PERSONAL DE APOYO
TORNESELLO GALVAN Julieta
congresos y reuniones científicas
Título:
FU-26 Genetic characterization, fungicide sensitivity, and aphicidal potential of Lecanicillium fungi from Argentina
Autor/es:
ROMINA MANFRINO; CHRISTINA SCHUSTER; JULIETA TORNESELLO; KATHARINA SAAR ; JUAN J. GARCÍA; CLAUDIA C. LÓPEZ LASTRA; ANDREAS LECLERQUE
Lugar:
Mainz
Reunión:
Congreso; 47th ANNUAL MEETING of the SOCIETY FOR INVERTEBRATE PATHOLOGY and INTERNATIONAL CONGRESS ON INVERTEBRATE PATHOLOGY AND MICROBIAL CONTROL; 2014
Institución organizadora:
SOCIETY FOR INVERTEBRATE PATHOLOGY
Resumen:
Mitosporic fungi of the genus Lecanicillium (Ascomycota; Hypocreales) are of particular
interest as biological control agents for phloem-sucking plant pests including
aphids. Bioprospection for these fungi in Argentina has given rise to a set of
single-spore derived Lecanicillium
strains isolated from a
wide range of original hosts.
Current species delineation within the taxonomic genus Lecanicillium that consists of the three "core
species" Lecanicillium
lecanii, L. muscarium, and
L. longisporum as well as further less closely related
species, is not free of ambiguity. For species-level characterization of Lecanicillium isolates, a set of five genetic markers
comprising one mitochondrial (NMS) and two nuclear (ITS, IGS) ribosomal RNA
operan together with one mitochondrial (ñadí) and
one nuclear (efla)
protein-encoding
sequences, has been employed. The aggregated information from these markers
indicates that fungal isolates from Argentina mainly, but not exclusively
belong to the Lecanicillium
core species. Moreover,
the set of Lecanicillium
strains has been
investigated for fungicide sensitivity. Between strain differences in
susceptibilities have been found to be important and not necessarily in line
with systematics, making careful determination of sensitivity to agriculturally
used fungicides an important criterion of biocontrol agent selection. However,
the fungicidal polyketide compound soraphen has been found of outstanding
activity against a wide variety of isolates from all species investigated. On
the basis of these results, a subset of strains has been selected for virulence
bioassays against the green peach aphid, Myzus persicae, an important agricultural pest in Argentina and other parts of the
world.