INVESTIGADORES
STENGLEIN Sebastian Alberto
artículos
Título:
Evaluation of tolerance to Fusarium oxysporum and Fusarium solani in Virginia-type tobacco (Nicotiana tabacum L.) varieties under controlled conditions in Northwestern Argentina
Autor/es:
BERRUEZO L.; HARRIES E.; GALVÁN M.Z.; STENGLEIN S.A.; MERCADO CÁRDENAS G.
Revista:
REVISTA DE LA FACULTAD DE CIENCIAS AGRARIAS DE LA UNIVERSIDAD NACIONAL DE CUYO
Editorial:
UNIV NACIONAL CUYO
Referencias:
Lugar: Mendoza; Año: 2021 vol. 53 p. 214 - 224
ISSN:
0370-4661
Resumen:
The production of Tobacco (Nicotiana tabacum L.) in Argentina is centred in the northwestern region (NWA), where the incidence of root rots and stem diseases has increased considerably in recent years. Vascular wilt and root rot produced by members of the Fusarium oxysporum and Fusarium solani complexes are among the most prevalent diseases. This study aimed to evaluate the pathogenicity levels of isolates of the F. oxysporum and F. solani complexes in different varieties of Virginia Type tobacco and analyze the influence of inoculum concentration on the expression of tobacco vascular wilt and root rot. The commercial varieties MB47, PVH229, NC71, K346, K326 and K394 were inoculated with six isolates of both complexes, using two inoculum concentrations. The variables evaluated were the incidence (I) and severity (S) of the symptoms as well as fresh and dry weight of the roots. The area under the disease progress curves (AUDPC) were calculated and subjected to analysis of variance (ANOVA). Also, disease epidemiological models were fitted to the experimental data. Disease incidence and AUDPC were influenced both by the varieties and the isolates. The MB47 variety was significantly less infected than the others in relation to all the isolates evaluated. The varieties K346, K326, K394 had the higher AUDPC means showing a susceptible behavior in front of all the isolates of Fusarium. The disease intensity curves were adequately described by the monomolecular and logistic models. The F. oxysporum isolates maintained the same level of aggressiveness for the two dilutions evaluated, while the F. solani isolates increased the severity at higher inoculum concentration. The results generated in the present study provides for the first time information about the levels of tolerance to vascular wilt and root rot under controlled conditions for the main varieties of Virginia-type tobacco grown in NWA.