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BY-NC-ND 3.0 license Open Access Published by De Gruyter June 2, 2014

Phytotoxic Components Produced by Pathogenic Fusarium against Morning Glory

Bun-ichi Shimizu, Fukuko Saito, Hisashi Miyagawa, Ken Watanabe, Tamio Ueno, Kanzo Sakata and Kei Ogawa

A pathogenic isolate of Fusarium, F. oxysporum f. sp. batatas O-17 (PF), causes wilt disease in leaf etiolation in sweet potato (Ipomoea batatas) and morning glory (Ipomoea tricolor). Extracts from PF cultures were screened for phytotoxic components using a growth inhibition assay with morning glory seedlings. The extracts were fractionated using differential solvent extraction and two active compounds, ergosterol and fusalanipyrone, were isolated from the less-polar fraction. Growth inhibition of morning glory seedlings showed a sigmoidal doseresponse relationship, with fusalanipyrone exhibiting a two order of magnitude higher EC50 value than ergosterol (18 nᴍ and 1.6 μᴍ, respectively). Both compounds showed lower growth inhibition activity towards lettuce seedlings (Lactuca sativa). This study provides information on the phytotoxic components of PF and discusses the mechanism behind PFfinduced phytotoxicity.

Received: 2005-4-29
Published Online: 2014-6-2
Published in Print: 2005-12-1

© 1946 – 2014: Verlag der Zeitschrift für Naturforschung

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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