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United States Department of Agriculture

Agricultural Research Service

Title: Discovery and Possible Significance of Nectriafurone, 5-O-Methyjavanicin and Related Compounds by Fusarium Oxysporum F. Sp. Vasinfectum

Authors
item Wheeler, Michael
item Puckhaber, Lorraine - TEXAS A&M UNIVERSITY
item Bell, Alois
item Baker, R. -
item Stipanovic, Robert

Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract Only
Publication Acceptance Date: January 10, 2000
Publication Date: N/A

Technical Abstract: Nectriafurone, 5-O-methyljavanicin, and other compounds believed to be polyketides naphthazarin quinones were isolated from cultures of pathogenic strains of Fusarium oxysporum f. sp. vasinfectum (F.o.v.), the causative agent of Fusarium wilt. These compounds often were not found in cultures of avirulent Fusarium oxysporum isolates obtained from cotton, suggesting they may play a role in pathogenicity. Nectriafurone was not appreciably phytotoxic to turnip or radish seedlings grown in water under shake conditions; however, 5-O-methyljavanicin and a few of the unknown compounds were phytotoxic to varying degrees. We also are interested in these compounds because a number of naphthazarin compounds related to nectriafurone are produced by isolates of Fuarium solani and F. oxysporum obtained from diseased citrus trees. The involvement of naphthazarins as a cause of blight in citrus has been suggested, and they have been shown to cause wilt, vessel plugging, and root rot in citrus seedlings, symptoms common to blight. For this reason it appears possible that naphthazarins also may play a role in Fusarium wilt of cotton.

Last Modified: 4/18/2014