RESISTANCE TO TOXINS FROM BACILLUS-THURINGIENSIS SUBSP KURSTAKI CAUSES MINIMAL CROSS-RESISTANCE TO BACILLUS-THURINGIENSIS SUBSP AIZAWAI IN THE DIAMONDBACK MOTH (LEPIDOPTERA, PLUTELLIDAE)

被引:99
|
作者
TABASHNIK, BE [1 ]
FINSON, N [1 ]
JOHNSON, MW [1 ]
MOAR, WJ [1 ]
机构
[1] AUBURN UNIV,DEPT ENTOMOL,AUBURN,AL 36849
关键词
D O I
10.1128/AEM.59.5.1332-1335.1993
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Repeated exposure in the field followed by laboratory selection produced 1,800- to >6,800-fold resistance to formulations of Bacillus thuringiensis subsp. kurstaki in larvae of the diamondback moth, Plutella xylostella. Four toxins from B. thuringiensis subsp. kurstaki [CryIA(a), CryIA(b), CryIA(c), and CryIIA] caused significantly less mortality in resistant larvae than in susceptible larvae. Resistance to B. thuringiensis subsp. kurstaki formulations and toxins did not affect the response to CryIC toxin from B. thuringiensis subsp. aizawai. Larvae resistant to B. thuringiensis subsp. kurstaki showed threefold cross-resistance to formulations of B. thuringiensis subsp. aizawai containing CryIC and CryIA toxins. This minimal cross-resistance may be caused by resistance to CryIA toxins shared by B. thuringiensis subsp. kurstaki and B. thuringiensis subsp. aizawai
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页码:1332 / 1335
页数:4
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