Morfologia de conídios e patogenicidade de isolados de Exserohilum turcicum da Argentina e do Brasil em milho

Autores
De Rossi, Roberto Luis; Reis, Erlei Melo; Brustolin, Ricardo
Año de publicación
2014
Idioma
portugués
Tipo de recurso
artículo
Estado
versión aceptada
Descripción
Corn crop is one of the most important commodities in Argentina and Brazil. Its yield is reduced by different pathogens such as Exserohilum turcicum (Et), the causal agent of Northern leaf blight in corn. This study aimed to compare the morphological characteristics of conidia and the pathogenicity of ten Et isolates obtained from Argentina and Brazil. Five monosporic isolates from each country were cultured on lactose casein hydrolysate agar (LCHA) for 15 days at 25 ± 2ºC in the absence of light. Microscopic slides were prepared to measure 200 conidia of each isolate. On average, conidia measured 10-25 x 30-135 µm, presenting 2-8 septa. Statistical differences (p = 0.05) were detected among the 10 Et isolates for all measured variables (length, width and number of septa). Despite such variation, the recorded characteristics coincided with those reported in the literature. For pathogenicity tests, corn hybrid plants Pioneer P1630H, of known susceptibility to Et, were inoculated by the deposition of 0.5 ml of an Et conidial suspension at the concentration of 5x104 conidia/mL, in the whorl, when the fourth leaf was expanded. All ten isolates produced, after the 15 days of inoculation, an average of 2.5 lesions/leaf, of 39.7 x 3.4 mm length and width, respectively, and 4% estimated severity. There were no significant differences in the pathogenicity of all ten studied isolates for any of the pathometric criteria. There were morphological differences between isolates from Argentina and Brazil but not in pathogenicity. This confirms that the isolates used in this study belong to the species Et.
Fil: De Rossi, Roberto Luis. Universidad Católica de Córdoba. Facultad de Ciencias Agropecuarias; Argentina
Fuente
De Rossi, Roberto Luis ORCID: https://orcid.org/0000-0003-0130-5415 , Reis, Erlei Melo and Brustolin, Ricardo (2014) Morfologia de conídios e patogenicidade de isolados de Exserohilum turcicum da Argentina e do Brasil em milho. Summa Phytopathologica, 41 (1). pp. 58-63. ISSN 0100-5405
Materia
S Agricultura (General)
SB Cultura de la planta
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
Repositorio
Producción Académica (UCC)
Institución
Universidad Católica de Córdoba
OAI Identificador
oai:pa.bibdigital.uccor.edu.ar:2258

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network_name_str Producción Académica (UCC)
spelling Morfologia de conídios e patogenicidade de isolados de Exserohilum turcicum da Argentina e do Brasil em milhoDe Rossi, Roberto LuisReis, Erlei MeloBrustolin, RicardoS Agricultura (General)SB Cultura de la plantaCorn crop is one of the most important commodities in Argentina and Brazil. Its yield is reduced by different pathogens such as Exserohilum turcicum (Et), the causal agent of Northern leaf blight in corn. This study aimed to compare the morphological characteristics of conidia and the pathogenicity of ten Et isolates obtained from Argentina and Brazil. Five monosporic isolates from each country were cultured on lactose casein hydrolysate agar (LCHA) for 15 days at 25 ± 2ºC in the absence of light. Microscopic slides were prepared to measure 200 conidia of each isolate. On average, conidia measured 10-25 x 30-135 µm, presenting 2-8 septa. Statistical differences (p = 0.05) were detected among the 10 Et isolates for all measured variables (length, width and number of septa). Despite such variation, the recorded characteristics coincided with those reported in the literature. For pathogenicity tests, corn hybrid plants Pioneer P1630H, of known susceptibility to Et, were inoculated by the deposition of 0.5 ml of an Et conidial suspension at the concentration of 5x104 conidia/mL, in the whorl, when the fourth leaf was expanded. All ten isolates produced, after the 15 days of inoculation, an average of 2.5 lesions/leaf, of 39.7 x 3.4 mm length and width, respectively, and 4% estimated severity. There were no significant differences in the pathogenicity of all ten studied isolates for any of the pathometric criteria. There were morphological differences between isolates from Argentina and Brazil but not in pathogenicity. This confirms that the isolates used in this study belong to the species Et.Fil: De Rossi, Roberto Luis. Universidad Católica de Córdoba. Facultad de Ciencias Agropecuarias; ArgentinaAsociaci�n de Fitopatolog�a del Estado de S�o Paulo (APF)2014-12-19info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://pa.bibdigital.ucc.edu.ar/2258/1/A_DeRossi_Brsutolin_Reis.pdf De Rossi, Roberto Luis ORCID: https://orcid.org/0000-0003-0130-5415 <https://orcid.org/0000-0003-0130-5415>, Reis, Erlei Melo and Brustolin, Ricardo (2014) Morfologia de conídios e patogenicidade de isolados de Exserohilum turcicum da Argentina e do Brasil em milho. Summa Phytopathologica, 41 (1). pp. 58-63. ISSN 0100-5405 reponame:Producción Académica (UCC)instname:Universidad Católica de Córdobaporhttp://pa.bibdigital.ucc.edu.ar/2258/http://www.summanet.com.br/summanet-site/site/revista.phpinfo:eu-repo/semantics/altIdentifier/doi/10.1590/0100-5405/1948info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/4.0/deed.es2025-09-29T14:29:15Zoai:pa.bibdigital.uccor.edu.ar:2258instacron:UCCInstitucionalhttp://pa.bibdigital.uccor.edu.ar/Universidad privadaNo correspondehttp://pa.bibdigital.uccor.edu.ar/cgi/oai2bibdir@uccor.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:27182025-09-29 14:29:15.845Producción Académica (UCC) - Universidad Católica de Córdobafalse
dc.title.none.fl_str_mv Morfologia de conídios e patogenicidade de isolados de Exserohilum turcicum da Argentina e do Brasil em milho
title Morfologia de conídios e patogenicidade de isolados de Exserohilum turcicum da Argentina e do Brasil em milho
spellingShingle Morfologia de conídios e patogenicidade de isolados de Exserohilum turcicum da Argentina e do Brasil em milho
De Rossi, Roberto Luis
S Agricultura (General)
SB Cultura de la planta
title_short Morfologia de conídios e patogenicidade de isolados de Exserohilum turcicum da Argentina e do Brasil em milho
title_full Morfologia de conídios e patogenicidade de isolados de Exserohilum turcicum da Argentina e do Brasil em milho
title_fullStr Morfologia de conídios e patogenicidade de isolados de Exserohilum turcicum da Argentina e do Brasil em milho
title_full_unstemmed Morfologia de conídios e patogenicidade de isolados de Exserohilum turcicum da Argentina e do Brasil em milho
title_sort Morfologia de conídios e patogenicidade de isolados de Exserohilum turcicum da Argentina e do Brasil em milho
dc.creator.none.fl_str_mv De Rossi, Roberto Luis
Reis, Erlei Melo
Brustolin, Ricardo
author De Rossi, Roberto Luis
author_facet De Rossi, Roberto Luis
Reis, Erlei Melo
Brustolin, Ricardo
author_role author
author2 Reis, Erlei Melo
Brustolin, Ricardo
author2_role author
author
dc.subject.none.fl_str_mv S Agricultura (General)
SB Cultura de la planta
topic S Agricultura (General)
SB Cultura de la planta
dc.description.none.fl_txt_mv Corn crop is one of the most important commodities in Argentina and Brazil. Its yield is reduced by different pathogens such as Exserohilum turcicum (Et), the causal agent of Northern leaf blight in corn. This study aimed to compare the morphological characteristics of conidia and the pathogenicity of ten Et isolates obtained from Argentina and Brazil. Five monosporic isolates from each country were cultured on lactose casein hydrolysate agar (LCHA) for 15 days at 25 ± 2ºC in the absence of light. Microscopic slides were prepared to measure 200 conidia of each isolate. On average, conidia measured 10-25 x 30-135 µm, presenting 2-8 septa. Statistical differences (p = 0.05) were detected among the 10 Et isolates for all measured variables (length, width and number of septa). Despite such variation, the recorded characteristics coincided with those reported in the literature. For pathogenicity tests, corn hybrid plants Pioneer P1630H, of known susceptibility to Et, were inoculated by the deposition of 0.5 ml of an Et conidial suspension at the concentration of 5x104 conidia/mL, in the whorl, when the fourth leaf was expanded. All ten isolates produced, after the 15 days of inoculation, an average of 2.5 lesions/leaf, of 39.7 x 3.4 mm length and width, respectively, and 4% estimated severity. There were no significant differences in the pathogenicity of all ten studied isolates for any of the pathometric criteria. There were morphological differences between isolates from Argentina and Brazil but not in pathogenicity. This confirms that the isolates used in this study belong to the species Et.
Fil: De Rossi, Roberto Luis. Universidad Católica de Córdoba. Facultad de Ciencias Agropecuarias; Argentina
description Corn crop is one of the most important commodities in Argentina and Brazil. Its yield is reduced by different pathogens such as Exserohilum turcicum (Et), the causal agent of Northern leaf blight in corn. This study aimed to compare the morphological characteristics of conidia and the pathogenicity of ten Et isolates obtained from Argentina and Brazil. Five monosporic isolates from each country were cultured on lactose casein hydrolysate agar (LCHA) for 15 days at 25 ± 2ºC in the absence of light. Microscopic slides were prepared to measure 200 conidia of each isolate. On average, conidia measured 10-25 x 30-135 µm, presenting 2-8 septa. Statistical differences (p = 0.05) were detected among the 10 Et isolates for all measured variables (length, width and number of septa). Despite such variation, the recorded characteristics coincided with those reported in the literature. For pathogenicity tests, corn hybrid plants Pioneer P1630H, of known susceptibility to Et, were inoculated by the deposition of 0.5 ml of an Et conidial suspension at the concentration of 5x104 conidia/mL, in the whorl, when the fourth leaf was expanded. All ten isolates produced, after the 15 days of inoculation, an average of 2.5 lesions/leaf, of 39.7 x 3.4 mm length and width, respectively, and 4% estimated severity. There were no significant differences in the pathogenicity of all ten studied isolates for any of the pathometric criteria. There were morphological differences between isolates from Argentina and Brazil but not in pathogenicity. This confirms that the isolates used in this study belong to the species Et.
publishDate 2014
dc.date.none.fl_str_mv 2014-12-19
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info:eu-repo/semantics/acceptedVersion
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info:ar-repo/semantics/articulo
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status_str acceptedVersion
dc.identifier.none.fl_str_mv http://pa.bibdigital.ucc.edu.ar/2258/1/A_DeRossi_Brsutolin_Reis.pdf
url http://pa.bibdigital.ucc.edu.ar/2258/1/A_DeRossi_Brsutolin_Reis.pdf
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language por
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http://www.summanet.com.br/summanet-site/site/revista.php
info:eu-repo/semantics/altIdentifier/doi/10.1590/0100-5405/1948
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dc.publisher.none.fl_str_mv Asociaci�n de Fitopatolog�a del Estado de S�o Paulo (APF)
publisher.none.fl_str_mv Asociaci�n de Fitopatolog�a del Estado de S�o Paulo (APF)
dc.source.none.fl_str_mv De Rossi, Roberto Luis ORCID: https://orcid.org/0000-0003-0130-5415 <https://orcid.org/0000-0003-0130-5415>, Reis, Erlei Melo and Brustolin, Ricardo (2014) Morfologia de conídios e patogenicidade de isolados de Exserohilum turcicum da Argentina e do Brasil em milho. Summa Phytopathologica, 41 (1). pp. 58-63. ISSN 0100-5405
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reponame_str Producción Académica (UCC)
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instname_str Universidad Católica de Córdoba
repository.name.fl_str_mv Producción Académica (UCC) - Universidad Católica de Córdoba
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