食细菌线虫Caenorhabditis elegans的取食偏好性

通过设置平板培养试验，以模式种线虫 Caenorhabditis elegans 为材料，观察了食细菌线虫的取食行为。结果表明：C. elegans 在取食细菌时对原位土壤中分离的一种Pseudomonas sp细菌存在最大的取食偏好性。这种取食偏好性表现在大部分C. elegans 在24 h内都直接朝Pseudomonas sp迁移，说明C. elegans能通过某种机制识别Pseudomonas sp。距离迁移试验及C. elegans迁移率表明它可能是通过辨别细菌所发出的气味识别它喜欢的食物。C. elegans的繁殖率跟其取食的偏好性是相关的，在迁移率较高的细菌培养基中线虫表现出更高的繁殖率。结果还表明：相对于G+细菌而言， C. elegans 偏好取食G-细菌。为进一步了解土壤生态系统中食细菌线虫与细菌群落结构间相互关系提供了帮助。

Feeding preference of nematode Caenorhabditis elegans on soil microorganisms

Bacterial feeding nematodes are the most abundant and extensively distributed faunas in soils.Previous studies demonstrated that they exhibit pronounced preference when they feed on their food.This feeding preference on soil microorganisms could alter the microbial community structure and subsequently soil ecological processes.However,there were few studies reported on how the bacterial feeding nematodes distinguish between their foods.In this study,we set a plate culture experiment with Caenorhabditis eleg...