PDF(Pubmed)
Abstract：
As the most abundant animal in the soil, nematodes are directly or indirectly involved in almost all soil ecological processes. Studying soil nematode population regulation is essential to understanding soil ecological processes. This study found urea combines nematode-trapping fungi to regulate the population of soil nematodes. In soil, compared with no urea, adding 0.2 mg/mL urea after applying Arthrobotrys oligospora and Dactylellina ellipsospora reduced the number of nematodes by 34.7% and 31.7%. Further, the mechanism of urea couple nematode-trapping fungi to regulate the nematode population was explored in the medium environment. The results showed that the addition of 0.2 mg/ml urea accelerated the trap formation of A. oligospora and D. ellipsosporas by 50% and 46.5%, and increased the yield of traps of A. oligospora and D. ellipsosporas by 39.5% and 40.6%, thus, the predatory efficiency of A. oligospora and D. ellipsospora on nematodes was increased by 34.2% and 32.7%. In conclusion, urea regulates the predation ability of A. oligospora and D. ellipsosporas to regulate the soil nematode population. This study deepens the understanding of the regulatory pathways of the soil nematodes but also provides a potential new strategy for harmful nematode bio-control.
摘要：
作为土壤中最丰富的动物，线虫直接或间接参与几乎所有的土壤生态过程。研究土壤线虫种群调控对理解土壤生态过程至关重要。这项研究发现尿素结合了线虫诱捕真菌来调节土壤线虫的种群。在土壤中,与没有尿素相比，施用Arthrobotrys寡孢子和Dactylellina椭球孢子后添加0.2mg/mL尿素可使线虫数量减少34.7％和31.7％。Further,在培养基环境中探讨了尿素对线虫捕获真菌调节线虫种群的机制。结果表明，添加0.2mg/ml尿素可使A.olvospora和D.ellisosporas的陷阱形成加速50％和46.5％，并使A.oligospora和D.ellisosporas的诱捕率分别提高了39.5％和40.6％，因此，A.寡孢菌和D.椭圆孢菌对线虫的捕食效率分别提高了34.2%和32.7%。总之,尿素调节寡孢菌和椭球孢菌的捕食能力，从而调节土壤线虫种群。该研究加深了对土壤线虫调控途径的理解，也为有害线虫的生物防治提供了潜在的新策略。
