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首页> 外文期刊>Cotton Reseach Journal >Field Assessment of Transgenic Cottons Expressing Cry 1 Ac gene on Selected Soil Biological Attributes and Culturable Microbial Diversity in Deep Vertisols
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Field Assessment of Transgenic Cottons Expressing Cry 1 Ac gene on Selected Soil Biological Attributes and Culturable Microbial Diversity in Deep Vertisols

机译：表达Cry 1 Ac基因的转基因棉花对深层垂直土壤中某些土壤生物学特性和可培养微生物多样性的现场评估

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摘要

Three transgenic Bt cotton hybrids {Gossypium hirsutum L.) (Bunny, Jai, and Ankur 651) expressing Cry 1 Ac gene were evaluated for their effects on selected soil biological properties [respiration, microbial biomass carbon (MBC), dehydrogenase activity (DHA), urease activity, culturable microbial population and diversity and nutrient dynamics] at different crop growth stages, under field condition in deep Vertisol. All the selected biological attributes were found to reach their maximum activity at flowering and boll formation stages. Respiration rate and MBC were the highest in the soil under B^cotton followed by non-,uJ/ soil and by the control bulk soil indicating no adverse effects of Bt cotton on soil microbial activity. Urease and dehydrogenase activities, potentially available nitrogen (N) and overall microbial activity in the soil, respectively, increased in the sequence no-crop variant < non-B? soil < soil under Bf-cotton. A decrease in soil pH was observed in Bt cotton grown soil, while available N and exchangeable potassium were significantly {P <0.01) higher in Bt cotton compared to non-Br cotton. Significantly higher (P <0.01) culturable microbial population and microbial diversity indices were recorded in Bt cotton grown soil compared to non-6f cotton soil. Temporal variations observed between Bt and non-Bt cottons on soil nutrient uptake, enzyme activities, and biological activities may be due to differences in genetic makeup of the cotton hybrids and growth stages rather than geneexpression. These results suggest that cultivation of Bt cotton expressing Cry 1 Ac gene may not pose ecological or environmental risk.
机译：评价了三个表达Cry 1 Ac基因的转基因Bt棉杂交种（Gossypium hirsutum L.）（Bunny，Jai和Ankur 651）对选定土壤生物学特性的影响[呼吸，微生物生物量碳（MBC），脱氢酶活性（DHA）田间条件下深Vertisol中不同作物生长阶段的尿素酶活性，可培养的微生物种群以及多样性和养分动态]。发现所有选择的生物学特性在开花和铃形成阶段达到其最大活性。 B棉在土壤中的呼吸速率和MBC最高，其次是非U /土壤和对照块状土壤，表明Bt棉花对土壤微生物活性没有不利影响。尿素酶和脱氢酶活性，潜在的氮（N）和土壤中的整体微生物活性分别以无作物变体<非B？土壤

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