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- W2081734892 abstract "Gene-for-gene relationships are a common feature of plant-parasite interactions. Polymorphism at host resistance and parasite avirulence loci is maintained if there is negative, direct frequency-dependent selection on alleles of either gene. More specifically, selection of this kind is generated when the disease is polycyclic with frequent auto-infection. When an incompatible interaction occurs between a resistant host and an avirulent parasite, systemic defenses are triggered, rendering the plant more resistant to a later attack by another parasite. However, induced resistance (IR) incurs a fitness cost to the plant. Here, the effect of IR on polymorphism in gene-for-gene interactions is investigated. First, in an infinite population model in which parasites have two generations per host generation, increasing the fitness cost of IR increases selection for susceptible plants at low disease severity, while increasing the effectiveness of IR against further parasite attacks enhances selection for resistant plants at high disease severity. This reduces the possibility of polymorphism being maintained in host and parasite populations. In finite population models, the number of plants varies over time as a function of the disease burden of the population. Polymorphism in gene-for-gene relationships is then more stable at high disease prevalence and severity if IR reactions are more costly when there is competition for resources between plants." @default.
- W2081734892 created "2016-06-24" @default.
- W2081734892 creator A5010131983 @default.
- W2081734892 creator A5080888302 @default.
- W2081734892 date "2008-01-01" @default.
- W2081734892 modified "2023-09-25" @default.
- W2081734892 title "The Relationship of Host-Mediated Induced Resistance to Polymorphism in Gene-for-Gene Relationships" @default.
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- W2081734892 doi "https://doi.org/10.1094/phyto-98-1-0128" @default.
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