Factors affecting the occurrence and spread of variants in population of plant pathogenic fungi

Chin K.M., . Factors affecting the occurrence and spread of variants in population of plant pathogenic fungi. pp. 123-132. ISSN 0127-6883

Genetic changes in pathogen populations which increase levels of pathogenicity against host resistance or reduce levels of sensitivity of fungicides are important because they may render the corresponding control measure ineffective. A simple unified model has shown that the direction and degree of selection on these populations depend largely on the extent or frequency of the selecting medium its duration the initial frequency of the adapted pathotype and its mean fitness relative to that of non-adapted pathotypes on the non-selecting medium. The paper discusses why host resistance and fungicides may generally be treated in common as selective media with similar implications for pathogen evolution although subtle differences exist e.g. background modifier genes in host resistance have no parallel in fungicide treatment. The integration of host resistance with fungicide treatment offers both the tactical advantage of superior disease control and the strategic advantage of reduced selection for adaption to either control measure. Recent studies with Pyricularia oryzae are cited as examples.

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Abstract

Genetic changes in pathogen populations which increase levels of pathogenicity against host resistance or reduce levels of sensitivity of fungicides are important because they may render the corresponding control measure ineffective. A simple unified model has shown that the direction and degree of selection on these populations depend largely on the extent or frequency of the selecting medium its duration the initial frequency of the adapted pathotype and its mean fitness relative to that of non-adapted pathotypes on the non-selecting medium. The paper discusses why host resistance and fungicides may generally be treated in common as selective media with similar implications for pathogen evolution although subtle differences exist e.g. background modifier genes in host resistance have no parallel in fungicide treatment. The integration of host resistance with fungicide treatment offers both the tactical advantage of superior disease control and the strategic advantage of reduced selection for adaption to either control measure. Recent studies with Pyricularia oryzae are cited as examples.

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Item Type:	Article
Additional Information:	2 tables; 25 ref. Summary (En)
AGROVOC Term:	PYRICULARIA ORYZAE
AGROVOC Term:	FUNGICIDAS
AGROVOC Term:	MODELOS/ PODER PATOGENO
AGROVOC Term:	VARIACION GENETICA
AGROVOC Term:	RESISTENCIA A LA ENFERMEDAD
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:56
URI:	http://webagris.upm.edu.my/id/eprint/20247

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