Screening culture filtrates of fungi for activity against Tylenchulus semipenetrans
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Fecha de publicación
2009-12-01ISSN
1695-971X
Resumen
Culture filtrates of 20 fungi isolated from citrus soils were screened for their activity against Tylenchulus
semipenetrans in both in vitro and greenhouse tests. The filtrates of Talaromyces cyanescens (isolates 2-4 and 2-5),
Paecilomyces lilacinus, Chaetomium robustum, Acremonium strictum, Engyodontium album, Myrothecium verrucaria,
Emericella rugulosa, and Tarracomyces gigaspora consistently inhibited the motility of second-stage juveniles at
various concentrations of the filtrate. Dose-response models were used to determine the filtrate concentration required
to inhibit the motility of 50% of the juveniles (CI50). The culture filtrate of P. lilacinus showed the highest activity
with a CI50 value of 58% that differed from that of C. robustum (CI50 = 68%), and A. strictum CI50 = 82%. The culture
filtrates of P. lilacinus, E. album, and T. cyanescens 2-5 maintained their activity when autoclaved at 120ºC for 20
min. The autoclaved filtrate of T. cyanescens 2-4 was more effective at inhibiting juvenile motility (CI50 = 28%) than
that of T. cyanescens 2-5 (CI50 = 80%), C. robustum (CI50 = 72 %) and P. lilacinus (CI50 = 72%). The culture filtrate
of T. cyanescens 2-4 also inhibited egg hatching. Nematode reproduction on Cleopatra mandarin and Carrizo citrange
were respectively reduced by the culture filtrate of P. lilacinus and the autoclaved filtrate of T. cyanescens 2-4. These
results support the hypothesis that soil fungi may contribute to regulate nematode densities by the production of
secondary metabolites with nematicidal activity.
Tipo de documento
Artículo
Versión del documento
Versión publicada
Lengua
English
Materias (CDU)
632 - Enfermedades y protección de las plantas
Páginas
9
Publicado por
Consejo Superior de Investigaciones Científicas
Publicado en
Spanish Journal of Agricultural Research
Citación
Lucas, S. Verdejo, A. Viera, A.M. Stchigel, and F.J. Sorribas. 2009. “Screening Culture Filtrates of Fungi for Activity Against Tylenchulus Semipenetrans.” Spanish Journal of Agricultural Research 7 (4): 896-904. doi: 10.5424/sjar/2009074-1103
Número del acuerdo de la subvención
INIA/Programa Nacional de Recursos y Tecnologías Agroalimentarias/RTA2005-00086-00-00/ES/Control de Tylenchulus semipenetrans mediante métodos biológicos, genéticos y culturales compatilbes con la producción integrada de cítricos/
Program
Protecció Vegetal Sostenible
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