INVESTIGADORES
MURUA maria Gabriela
artículos
Título:
Genetic characterization of fall armyworm (Lepidoptera: Noctuidae) host strains in Argentina
Autor/es:
NAGOSHI RODNEY N.; MURÚA M. GABRIELA; HAY-ROE MIRIAN; JUÁREZ M. LAURA; WILLINK EDUARDO; MEAGHER ROBERT L.
Revista:
JOURNAL OF ECONOMIC ENTOMOLOGY
Editorial:
ENTOMOLOGICAL SOC AMER
Referencias:
Lugar: Lanham; Año: 2012 vol. 2 p. 418 - 428
ISSN:
0022-0493
Resumen:
Fall armyworm is a major economic pest throughout the Western Hemisphere. Previous
studies of populations in the southern United States, Brazil, and the Caribbean demonstrated the
existence of two morphologically identical but genetically distinct host strains that can only be distinguished
using genetic markers, including polymorphisms in the mitochondrial Cytochrome Oxidase
I (COI) gene and in the Z-chromosome linked Triose phosphate isomerase (Tpi) gene. The strains differ
in some physiological and behavioral characteristics, most notably their preference for different plant
hosts, but are capable of hybridizing in the laboratory and in the Þeld. These traits suggest that the
strains are in the process of divergence, which may or may not be hemispheric in scope. The objective
of this study was to determine whether the two strains are present in Argentina. It was found that the
strain-diagnostic haplotypes of the COI and Tpi genes subdivided the Argentina population into two
major groups. Each group displayed biases in their distribution among different host plants that were
generally consistent with expected strain behavior. The overall results indicated that Argentina fall
armyworm exhibit similar genetics and behavior to populations in the rest of the hemisphere. In
addition, the Argentina populations had comparable haplotype frequencies to those from Brazil and
Texas, consistent with possible interactions with these fall armyworm groups, but appeared to have
had minimal exchanges with those from Puerto Rico or Florida.