Baseline susceptibility of Cnaphalocrocis medinalis (Lepidoptera : Pyralidae) to Bacillus thuringiensis toxins in China
文献类型: 外文期刊
第一作者: Hou, M. L.
作者: Hou, M. L.;Peng, Y. F.;Liu, P. L.
作者机构:
关键词: Cnaphalocrocis medinalis;Bacillus thuringiensis;baseline susceptibility;bioassay;CHILO-SUPPRESSALIS LEPIDOPTERA;SCIRPOPHAGA-INCERTULAS LEPIDOPTERA;RICE EXPRESSING CRY1AC;TRANSGENIC RICE;DIAMONDBACK MOTH;NONTRANSGENIC RICE;STEM BORERS;RESISTANCE;CRAMBIDAE;GENE
期刊名称:JOURNAL OF ECONOMIC ENTOMOLOGY ( 影响因子:2.381; 五年影响因子:2.568 )
ISSN:
年卷期:
页码:
收录情况: SCI
摘要: Geographic variability in susceptibility of field-collected Cnaphalocrocis medinalis (Guenee) (Lepidoptera: Pyralidae) to Bacillus thuriugiensis (Berliner) was studied to establish a geographic baseline for comparison of future population responses to the increased use of B. thuringiensis-based insect control products. Colonies of C. medinalis were established from 10 populations collected from 10 different provinces in the major rice (Oryza savita L.)-growing regions of China. Populations were evaluated for their susceptibility to Cry1Ac and Cry1Ab endotoxin proteins with the leaf-dip bioassay. The LC50 values to Cry1Ac and Cry1Ab were estimated for the 10 populations. Bioassay results indicated that the ranges of LC50 in the second instars of C. medinalis to Cry1Ac and Cry1Ab were from 3.77 to 208.22 mg ([AI])/liter and 0.22-7.05 mg ([AI])/liter, respectively. The relative ratios in susceptibility between the most susceptible and the most tolerant populations were beyond 50-fold for Cry1Ac and 30-fold for Cry1Ab. Moreover, there was a significant positive correlation between susceptibilities to the two toxins tested, suggesting that insect populations that are relatively tolerant to one protein are also relatively tolerant to the other.
分类号: Q969.9
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