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Article

Genetic Diversity of Fusarium oxysporum f. sp. cubense, the Fusarium Wilt Pathogen of Banana, in Ecuador

1
Facultad de Ciencias de la Vida, Escuela Superior Politécnica del Litoral, Campus Gustavo Galindo Km. 30.5 Vía Perimetral, Guayaquil 09015863, Ecuador
2
Centro de Investigaciones Biotecnológicas del Ecuador, Escuela Superior Politécnica del Litoral, Campus Gustavo Galindo Km. 30.5 Vía Perimetral, Guayaquil E C090112, Ecuador
3
Department of Plant Pathology and Environmental Microbiology, The Pennsylvania State University, University Park, PA 16802, USA
*
Author to whom correspondence should be addressed.
Plants 2020, 9(9), 1133; https://doi.org/10.3390/plants9091133
Received: 3 August 2020 / Revised: 27 August 2020 / Accepted: 28 August 2020 / Published: 1 September 2020
(This article belongs to the Collection Feature Papers in Plant Protection)
The continued dispersal of Fusarium oxysporum f. sp. cubense Tropical race 4 (FocTR4), a quarantine soil-borne pathogen that kills banana, has placed this worldwide industry on alert and triggered enormous pressure on National Plant Protection (NPOs) agencies to limit new incursions. Accordingly, biosecurity plays an important role while long-term control strategies are developed. Aiming to strengthen the contingency response plan of Ecuador against FocTR4, a population biology study—including phylogenetics, mating type, vegetative compatibility group (VCG), and pathogenicity testing—was performed on isolates affecting local bananas, presumably associated with race 1 of F. oxysporum f. sp. cubense (Foc). Our results revealed that Foc populations in Ecuador comprise a single clonal lineage, associated with VCG0120. The lack of diversity observed in Foc populations is consistent with a single introduction event from which secondary outbreaks originated. The predominance of VCG0120, together with previous reports of its presence in Latin America countries, suggests this group as the main cause of the devastating Fusarium wilt epidemics that occurred in the 1950s associated to the demise of ‘Gros Michel’ bananas in the region. The isolates sampled from Ecuador caused disease in cultivars that are susceptible to races 1 and 2 under greenhouse experiments, although Fusarium wilt symptoms in the field were only found in ‘Gros Michel’. Isolates belonging to the same VCG0120 have historically caused disease on Cavendish cultivars in the subtropics. Overall, this study shows how Foc can be easily dispersed to other areas if restriction of contaminated materials is not well enforced. We highlight the need of major efforts on awareness and monitoring campaigns to analyze suspected cases and to contain potential first introduction events of FocTR4 in Ecuador. View Full-Text
Keywords: Fusarium wilt; banana; tropical race 4; clonal lineage; biosecurity; Ecuador Fusarium wilt; banana; tropical race 4; clonal lineage; biosecurity; Ecuador
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MDPI and ACS Style

Magdama, F.; Monserrate-Maggi, L.; Serrano, L.; García Onofre, J.; Jiménez-Gasco, M.d.M. Genetic Diversity of Fusarium oxysporum f. sp. cubense, the Fusarium Wilt Pathogen of Banana, in Ecuador. Plants 2020, 9, 1133. https://doi.org/10.3390/plants9091133

AMA Style

Magdama F, Monserrate-Maggi L, Serrano L, García Onofre J, Jiménez-Gasco MdM. Genetic Diversity of Fusarium oxysporum f. sp. cubense, the Fusarium Wilt Pathogen of Banana, in Ecuador. Plants. 2020; 9(9):1133. https://doi.org/10.3390/plants9091133

Chicago/Turabian Style

Magdama, Freddy, Lorena Monserrate-Maggi, Lizette Serrano, José García Onofre, and María d.M. Jiménez-Gasco 2020. "Genetic Diversity of Fusarium oxysporum f. sp. cubense, the Fusarium Wilt Pathogen of Banana, in Ecuador" Plants 9, no. 9: 1133. https://doi.org/10.3390/plants9091133

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