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Stabilizing selection in crop pathosystems: an empty concept or a reality?

By: Parlevliet, J.E.
Material type: materialTypeLabelArticlePublisher: 1981Subject(s): Plant genetics and breeding | Protection of plants and stored productsDDC classification: 82-754770 In: Euphytica (Netherlands). (Jun 1981). v. 30(2) p. 259-269Summary: Van der Plank assumed that vertical resistance (VR) in the host population and stabilizing selection (SS) in the pathogen population are indissolubly connected. This appears to be based on an unjustified premise. The various approaches used to evaluate the possible operation of SS and their results are discussed. Clear evidence of the existence of SS, no redundant virulence genes, was not found. On the contrary, several crop pathosystems exist with several to many unnecessary virulence genes. Therefore, it is concluded that: (1) SS as a general phenomenon does not exist in crop pathosystems; it is an empty concept. (2) It is not to be ruled out that SS operates in some crop pathosystems with respect to some VR-genes. (3) The complete adaptation of the pathogen population to a newly introduced VR gene is thought of as a two-stage process consisting of the acquisition of the matching virulence gene followed by a recovery in general fitness. In many studies SS was thought to operate because the fitness of a race was measured before this second stage had been completed. (4) Contrary to crop pathosystems SS is assumed to operate in wild plant-biotrophic pathogen systemsCollection: AGRIS Collection
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Article CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

AGRIS Collection 82-754770 (Browse shelf) Available
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32 ref.; Summary (En)

Van der Plank assumed that vertical resistance (VR) in the host population and stabilizing selection (SS) in the pathogen population are indissolubly connected. This appears to be based on an unjustified premise. The various approaches used to evaluate the possible operation of SS and their results are discussed. Clear evidence of the existence of SS, no redundant virulence genes, was not found. On the contrary, several crop pathosystems exist with several to many unnecessary virulence genes. Therefore, it is concluded that: (1) SS as a general phenomenon does not exist in crop pathosystems; it is an empty concept. (2) It is not to be ruled out that SS operates in some crop pathosystems with respect to some VR-genes. (3) The complete adaptation of the pathogen population to a newly introduced VR gene is thought of as a two-stage process consisting of the acquisition of the matching virulence gene followed by a recovery in general fitness. In many studies SS was thought to operate because the fitness of a race was measured before this second stage had been completed. (4) Contrary to crop pathosystems SS is assumed to operate in wild plant-biotrophic pathogen systems

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