کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4506872 1321333 2011 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Feeding disruption tests for monitoring the frequency of larval lepidopteran resistance to Cry1Ac, Cry1F and Cry1Ab
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم زراعت و اصلاح نباتات
پیش نمایش صفحه اول مقاله
Feeding disruption tests for monitoring the frequency of larval lepidopteran resistance to Cry1Ac, Cry1F and Cry1Ab
چکیده انگلیسی

An alternative to traditional larval lepidopteran resistance-monitoring bioassays was developed. Feeding disruption tests were developed for detecting insects resistant to three Bacillus thuringiensis (Bt) proteins: Cry1Ac, Cry1F and Cry1Ab. The assays rely on a diagnostic dose of Bt toxin in 100-μl hydratable meal pads of artificial diet containing blue indicator dye. The assay was formatted as a portable (palm-sized) plastic plate containing an array of 16 test wells, each containing a single hydratable meal pad with one insect added per well. The diagnostic dose was the concentration of Bt in meal pad rehydration solution that reduced 24 h dyed fecal production of Bt-susceptible neonates to ≤2 fecal pellets per larva. Bt-resistant neonates were able to consume the diagnostic dose of the insecticidal protein and produce >2 blue fecal pellets. The feces were distinctly visible on the white background of the feeding disruption test plate. Diagnostic doses were determined with lab-strain Bt-susceptible Heliothis virescens and Helicoverpa zea. For H. virescens, the diagnostic doses were 10, 20 and 15 μg/ml for Cry1Ac, Cry1F and Cry1Ab, respectively. For H. zea, the diagnostic doses were 40, 200 and 500 μg/ml, respectively. The assays were validated against a lab-strain of Bt-resistant H. virescens and with susceptible larval H. virescens collected as eggs from field-grown tobacco in North Carolina.


► New device described for monitoring insect resistance, a portable (palm-sized) plastic, 16-well plate containing a hydratable insect meal with a blue indicator dye and a diagnostic dose of insecticide in each well.
► Assay principle is based on feeding disruption on an insecticide-treated artificial insect diet. The assay endpoint is the presence or absence of blue feces on the white background of the assay device.
► Proof of concept in the laboratory and field was demonstrated for the tobacco budworm and cotton bollworm for the Bt toxins Cry1Ac, Cry1F and Cry1Ab.
► Assay architecture should be applicable for resistance monitoring for other insects.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Crop Protection - Volume 30, Issue 7, July 2011, Pages 863–870
نویسندگان
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