Guava (Psidium guajava L.) production is prominent in the irrigated fruit growing area of Brazil. However, the parasite Meloidogyne enterolobii (a phytonematode) has caused a decrease in guava production. Arbuscular mycorrhizal fungi (AMF) are known to be beneficial to plants; however, their ability to protect plants against nematodes such as M. enterolobii remains poorly known. This study aimed to monitor M. enterolobii infection in guava seedlings inoculated with three AMF species. After AMF inoculation, the seedlings were grown in sterile soil for 60 days before inoculation with 2000 M. enterolobii eggs. Plant growth parameters, mycorrhizal colonization and the number of Meloidogyne in the roots were determined over time (30 and 60 days after Meloidogyne inoculation). The AMF enhanced guava seedling growth, and reduced the amount of Meloidogyne in the roots at 30 and 60 days after nematode inoculation, indicating that these AMF species could serve as biocontrol agents of M. enterolobii in guava cultivation.

中文翻译：

---

丛枝菌根真菌减少番石榴幼苗根结线虫感染

番石榴 (番石榴L.) 产量在巴西的灌溉水果种植区非常突出。然而，寄生虫根结线虫（一种植物线虫病）导致番石榴产量下降。已知丛枝菌根真菌 (AMF) 对植物有益；然而，它们保护植物免受线虫侵害的能力，例如M. enterolobii仍然鲜为人知。本研究旨在监测M. enterolobii接种三种 AMF 的番石榴幼苗感染。接种 AMF 后，幼苗在无菌土壤中生长 60 天，然后接种 2000M. enterolobii蛋。植物生长参数，菌根定植和数量根结线虫随着时间的推移（30 天和 60 天后根结线虫接种）。AMF 促进番石榴幼苗生长，减少根结线虫线虫接种后 30 天和 60 天的根部，表明这些 AMF 物种可以作为线虫的生物防治剂。M. enterolobii在番石榴种植中。