摘要
【背景】瓢虫科天敌昆虫是玉米田中重要的天敌类群,可捕食多种农业害虫,对害虫有很好的控制作用。为了明确转基因玉米对瓢虫科天敌的潜在效应。【方法】在田间条件下,采用系统调查结合吸虫器方法,研究了cry1Ab基因玉米对玉米田主要瓢虫科天敌种类丰富度和种群动态的影响。【结果】转cry1Ab基因玉米田与其对照田瓢虫类群和优势种群组成相同。春播时Bt玉米田与对照田以龟纹瓢虫为优势种,仅在玉米生长后期Bt玉米田中的龟纹瓢虫数量显著高于对照田,其他时期2种田间龟纹瓢虫的种群动态没有显著差异。夏播玉米田以龟纹瓢虫和异色瓢虫为主,在8月17日Bt玉米田中异色瓢虫数量显著高于对照田,在9月27日其异色瓢虫数量显著低于对照田,而其他时期Bt玉米田和对照田中异色瓢虫优势度以及田间种群动态没有显著差异。【结论与意义】转cry1Ab基因玉米对玉米田重要的瓢虫科天敌丰富度、优势度和种群数量没有不良影响。因此,该转基因玉米可用于农田生态系统的有害生物管理。
[ Background] Ladybird beetles （Coleoptera： Coccinellidae） are important predators in maize fields and prey on many different agricultural pest insects. They provide an important ecosystem service, and should not be harmed by new agricultural tech- niques. [ Method] Filed studies were conducted to determine whether transgenic Bt maize, expressing the crylAb toxin to control corn borers, has unintended impacts on ladybird beetle species richness, abundance of species and population dynamics of dominant species, with respect to an isogenic hybrid as control. Bt maize and its isogenic hybrid were planted in late of April and middle of June, as spring and summer maize, respectively, at Langfang, Hebei Province, China. [ Result] There were 8 species of ladybird beetles observed, including Propylaea japonica （Thunberg） , Harmonia axyridis （Pallas）, CoccineUa septempunctata （L.）, Scym- nus （Neopullus） babai Sasaji, Stethorus punctillum （Weise） , Scymnus folchinii （Canepari） , Scymnus inderihensis （Mulsant） , and Anisosticta kabensis （Lewis）. Few differences were found in species richness and abundance between the Bt and non-Bt maize fields, either in spring or summer corn field. The dominant species was P. japonica in the spring, and P. japonica and H. axyridis in the summer, respectively. No significant differences were observed in population dynamics of P. japonica and H. axyridis in spring and summer in the two types of fields. [ Conclusion and significance ] Bt corn expressing cryl Ab toxin had no significant effect on the observed parameters, therefore, this Bt maize hybrid may be suitable in an integrated pest management system.
出处
《生物安全学报》
2012年第2期130-134,共5页
Journal of biosafety
基金
转基因生物新品种培育科技重大专项(2011ZX08011-003)
作者简介
刘慧,女,农艺师,硕士。研究方向:转基因作物环境安全评价;通讯作者:王振营,E-mail:zywang@ippcaas.cn
