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首页> 外文期刊>Journal of environmental biology >Comparative studies on the effects of Bt-transgenic and non- transgenic cotton on arthropod diversity, seedcotton yield and bollworms control
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Comparative studies on the effects of Bt-transgenic and non- transgenic cotton on arthropod diversity, seedcotton yield and bollworms control

机译：转Bt基因棉和非转基因棉花对节肢动物多样性，棉籽产量和棉铃虫防治作用的比较研究

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The effectiveness of commercial Bt-cotton in pest management, influence on arthropod diversity, natural enemies, and toxin flow in the insect fauna under field conditions were studied keeping in view the need to assess bioefficacy and biosafety of Bt-transgenic cotton. There were no significant differences in oviposition by Helicoverpa armigera on Bt-transgenic and non-transgenic cottons (9.2 versus 9.6 eggs plants~(-100)), while the numbers of H. armigera larvae were significantly more on non-transgenic than on Bt-transgenic (10.4 versus 4.0 larvae plants~(-100)) cotton. The Bt-cotton had significantly more number of mature opened bolls (9.6 versus 4.4 bolls plant~(-1)), lower bollworm damage (12.8 versus 40.2% bolls damaged), and higher seedcotton yield (667.7 versus 231.7 kg ha~(-1) ). Population of cotton leafhopper, Amrasca biguttula biguttula was lower (582.2 versus 732.2 leafhoppers plants~(-100)), while that of whitefly, Bemisia tabaci was higher on Bt-transgenic (65.2 versus 45.6 whiteflies plants ~(-100)) than on non-transgenic cotton. There was no significant influence of Bt-transgenic cotton on abundance of natural enemies of crop pests - chrysopids (9.6 versus 8.4 chrysopids plants~(-100)), ladybird beetles (16.0 versus 10.8 ladybirds plants ~(-100)), and spiders (128.4 versus 142.8 spiders plants~(-100)). There were no significant differences in H. armigera egg (19.8 versus 20.9%), larval (7.4 versus 9.6%), and larval-pupal (1.3 versus 2.9%) parasitism on Bt-transgenic and non-transgenic cottons in the farmer's fields. The parasitism in larvae of H. armigera was far lower than that of the eggs, which might be because of early mortality of H. armigera prior to parasitoid development in the host larvae. Although, CrylAc Bt toxin was detected in Cheilomenes sexmaculatus, chrysopids, A. bigutulla bigutulla, Thrips tabaci, Myllocerus sp., Oxycarenus laetus, Dysdercus koenigii, spiders, bugs, and grasshoppers, no significant differences were observed in their abundance on Bt-transgenic and non-transgenic cottons, suggesting that there were no adverse effects of Bt-cotton on the arthropod diversity under field conditions.
机译：考虑到需要评估转Bt转基因棉的生物有效性和生物安全性，研究了商业化Bt棉在田间条件下在害虫管理，对节肢动物多样性，天敌以及毒素在动物群中的毒素流动的影响方面的有效性。棉铃虫在转Bt基因棉和非转基因棉上的产卵率无显着差异（9.2对9.6个卵植物〜（-100）），而棉铃虫幼虫在非转基因棉上的数量明显多于Bt。 -转基因棉花（10.4对4.0幼虫植物〜（-100））棉花。 Bt棉的成熟开放棉铃数量显着增加（9.6到4.4的棉铃植物〜（-1）），较低的棉铃虫危害（12.8到40.2％的棉铃受损）和较高的籽棉产量（667.7 vs 231.7 kg ha〜（- 1））。转Bt基因的棉叶蝉Amrasca biguttula biguttula种群数量较少（582.2对732.2叶蝉植物〜（-100）），而Bt转基因的粉虱，烟粉虱（Bemisia tabaci）种群数量较高（65.2对45.6粉虱植物〜（-100））。非转基因棉花。转Bt基因棉花对农作物害虫天敌的丰富度没有显着影响-鳞翅目（9.6对8.4鳞翅目植物〜（-100）），瓢虫（16.0对10.8对瓢虫植物〜（-100））和蜘蛛（128.4对142.8蜘蛛植物〜（-100））。 Bt转基因和非转基因棉花在棉田中的棉铃虫卵（19.8比20.9％），幼虫（7.4比9.6％）和幼虫pu（1.3比2.9％）无显着差异。棉铃虫幼虫中的寄生虫比卵中的寄生虫低得多，这可能是由于棉铃虫在寄主幼虫中出现了类寄生虫之前的早期死亡。虽然，在鹅绒螯虾，扁虱，大头曲霉，烟蓟马，Myllocerus sp。，Oxycarenus laetus，Dysdercus koenigii，蜘蛛，虫子和蚱s中均检测到了CrylAc Bt毒素，但在B-突变体上未发现显着差异和非转基因棉花，表明在田间条件下Bt棉对节肢动物多样性没有不利影响。

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