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Related Concept Videos

Frequency-dependent Selection01:21

Frequency-dependent Selection

23.1K
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Gene Flow02:39

Gene Flow

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Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
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Inheritance of Pathogenicity in <i>Melampsora lini</i>.

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Relation of Antigens of Melampsora lini and Linum usitatissimum to Resistance and Susceptibility.

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Mutations in Flax Rust Induced by Ultraviolet Radiation.

Science (New York, N.Y.)·1956
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Environmentally Induced Heritable Changes in Flax
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Host-Parasite Interaction in Flax Rust-Its Genetics and Other Implications.

H H Flor

    Phytopathology
    |September 11, 2025
    PubMed
    Summary

    Flax rust pathogenicity was studied using F2 cultures and differential flax varieties. A gene-for-gene relationship was confirmed, enabling a new method to identify rust genotypes and develop resistant flax varieties.

    Area of Science:

    • Plant pathology
    • Genetics
    • Agricultural science

    Background:

    • Understanding host-parasite interactions is crucial for managing crop diseases like flax rust.
    • The flax rust pathogen (*Melampsora lini*) exhibits complex pathogenicity.
    • Previous studies suggested genetic factors influence flax rust virulence and flax resistance.

    Purpose of the Study:

    • To determine the pathogenicity of F2 cultures from a flax rust cross.
    • To investigate the genetic basis of host-parasite interactions in flax rust.
    • To develop a method for identifying flax rust pathogen genotypes.

    Main Methods:

    • Assessed pathogenicity of 67 F2 flax rust cultures on 32 differential flax varieties with single rust-reaction genes.
    • Analyzed segregation ratios of avirulent to virulent cultures to infer genetic control of pathogenicity.

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  • Utilized pustule type as the criterion for host reaction and pathogen pathogenicity.

    • Main Results:

    • Identified 54 distinct pathogenic races from the 67 F2 cultures.
    • Confirmed a gene-for-gene relationship between flax resistance genes and flax rust avirulence/pathogenicity genes.
    • Observed approximate 3:1 ratios for avirulence on 23 out of 24 segregating flax varieties, suggesting recessive gene control.

    Conclusions:

    • The gene-for-gene model accurately explains host-parasite interactions in flax rust.
    • A novel method was developed to identify the pathogenic genotype of flax rust races.
    • This research facilitates the development of rust-resistant flax varieties and advances studies on rust evolution and epidemiology.