Abstract

MARIN-PAVAS, Duber Alexander et al. Nematicidal potential of fungi isolated of Plantain crops (Musa AAB Simmonds) from southwest Antioquia. Rev. colomb. biotecnol [online]. 2022, vol.24, n.1, pp.46-55.  Epub Sep 01, 2022. ISSN 0123-3475.  https://doi.org/10.15446/rev.colomb.biote.v24n1.99038.

The aim of this work was to evaluate the nematicidal potential of fungal isolates from plantain crops in the municipalities of Andes and Jardín (Southwest Antioquia). Ten fungal isolates were analyzed in vitro against phytoparasitic nematodes of the genera Meloidogyne and Radopholus. The fungi belonged to the genera Paecilomyces, Pochonia, Arthrobotrys, Lecanicillium, and Metarhizium. Qualitative metabolic tests were carried out with various substrates to observe the degradation capacity of different characteristic compounds in the structure of nematode eggs or juveniles. Also, the ability to colonize eggs or juveniles of Meloidogyne sp. and, the mortality of the isolates against the genera Meloidogyne and Radopholus were evaluated. It was found that most isolates were capable of degrading Tween 80 (90% of isolates), followed by casein (80%), gelatin (80%), Tween 20 (60%), and to a lesser extent chitin (40 % of isolates); in addition, 30% of the isolates presented crystal formation in the Tween media. 70% of the isolates could infect eggs, while the remaining 30% infected juveniles (J2) of Meloidogyne sp., after 24 hours of incubation. Regarding the percentage of mortality of the fungus and the filtrate, it was found that all the isolates differ from the control (p<0.05), and some isolates of the genera Pochonia and Paecilomyces who presented mortality percentages higher than 90%.

Keywords : Antagonism; biocontrol; Meloidogyne; Radopholus; Paecilomyces; Pochonia.

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