THE EVOLUTIONARY BIOLOGY OF FUSARIUM OXYSPORUM

Author:

Gordon T. R.1,Martyn R. D.2

Affiliation:

1. Department of Plant Pathology, University of California, Davis, California 95616;

2. Department of Plant Pathology and Microbiology, Texas A&M University, College Station, Texas 77843;

Abstract

▪ Abstract  Fusarium oxysporum is an anamorphic species that includes both pathogenic and nonpathogenic strains. Plant pathogenic forms cause a wilt disease and are grouped into formae speciales based on their host range; some are further subdivided into pathogenic races. Many formae speciales are comprised of multiple clonal lineages and, in some cases, a pathogenic race is associated with more than one clonal lineage, suggesting independent origins. Although some evidence suggests one pathogenic race may give rise to another, recent derivation of a pathogen from a nonpathogen has not been documented. Most new occurrences of Fusarium wilt appear to be the result of a recent introduction rather than an independent local origin of the pathotype. Asexual propagation is the dominant influence on population structure in F. oxysporum and the absence of sexual reproduction is not likely to prevent this pathogen from continuing to inflict significant damage on susceptible crop hosts.

Publisher

Annual Reviews

Subject

Plant Science

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