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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/5119

Title: Nota Científica - Identification of Tapesia yallundae Wallwork & Spooner,teleomorph of Pseudocercosporella herpotrichoides (Fron.) Deighton var. herpotrichoides , the causal agent of eyespot of wheat in southern Chile
Authors: O. Andrade
Keywords: eyespot, wheat diseases, Tapesia yallundae, Pseudocercosporella herpotrichoides, Triticum aestivum L..
mancha ocular, enfermedad de trigo, Tapesia yallundae, Pseudocercosporella herpotrichoides, Triticum aestivum L.
Issue Date: 31-Dec-2005
Publisher: Instituto de Investigaciones Agropecuarias, INIA
Citation: Agricultura Técnica (ISSN: 0365-2807) Vol 65 Num 3
Abstract: From wheat (Triticum aestivum L.) culms collected at the end of January, 1995 from farmland affected by a severe outbreak of eyespot, located in southern Chile (38°14' S, 72°38' W), the presence of small, 0.2 to 0.5 mm of diameter, black apothecia at the base of the culms were observed with a stereo microscope. On analyzing these structures, cylindric to fusoid asci, of 35 to 38 μm x 5.9 to 7.4 μm were also observed. After 24 h in a humidity chamber, the apothecia discharged hyaline, fusoid, 0-1 septate, rounded end ascospores, with an average size of 8.9 (7.4 to 10.3) x 2.07 μm (1.95 to 2.34). Monoascosporic cultures effected in a water-agar (WA) + rifampicin medium, originated after 30-35 days colonies with the development of conidia characteristic of Pseudocercosporella herpotrichoides var.herpotrichoides. The pathogenicity tests carried out on 12-day old wheat seedlings, with colonies developed from monoascosporic cultures, resulted in the development of characteristic symptoms of eyespot at the end of 30 days. The morphology of the apothecia, the asci, and the ascospores, as well as the development of characteristic conidia of P. herpotrichoides obtained from monoascosporic cultures, and the pathogenicity test carried out on wheat seedlings, demonstrated the presence of Tapesia yallundae Wallwork & Spooner, the teleomorphic state of P. herpotrichoides (Fron.) Deighton var. herpotrichoides, in southern Chile. This is the first identification of P. herpotrichoides var. herpotrichoides in Chile, and in the American continent.
URI: http://hdl.handle.net/1807/5119
Other Identifiers: http://www.bioline.org.br/abstract?id=at05033
Rights: Copyright 2005 - Instituto de Investigaciones Agropecuarias, INIA (Chile)
Appears in Collections:Bioline International Legacy Collection

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