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Phytotoxins produced by the oak pathogen Discula quercina

Maddau, Lucia and Perrone, C. and Andolfi, Anna and Spanu, Emanuela and Linaldeddu, Benedetto Teodoro and Evidente, Antonio (2011) Phytotoxins produced by the oak pathogen Discula quercina. Forest Pathology, Vol. 41 (2), p. 85-89. ISSN 1437-4781. eISSN 1439-0329. Article.

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DOI: 10.1111/j.1439-0329.2009.00633.x


Two phytotoxic metabolites, p-hydroxybenzaldehyde and indol-3-aldehyde, were isolated and identified by spectroscopic methods from solid cultures of Discula quercina, an endophytic fungal pathogen frequently associated with oak decline in Italy. In addition, the fungus produced an unusual acyclic keto acid as a major metabolite, which was identified by spectroscopic and chemical methods as 5-oxo-6E,8E-octadecadienoic acid. In leaf puncture assays on Quercus suber and Q. ilex leaves, indol-3-aldehyde proved to be more toxic than p-hydroxybenzaldehyde, while 5-oxo-6E,8E-octadecadienoic acid was inactive even at the highest concentration used (1 mg ml−1). Although indol-3-aldehyde is a known microbial metabolite, its phytotoxic activity has hitherto not been reported. This report is the first to describe the production of phytotoxic compounds by D. quercina.

Item Type:Article
ID Code:6201
Uncontrolled Keywords:Discula quercina, fungal pathogen, "oak anthracnose"
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/12 Patologia vegetale
Divisions:001 Università di Sassari > 01 Dipartimenti > Protezione delle piante
Publisher:Blackwell / Wiley
Copyright Holders:© 2009 Blackwell Verlag GmbH
Deposited On:04 Jul 2011 10:20

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