Occurrence of the Japanese pear pathotype of Alternaria alternata in Japanese pear orchards in Italy

A strain of Alternaria alternata (Fr) Keissler was repeatedly isolated from black spot lesions on leaves of Japanese pear cultivar Nijisseiki trees grown near Ravenna, Italy. Inoculation tests revealed that the isolates were pathogenic only for the Japanese pear cultivars which are known to be susce...

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Bibliographic Details
Published in:	Phytopathologia mediterranea Vol. 31; no. 3; pp. 141 - 147
Main Authors:	Kohmoto, K, Otani, H. (Tottori Univ. (Japan). Faculty of Agriculture), Cavanni, P, Bugiani, R. (Regione Emilia Romagna, Bologna (Italy). Osservatorio per le Malattie delle Piante)
Format:	Journal Article
Language:	English
Published:	Bologna Unione Fitopatologica Mediterranea 01-12-1992 Mediterranean Phytopathological Union
Subjects:	Agronomy. Soil science and plant productions ALTERNARIA Alternaria alternata Biological and medical sciences Conidia Fundamental and applied biological sciences. Psychology Fungal plant pathogens Germination Infrared radiation ITALIA ITALIE Japanese culture Leaves Lesions Pathogens Phytopathology. Animal pests. Plant and forest protection PYRUS PYRIFOLIA Spore germination Toxins Variation, races, biotypes, parasitic specialization, genetics Italy Europe Plant pathogen Pathogenesis Rosaceae Pyrus Alternaria alternata Fungi Inoculation Orchard Geographic distribution Fruit crop Dicotyledones Pathotype Angiospermae Spermatophyta Fruit tree Fungi Imperfecti Thallophyta Cultivar
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Summary:	A strain of Alternaria alternata (Fr) Keissler was repeatedly isolated from black spot lesions on leaves of Japanese pear cultivar Nijisseiki trees grown near Ravenna, Italy. Inoculation tests revealed that the isolates were pathogenic only for the Japanese pear cultivars which are known to be susceptible to the Japanese pear pathotype of A. alternata. HPLC analysis indicated that the fungus produces a relatively large amount of the host-selective AK-toxin-1 during conidial germination. This is the first report of the occurrence in Italy of the Japanese pear pathotype of A. alternata Un ceppo di Alternaria alternata (Fr) Keissler e stato ripetutamente isolato da foglie con maculatura nera di peri giapponesi (Pyrus serotina Redh. var. culta Redh.) cv. Nijisseiki coltivati nei pressi di Ravenna (Italia). Con prove d'infezione artificiale e stato dimostrato che gli isolati erano patogeni solo per le cultivar di pero giapponese suscettibili al patotipo pero giapponese di A. alternata. L'analisi cromatografica (HPLC) ha permesso di accertare che nel corso della germinazione dei conidi il fungo produce una quantita relativamente elevata della tossina selettiva AK-1. Questa e la prima segnalazione della presenza del patotipo pero giapponese di A. alternata in Italia
Bibliography:	9360878 H20 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0031-9465 1593-2095