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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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Evolution; international journal of organic evolution·2017

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THE DISTRIBUTION AND ORIGIN OF GENES FOR RACE-SPECIFIC RESISTANCE TO MELAMPSORA LINI IN LINUM MARGINALE.

¹Division of Plant Industry, CSIRO, G. P. O. Box 1600, Canberra City, A. C. T. 2601, Australia.

Evolution; International Journal of Organic Evolution

|June 2, 2017

Summary

Wild flax (Linum marginale) resistance to flax rust (Melampsora lini) is controlled by dominant genes. Linkage between these resistance genes suggests a mechanism for their generation in natural populations.

Keywords:

Gene-for-gene coevolution Linum marginale Melampsora lini linkage origins of resistance race-specific resistance genes

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Area of Science:

Plant pathology
Evolutionary genetics
Botany

Background:

Wild flax (Linum marginale) is a host for the flax rust pathogen (Melampsora lini).
Understanding plant-pathogen interactions is crucial for disease resistance research.
Genetic diversity in wild plant populations can influence disease dynamics.

Purpose of the Study:

To investigate the genetic basis of resistance in wild flax to Melampsora lini.
To analyze the genetic structure of resistance genes within different geographic populations of Linum marginale.
To explore potential mechanisms for the generation of resistance genes in natural plant populations.

Main Methods:

Phenotypic assessment of resistance and susceptibility across multiple lines of Linum marginale.
Genetic analysis using intercrosses to identify dominant genes controlling race-specific resistance.
Quantification of gene linkage within local (Kiandra) and broader geographic populations.

Main Results:

All investigated lines of Linum marginale exhibited varied patterns of resistance and susceptibility.
Single dominant genes conferred race-specific resistance in most lines; one line had two linked dominant genes.
Significantly higher linkage was observed between resistance genes in the local Kiandra population compared to the broader collection.

Conclusions:

Dominant genes control race-specific resistance in wild flax against Melampsora lini.
The observed gene linkage patterns suggest a mechanism for the generation and maintenance of resistance genes in natural populations.
This study provides insights into the evolutionary dynamics of plant-pathogen interactions in wild flax.