consumption of bt maize pollen containing cry1ie does not negatively affect propylea japonica (thunberg) (coleoptera: coccinellidae)
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2017
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Abstract
Propylea japonica (Thunberg) (Coleoptera: Coccinellidae) are prevalent predators and pollen feeders in East Asian maize fields. They are therefore indirectly (via prey) and directly (via pollen) exposed to Cry proteins within Bt-transgenic maize fields. The effects of Cry1Ie-producing transgenic maize pollen on the fitness of P. japonica was assessed using two dietary-exposure experiments in the laboratory. In the first experiment, survival, larval developmental time, adult fresh weight, and fecundity did not differ between ladybirds consuming Bt or non-Bt maize pollen. In the second experiment, none of the tested lethal and sublethal parameters of P. japonica were negatively affected when fed a rapeseed pollen-based diet containing Cry1Ie protein at 200 μg/g dry weight of diet. In contrast, the larval developmental time, adult fresh weight, and fecundity of P. japonica were significantly adversely affected when fed diet containing the positive control compound E-64. In both experiments, the bioactivity of the Cry1Ie protein in the food sources was confirmed by bioassays with a Cry1Ie-sensitive lepidopteran species. These results indicated that P. japonica are not affected by the consumption of Cry1Ie-expressing maize pollen and are not sensitive to the Cry1Ie protein, suggesting that the growing of Bt maize expressing Cry1Ie protein will pose a negligible risk to P. japonica.
| Reference Key |
li2017toxinsconsumption
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|---|---|
| Authors | ;Yonghui Li;Yanmin Liu;Xinming Yin;Jörg Romeis;Xinyuan Song;Xiuping Chen;Lili Geng;Yufa Peng;Yunhe Li |
| Journal | matec web of conferences |
| Year | 2017 |
| DOI |
10.3390/toxins9030108
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| URL | |
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