IDENTIFICACIÓN DE Pseudocercosporella herpotrichoides (Fron) Deighton, AGENTE CAUSAL DE LA MANCHA OCULAR DEL TRIGO EN LA ZONA SUR DE CHILE

Near the end of the 1994/95 season, in different localities of the IXth Region, Chile, a high incidence of lodged wheat (Triticum aestivum L.) fields were observed, with up to 70% of some fields having white spikes, rotten and broken stems at the base. The microscopic observation of affected tissue...

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Autor principal:	Andrade V.,Orlando
Lenguaje:	Spanish / Castilian
Publicado:	Instituto de Investigaciones Agropecuarias, INIA 2003
Materias:	eyespot wheat diseases Pseudocercosporella herpotrichoides Triticum aestivum L. mancha ocular enfermedad en trigo
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072003000400004
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spelling	oai:scielo:S0365-280720030004000042005-05-27IDENTIFICACIÓN DE Pseudocercosporella herpotrichoides (Fron) Deighton, AGENTE CAUSAL DE LA MANCHA OCULAR DEL TRIGO EN LA ZONA SUR DE CHILEAndrade V.,Orlando eyespot wheat diseases Pseudocercosporella herpotrichoides Triticum aestivum L. mancha ocular enfermedad en trigo Pseudocercosporella herpotrichoides Triticum aestivum L. Near the end of the 1994/95 season, in different localities of the IXth Region, Chile, a high incidence of lodged wheat (Triticum aestivum L.) fields were observed, with up to 70% of some fields having white spikes, rotten and broken stems at the base. The microscopic observation of affected tissue of wheat cvs. SNA 400 and Francia, collected near Traiguén (IX Region), as well as the isolates obtained in agar-water + streptomycin sulfate permitted the observation of slow-growing, green-grayish colonies with smooth borders and the presence of needle-like, straight or curved, hyaline conidia, with 4 to 6-septated spores, occasionally 7 septated spores, and with a length of 40.9-81.9 µ m and diameter of 1.6-2.3 µ m. Pathogenicity tests carried out with the isolated organism, by inoculating 12-day-old wheat seedlings of cv. Otto Baer grown in sterile soil, and inoculated at the base of the stem, resulted in the development of brown oval lesions at the inoculated point in contrast to the controls that did not develop symptoms. The examination of the internal sheaths of affected tissue, previously stained, revealed the development of "infection plaques" characteristic of Pseudocercosporella herpotrichoides as well as mucilage collars at the hyphae infection sites. The results permitted the identification of P. herpotrichoides (Fron.) Deighton, as the causal agent of wheat eyespot as being responsible for the symptoms. This is the first report of the presence of P. herpotrichoides affecting wheat in Chile.info:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAAgricultura Técnica v.63 n.4 20032003-10-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072003000400004es10.4067/S0365-28072003000400004
institution	Scielo Chile
collection	Scielo Chile
language	Spanish / Castilian
topic	eyespot wheat diseases Pseudocercosporella herpotrichoides Triticum aestivum L. mancha ocular enfermedad en trigo Pseudocercosporella herpotrichoides Triticum aestivum L.
spellingShingle	eyespot wheat diseases Pseudocercosporella herpotrichoides Triticum aestivum L. mancha ocular enfermedad en trigo Pseudocercosporella herpotrichoides Triticum aestivum L. Andrade V.,Orlando IDENTIFICACIÓN DE Pseudocercosporella herpotrichoides (Fron) Deighton, AGENTE CAUSAL DE LA MANCHA OCULAR DEL TRIGO EN LA ZONA SUR DE CHILE
description	Near the end of the 1994/95 season, in different localities of the IXth Region, Chile, a high incidence of lodged wheat (Triticum aestivum L.) fields were observed, with up to 70% of some fields having white spikes, rotten and broken stems at the base. The microscopic observation of affected tissue of wheat cvs. SNA 400 and Francia, collected near Traiguén (IX Region), as well as the isolates obtained in agar-water + streptomycin sulfate permitted the observation of slow-growing, green-grayish colonies with smooth borders and the presence of needle-like, straight or curved, hyaline conidia, with 4 to 6-septated spores, occasionally 7 septated spores, and with a length of 40.9-81.9 µ m and diameter of 1.6-2.3 µ m. Pathogenicity tests carried out with the isolated organism, by inoculating 12-day-old wheat seedlings of cv. Otto Baer grown in sterile soil, and inoculated at the base of the stem, resulted in the development of brown oval lesions at the inoculated point in contrast to the controls that did not develop symptoms. The examination of the internal sheaths of affected tissue, previously stained, revealed the development of "infection plaques" characteristic of Pseudocercosporella herpotrichoides as well as mucilage collars at the hyphae infection sites. The results permitted the identification of P. herpotrichoides (Fron.) Deighton, as the causal agent of wheat eyespot as being responsible for the symptoms. This is the first report of the presence of P. herpotrichoides affecting wheat in Chile.
author	Andrade V.,Orlando
author_facet	Andrade V.,Orlando
author_sort	Andrade V.,Orlando
title	IDENTIFICACIÓN DE Pseudocercosporella herpotrichoides (Fron) Deighton, AGENTE CAUSAL DE LA MANCHA OCULAR DEL TRIGO EN LA ZONA SUR DE CHILE
title_short	IDENTIFICACIÓN DE Pseudocercosporella herpotrichoides (Fron) Deighton, AGENTE CAUSAL DE LA MANCHA OCULAR DEL TRIGO EN LA ZONA SUR DE CHILE
title_full	IDENTIFICACIÓN DE Pseudocercosporella herpotrichoides (Fron) Deighton, AGENTE CAUSAL DE LA MANCHA OCULAR DEL TRIGO EN LA ZONA SUR DE CHILE
title_fullStr	IDENTIFICACIÓN DE Pseudocercosporella herpotrichoides (Fron) Deighton, AGENTE CAUSAL DE LA MANCHA OCULAR DEL TRIGO EN LA ZONA SUR DE CHILE
title_full_unstemmed	IDENTIFICACIÓN DE Pseudocercosporella herpotrichoides (Fron) Deighton, AGENTE CAUSAL DE LA MANCHA OCULAR DEL TRIGO EN LA ZONA SUR DE CHILE
title_sort	identificación de pseudocercosporella herpotrichoides (fron) deighton, agente causal de la mancha ocular del trigo en la zona sur de chile
publisher	Instituto de Investigaciones Agropecuarias, INIA
publishDate	2003
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072003000400004
work_keys_str_mv	AT andradevorlando identificaciondepseudocercosporellaherpotrichoidesfrondeightonagentecausaldelamanchaoculardeltrigoenlazonasurdechile
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IDENTIFICACIÓN DE Pseudocercosporella herpotrichoides (Fron) Deighton, AGENTE CAUSAL DE LA MANCHA OCULAR DEL TRIGO EN LA ZONA SUR DE CHILE

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