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Effects of Fusarium solani isolates and metabolites on Striga germination

Published online by Cambridge University Press:  20 January 2017

Nafisa E. Ahmed ,
Yukihiro Sugimoto ,
Abdel Gabar T. Babiker ,
Omayma E. Mohamed ,
Yongqing Ma ,
Shinobu Inanaga  and
Hiromitsu Nakajima
Nafisa E. Ahmed
Affiliation:
Agricultural Research Corporation, P.O. Box 126, Wad Medani, Sudan
Abdel Gabar T. Babiker
Affiliation:
Agricultural Research Corporation, P.O. Box 126, Wad Medani, Sudan
Omayma E. Mohamed
Affiliation:
Agricultural Research Corporation, P.O. Box 126, Wad Medani, Sudan
Yongqing Ma
Affiliation:
Arid Land Research Center, Tottori University, Hamasaka 1390, Tottori 680-0001, Japan
Shinobu Inanaga
Affiliation:
Arid Land Research Center, Tottori University, Hamasaka 1390, Tottori 680-0001, Japan
Hiromitsu Nakajima
Affiliation:
Faculty of Agriculture, Tottori University, Koyama, Tottori 680-8550, Japan
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Abstract

An isolate of Fusarium solani (Sud 96) obtained from infected Striga plants in Sudan and six other isolates from Japan were evaluated for their effects on Striga germination. Among all the isolates, only the one from Sudan demonstrated high inhibitory activity. Aqueous and organic solvent culture extracts, as well as fungus suspension, when mixed with GR24, a synthetic analog of the natural germination stimulant strigol, inhibited germination of conditioned Striga seeds. Fusarium solani (Sud 96) filtrates, from cultures grown on autoclaved rice, sorghum grains, and potato dextrose agar (PDA), were more effective in reducing Striga germination than those from cultures grown on wheat straw. A significant difference between rice compared to sorghum and PDA cultures only occurred at high dilutions (40-fold). Complete inhibition of germination occurred when F. solani (Sud 96) culture filtrates and GR24 were applied simultaneously. Filtrate treatments made 2, 4 and 6 h subsequent to treatment with GR24 were less inhibitory. Filtrate treatments applied 8 h or more following GR24 had negligible effects on germination. Chromatographic separation on a silica gel column indicated the presence of several compounds with high inhibitory activity.

Keywords

Fusarium solani (Mart.) Sacc.rice, Oryza sativa L.sorghum, Sorghum bicolor (L.) Moenchwheat, Triticum aestivum L.witchweed, Striga hermonthica (Del.) BenthBiological controlgerminationinhibitionparasitic weed.
Type
Research Article
Information
Weed Science , Volume 49 , Issue 3 , June 2001 , pp. 354 - 358
Copyright
Copyright © Weed Science Society of America 

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