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First report of Berkeleyomyces basicola (synonymous: Thielaviopsis basicola) on roots of sweet potato (Ipomoea batatas (L.) Lam) in Argentina

Symptomatic sweet potato cv Arapey INIA samples were collected from a commercial production field in Colonia Molina, Guaymallén department, Mendoza province, Argentina. They showed dark rounded lesions, sometimes coalescing with white granular mycelium. Fungus was obtained from symptomatic sweet pot...

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Autores principales: Martino, Julia Andrea, Di Feo, Liliana Del Valle, Paccioretti, Mauro Andres, Contardi, Clara Adriana, Sanchez, Miguel Alejandro, Ortega, Leandro Ismael, Pastor, Silvina Estela
Formato: info:ar-repo/semantics/artículo
Lenguaje:Inglés
Publicado: Facultad de Ciencias Agrarias, Universidad Nacional de Cuyo 2021
Materias:
Ipomoea Batatas
Thielaviopsis Basicola
Argentina
Podredumbre de la Raíz
Batata
Enfermedades de las Plantas
Root Rots
Fungal Diseases
Sweet Potatoes
Plant Diseases
Enfermedades Fungosas
Chalara Elegans
Enfermedad Fúngica en Batata
Sweet Potato Fungal Disease
Acceso en línea:http://hdl.handle.net/20.500.12123/10179
https://revistas.uncu.edu.ar/ojs/index.php/RFCA/article/view/4898
https://doi.org/10.48162/rev.39.027
Sumario:Symptomatic sweet potato cv Arapey INIA samples were collected from a commercial production field in Colonia Molina, Guaymallén department, Mendoza province, Argentina. They showed dark rounded lesions, sometimes coalescing with white granular mycelium. Fungus was obtained from symptomatic sweet potatoes, which represented the generalized infection that affected the crop. They were seeded in PDA with streptomycin sulfate and incubated for seven days at 21°C, alternating white/black (UV400nm) light. Observations with an optical microscope revealed the presence of hyaline, not septated, cylindrical endoconidia with rounded ends. They were 8-16 μm length and 4–6 μm width. Phialides were 43-46 μm length, rounded bases (7-9 μm width) and tapering to the neck´s tip (4-6 μm width). Brown chlamydospores (aleuriospores), 9-13 μm length and 8-12 μm width, in chains of 2-8 spores were observed. For molecular identification, total genomic DNA was extracted. ITS fragment of 565 pb was amplified using ITS5/ITS4 primers and sequenced. The sequence indicated 99% identity with Berkeleyomyces basicola (synonymous: Thielaviopsis basicola). This was deposited in GenBank as (KX580957) (CBS: C430.74, Gen Bank accession number AF275482.1). This is the first report of B. basicola in sweet potato in Argentina, a potential threat to storage root yields.

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