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Trichothecene inhibitors of Striga hermonthica germination produced by Fusarium solani

Published online by Cambridge University Press:  20 January 2017

Nafisa E. Ahmed
Affiliation:
Agricultural Research Corporation, P.O. Box 126, Wad Medani, Sudan
Norifumi Yasuda
Affiliation:
Arid Land Research Center, Tottori University, 1390 Hamasaka, Tottori 680-0001, Japan
Shinobu Inanaga
Affiliation:
Arid Land Research Center, Tottori University, 1390 Hamasaka, Tottori 680-0001, Japan
Corresponding

Abstract

Metabolites of the fungus Fusarium solani (Sud 96) inhibited Striga hermonthica germination induced by the germination stimulant GR24. The active principles were identified as trichothecenes acuminatin, neosolaniol, 8-acetylneosolaniol, and tetraacetoxy T-2 tetraol (neosolaniol diacetate) on the basis of their chromatographic behavior and nuclear magnetic resonance and mass spectra. Inhibitory activity of the four trichothecenes against Striga germination increased with acetylation of the hydroxyl moieties. The most abundant inhibitor produced by the fungus, 8-acetylneosolaniol, completely inhibited Striga germination at 24 μM. The fungal toxin did not affect the germination of sorghum, a host crop, but retarded root and shoot elongation of the seedlings by 60 and 30%, respectively, at the same concentration.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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