Production of Acid Is Responsible For Antibiosis by Some Ectomycorrhizal Fungi

Rasanayagam, S. and Jeffries, P. (1992) Production of Acid Is Responsible For Antibiosis by Some Ectomycorrhizal Fungi. Mycological Research, 96 . pp. 971-976. ISSN 0953-7562. (The full text of this publication is not available from this repository)

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Abstract

The interaction of Pythium ultimum with a variety of ectomycorrhizal fungi was investigated in vitro. Out of 19 isolates of ectomycorrhizal fungi tested for inhibition of the growth of P. ultimum, 16 caused swelling and bursting of the tips of leading hyphae. These effects were eliminated by maintaining the culture medium at pH 6 with a biological buffer. This indicated that acidification of the medium was the cause of the inhibition. Hyphal growth of P. ultimum was inhibited below pH 3. In liquid culture, the ectomycorrhizal fungus Paxillus involutus reduced the pH of the medium to less than 3 before it reached stationary phase. It is suggested that the antibiotic effect exhibited by some ectomycorrhizal fungi is due to acid production. HPLC analyses of culture filtrates of Pax. involutus were shown not to contain significant amounts of oxalic acid, but other acids were present in large quantities.

Item Type: Article
Subjects: Q Science > QD Chemistry
R Medicine
Divisions: Faculties > Science Technology and Medical Studies > School of Biosciences
Depositing User: M. Nasiriavanaki
Date Deposited: 21 Aug 2009 10:21
Last Modified: 21 Aug 2009 10:21
Resource URI: http://kar.kent.ac.uk/id/eprint/22410 (The current URI for this page, for reference purposes)
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