Nematicidal activity of Gymnoascus reesii against Meloidogyne incognita

Abstract

In the present investigation, antagonistic effect of culture filtrates of Gymnoascus reesii at different concentrations were tested on eggs and juveniles of root knot nematode (Meloidogyne incoginta), in vitro. The percentage mortality and inhibition of hatching of root-knot nematode were directly proportional to the concentration of culture filtrates of G. reesii. Compared with the nematicides treatments of Cadusafos and Avermectins, the effects of higher concentration of culture filtrates of G. reesii were in some cases not statistically different. To our knowledge, this is the first report of culture filtrates of G. reesii observed to have nematicidal activity toward root-knot nematode and a nematicidal metabolite (3E,5E)-2,5-dihydroxy-2,7-dihydrooxepine-3-carboxylic anhydride was isolated based on bioassay-guided fractionation from the extracts of the fungus G. reessii.

Proteins of Pycnoporus sanguineus have nematicide activity and induce resistance to Meloidogyne spp. in Micro-Tom tomato plants

“…Accordingly, these studies confirm the efficiency of basidiomycete extracts to inhibit nematodes (Dong et al 2006;Ishizaki;HAHN et al 2019;Themuhi et al 2020). Some compounds that present nematostatic and nematicide action were already identified, just as those extracted from P. ostreatus, which was featured as toxin similar to peroxides, inhibiting 95% the motility of Bursaphelenchus xylophilus (Kwok et al 1992), besides fatty acids such as choriolic and linoleic (Stadler et al 1994;Li et al 2007;Liu et al 2011;Bua-Art et al 2011;Sivanandhan et al 2017), aldehydes such as 5-pentyl-2-furaldehyde and 5(4-penteny)-2-furaldehyde isolated from Irpex lacteus (Hayashi et al 1981), phenolic compounds (Ferreira et al 2009;Degenkolb and Vilcinskas 2016) and pentadecanoic acid, octadecadienoic acid, octadecanoic acid, and the terpene β-sitosterol (Chaurasia et al 2020). There are also paralyzing toxins extracted from Pleurotus cystidiosus (Luo et al 2004).…”