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Figure 5 | BMC Evolutionary Biology

Figure 5

From: Allopolyploidy and the evolution of plant virus resistance

Figure 5

Model of changes in quantitative innate virus resistance from a moderately resistant progenitor exhibiting fixed heterozygosity for resistance genes (e.g. a neoallopolyploid). Random divergence of the allopolyploid progeny leads to several possible lineages containing different resistance or susceptibility phenotypes whose existence depends on drift and pathogen pressure. High pathogen pressure would select for the loss of susceptibility factors and maintenance and gain of resistance factors (trajectory 1, top row). Moderate or irregular pathogen pressure would maintain an equilibrium of resistance and susceptibility factors within the plant population (trajectory 2, middle row). Low pathogen pressure would remove the selective advantage of maintaining resistance factors, and could result in the loss of resistance factors and the maintenance of susceptibility factors (trajectory 3, bottom row).

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