杆菌Bacillus thuringiensis(Bt)的杀虫基因类型、杀虫蛋白表达类型、蛋白表达量以及杀虫活性进行了初步的评价分析。菌株PS9-D12和PS9-C12的基因类型与蛋白表达类型丰富,且其杀虫蛋白表达量是对照菌株HD-1的1.7倍。在相同培养条件下,制备菌株胞晶混合冻干粉对小地老虎Agrotis ypsilon的生测结果显示,菌株HD-1、PS9-D12、PS9-C12、PS9-D11和PS9-H9的LC50分别为0.71、0.19、0.14、0.24和1.16 mg·g-1,菌株PS9-D12和PS9-C12的杀虫活性显著高于菌株HD-1(P<0.05);此4株菌株对小菜蛾Plutella xylostella幼虫的校正死亡率均大于78%,它们对甜菜夜蛾Spodoptera exigua幼虫的活性均高于菌株HD-1;而对大猿叶甲Colaphellus bowringi幼虫均无活性。可见菌株PS9-D12和PS9-C12比商业化生产的HD-1有更好的杀虫活性,可作为Bt杀虫剂的候选材料。

Abstract: The types of insecticidal genes and expressed proteins, expressed protein contents and insecticidal activity of four Bacillus thuringiensis strains were evaluated in this study. Results indicated that more types of insecticidal gene and protein were found in the strains PS9-D12 and PS9-C12 and the amount of expressed protein in PS9-D12 and PS9-C12 was 1.7 fold that in HD-1. Bioassay results with crystal-spore powder of the strains prepared against Agrotis ypsilon in the same cultured condition showed that the LC50 value of strains HD-1, PS9-D12, PS9-C12, PS9-D11and PS9-H9 were 0.71, 0.19, 0.14, 0.24 and 1.16 mg·g-1, respectively. The virulence of the strains PS9-D12 and PS9-C12 was significantly higher than that of the strain HD-1 (P<0.05). The toxicity of 4 strains in this study to larvae of Plutella xylostella with mortality of more than 78%, and more virulent to larvae of Spodoptera exigua than that of HD-1, but no insecticidal activity to larvae of Colaphellus bowringi. All results suggest that PS9-D12 and PS9-C12 with higher insecticidal activity than commercial strain HD-1 can be good candidates to develop new B. thuringiensis pesticides.

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