Phytopathology. 2006 Jan;96(1):111-4. doi: 10.1094/PHYTO-96-0111.
This study examined the role of the fungi Dactylella oviparasitica and Fusarium oxysporum in the beet-cyst nematode (Heterodera schachtii) suppressiveness exhibited by a southern Californian soil. In prior research, the abundance of D. oviparasitica rRNA genes positively correlated with high levels of suppressiveness, whereas the abundance of F. oxysporum rRNA genes positively correlated with minimal to moderate levels of suppressiveness. In this report, both fungi were added to fumigation-induced nonsuppressive soil, planted with Swiss chard, and infested with H. schachtii juveniles. After two nematode generations, D. oviparasitica strain 50 reduced the population densities of H. schachtii eggs and juveniles to those in the suppressive soil and H. schachtii cysts to levels lower than in the suppressive soil. F. oxysporum did not significantly reduce H. schachtii populations. These results suggest that D. oviparasitica strain 50 plays a major role in the suppression of H. schachtii population development in this southern Californian soil.
本研究探讨了真菌 Dactylella oviparasitica 和 Fusarium oxysporum 在南加州土壤中对甜菜胞囊线虫（Heterodera schachtii）抑制作用的影响。在先前的研究中，D. oviparasitica rRNA 基因的丰度与高水平的抑制作用呈正相关，而 F. oxysporum rRNA 基因的丰度与最低至中等水平的抑制作用呈正相关。在本报告中，将这两种真菌添加到熏蒸诱导的非抑制性土壤中，种植瑞士甜菜，并感染甜菜胞囊线虫幼虫。经过两代线虫后，D. oviparasitica 菌株 50 将 H. schachtii 卵和幼虫的种群密度降低到抑制性土壤中的水平，将 H. schachtii 胞囊降低到低于抑制性土壤中的水平。F. oxysporum 没有显著降低 H. schachtii 的种群。这些结果表明，D. oviparasitica 菌株 50 在南加州土壤中对 H. schachtii 种群发育的抑制作用中起主要作用。
