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Infection and mycotoxin production by Fusarium lactis, causal agent of internal fruit rot of sweet pepper Open Access


Other title
sweet pepper
internal fruit rot
Fusarium lactis
Type of item
Degree grantor
University of Alberta
Author or creator
Yang, Yalong
Supervisor and department
Strelkov, Stephen (Agricultural, Food and Nutritional Science)
Examining committee member and department
Currah, Randy (Biological Sciences)
Howard, Ron (Agricultural, Food and Nutritional Science)
Dosdall, Lloyd (Agricultural, Food and Nutritional Science)
Department of Agricultural, Food and Nutritional Science

Date accepted
Graduation date
Master of Science
Degree level
Internal fruit rot, caused by Fusarium lactis, is as an important disease of greenhouse sweet pepper. Fungal growth was studied microscopically during anthesis and fruit development. Hyphae were observed on the stigmatal surface one day after inoculation (DAI), and in the transmitting tissues of the style and inside the ovary at 5 and 6 DAI. Symptomless seeds from infected fruits yielded colonies of F. lactis when cultured axenically, and typical disease symptoms were observed when fruits were dissected at 45 DAI. Isolates of F. lactis and the related species F. proliferatum and F. verticillioides, which are also associated with internal fruit rot, produced the mycotoxins beauvericin, moniliformin and fumonisin B1 in various combinations, both in infected fruits and in vitro. These findings suggest that internal fruit rot is initiated through infection of the stigma and style during anthesis, and that mycotoxin contamination of infected fruit could pose a health concern.
License granted by Yalong Yang ( on 2009-09-09T15:45:01Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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File title: Yalong's Completed Thesis - Revised Submission VERSION - Sep 5 2009
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