不同生长期转Bt基因水稻秸杆还土对淹水土壤酶活性的影响

在实验室条件下通过秸杆还土试验比较了不同生长期转Bt基因克螟稻及其亲本稻秸杆对淹水土壤酶活性的影响。研究结果表明，与同一生长期的亲本稻秸杆相比，孕穗期和成熟期克螟稻秸杆对淹水土壤磷酸酶活性的影响较小；相反，对淹水土壤脱氢酶活性的影响非常显著，并且孕穗期秸杆与成熟期秸杆的添加对淹水土壤脱氢酶活性的影响趋势也存在较大差异。推测造成淹水土壤脱氢酶活性的显著性差异的主要原因可能是由于Bt插入基因表达的多效性所致。结果认为土壤脱氢酶活性可作为转Bt基因水稻生态安全风险性评价的潜在指标。

Enzyme activities variation in flooded soils amended with Bt transgenic rice straws at different stages of plant development

The transformation of genes from Bacillus thuringiensis (Bt) that code for the production of insecticidal toxins into crops reduces the pollution associated with the application and run off of chemical pesticides, because the toxins are produced continuously within these plants. However, there is increasing concern that these crops may pose risks to natural and agricultural ecosystems. So far, most of the research has focused on upland crops, such as Bt corn, and Bt potato. No studies have been carri...