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Quantification of Fungal Colonization, Sporogenesis, and Production of Mycotoxins Using Kernel Bioassays

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Published on: April 23, 2012

Spore Killer Polymorphism in FUSARIUM MONILIFORME.

S Kathariou¹, P T Spieth

¹Department of Genetics, University of California, Berkeley, California 94720.

|September 1, 1982

Summary

A Spore killer trait, analogous to that in Neurospora, is prevalent in Fusarium moniliforme populations. While killer alleles dominate, sensitive alleles are widespread globally.

Area of Science:

Mycology
Genetics
Plant Pathology

Background:

The Spore killer trait, a genetic phenomenon, has been previously studied in the model organism Neurospora.
Fusarium moniliforme is a significant fungal plant pathogen with global distribution.

Purpose of the Study:

To investigate the presence and genogeography of the Spore killer trait in natural populations of Fusarium moniliforme.
To compare the distribution patterns of killer and sensitive alleles in F. moniliforme with those observed in Neurospora species.

Main Methods:

Field surveys and laboratory analysis of Fusarium moniliforme isolates.
Genetic and cytological characterization of the Spore killer trait polymorphism.

Main Results:

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The Spore killer trait was identified in Fusarium moniliforme, exhibiting analogous genetic and cytological properties to Neurospora.
Over 80% of tested F. moniliforme isolates carried the killer allele, indicating high prevalence.
Sensitive alleles were found to be widely distributed across various geographic locations, including California, Italy, Greece, and Central America.

Conclusions:

The genogeography of Spore killer polymorphism in F. moniliforme is distinct from Neurospora intermedia but similar to N. sitophila, albeit with higher killer allele frequency.
Despite the high prevalence of killer alleles, sensitive alleles are maintained in natural populations, suggesting complex evolutionary dynamics.