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New host record of Sclerotium rolfsii causing crown and root rot on Pseudogynoxis benthamii

Symptoms of a wilt disease were observed on 10 of 40 plants of Pseudogynoxis benthamii grown in Buenos Aires, Argentina, in March 2016. The aim of this study was to identify the causal agent of the disease. Five phenotypically identical fungal isolates were obtained from sclerotia that developed on...

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Main Authors: Rivera, Marta Carolina, Wright, Eduardo Roberto, Silvestro, Luciana Belén, Steinglein, Sebastián Alberto, Kato, Adriana Elena
Format: info:ar-repo/semantics/artículo
Language:Inglés
Published: Instituto de Biología, Universidad Nacional Autónoma de México 2022
Subjects:
Wilts
Inoculation
Soil Morphological Features
Soil Fungi
Marchitez
Inoculación
Características Morfológicas Suelo
Hongos del Suelo
Corticium rolfsii
Soilborne Fungi
Sclerotium rolfsii
Pseudogynoxis benthamii
Online Access:http://hdl.handle.net/20.500.12123/13072
http://revista.ib.unam.mx/index.php/bio/article/view/2187
https://doi.org/10.22201/ib.20078706e.2018.3.2187
Summary:Symptoms of a wilt disease were observed on 10 of 40 plants of Pseudogynoxis benthamii grown in Buenos Aires, Argentina, in March 2016. The aim of this study was to identify the causal agent of the disease. Five phenotypically identical fungal isolates were obtained from sclerotia that developed on the roots of wilted plants. One of them was inoculated onto healthy plants, and caused symptoms in 2 weeks. The pathogen was identified as Sclerotium rolfsii, on the basis of morphological characteristics. The nuclear ribosomal DNA internal transcribed spacer region of the isolate was PCR-amplified and sequenced. DNA analysis revealed a 99-100% similarity with S. rolfsii. This is the first report of S. rolfsii causing wilt on P. benthamii and the first pathogen reported on this plant species worldwide.

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