Genetic variability among isolates of Fusarium oxysporum from sugar beet

Fusarium yellows, caused by the soil‐borne fungus Fusarium oxysporum f. sp. betae (Fob), can lead to significant yield losses in sugar beet. This fungus is variable in pathogenicity, morphology, host range and symptom production, and is not a well characterized pathogen on sugar beet. From 1998 to 2...

Full description

Saved in:
Bibliographic Details
Published in:Plant pathology 2011-06, Vol.60 (3), p.496-505
Main Authors: Hill, A. L., Reeves, P. A., Larson, R. L., Fenwick, A. L., Hanson, L. E., Panella, L.
Format: Article
Language:English
Subjects:
Beans
Beta vulgaris
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
Fusarium oxysporum
fusarium yellows
genetic diversity
Host range
Pathogenicity
Pathogens
Phytopathology. Animal pests. Plant and forest protection
Plant diseases
Spinacia oleracea
Yellows
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Fusarium yellows, caused by the soil‐borne fungus Fusarium oxysporum f. sp. betae (Fob), can lead to significant yield losses in sugar beet. This fungus is variable in pathogenicity, morphology, host range and symptom production, and is not a well characterized pathogen on sugar beet. From 1998 to 2003, 86 isolates of F. oxysporum and 20 other Fusarium species from sugar beet, along with four F. oxysporum isolates from dry bean and five from spinach, were obtained from diseased plants and characterized for pathogenicity to sugar beet. A group of sugar beet Fusarium isolates from different geographic areas (including nonpathogenic and pathogenic F. oxysporum, F. solani, F. proliferatum and F. avenaceum), F. oxysporum from dry bean and spinach, and Fusarium DNA from Europe were chosen for phylogenetic analysis. Sequence data from β‐ tubulin, EF1α and ITS DNA were used to examine whether Fusarium diversity is related to geographic origin and pathogenicity. Parsimony and Bayesian MCMC analyses of individual and combined datasets revealed no clades based on geographic origin and a single clade consisting exclusively of pathogens. The presence of FOB and nonpathogenic isolates in clades predominately made up of Fusarium species from sugar beet and other hosts indicates that F. oxysporum f. sp. betae is not monophyletic.
ISSN:0032-0862
1365-3059
DOI:10.1111/j.1365-3059.2010.02394.x