Present address: CNRS, UMR8079 Ecologie Systématique Evolution, Université Paris Sud, Bâtiment 360, F-91405 Orsay, France.
Evolution of the population structure of Venturia inaequalis, the apple scab fungus, associated with the domestication of its host
Article first published online: 18 JAN 2010
© 2010 Blackwell Publishing Ltd
Volume 19, Issue 4, pages 658–674, February 2010
How to Cite
GLADIEUX, P., ZHANG, X.-G., RÓLDAN-RUIZ, I., CAFFIER, V., LEROY, T., DEVAUX, M., VAN GLABEKE, S., COART, E. and LE CAM, B. (2010), Evolution of the population structure of Venturia inaequalis, the apple scab fungus, associated with the domestication of its host. Molecular Ecology, 19: 658–674. doi: 10.1111/j.1365-294X.2009.04498.x
- Issue published online: 25 JAN 2010
- Article first published online: 18 JAN 2010
- Received 25 May 2009; revision received 12 November 2009; accepted 21 November 2009
- disease emergence;
- wild apples
Evaluating the impact of plant domestication on the population structure of the associated pathogens provides an opportunity to increase our understanding of how and why diseases emerge. Here, we investigated the evolution of the population structure of the apple scab fungus Venturia inaequalis in response to the domestication of its host. Inferences were drawn from multilocus microsatellite data obtained from samples collected on (i) the Central Asian Malus sieversii, the main progenitor of apple, (ii) the European crabapple, Malus sylvestris, a secondary progenitor of apple, and (iii) the cultivated apple, Malus×domestica, in orchards from Europe and Central Asia. Using clustering methods, we identified three distinct populations: (i) a large European population on domesticated and wild apples, (ii) a large Central Asian population on domesticated and wild apples in urban and agricultural areas, and (iii) a more geographically restricted population in M. sieversii forests growing in the eastern mountains of Kazakhstan. Unique allele richness and divergence time estimates supported a host-tracking co-evolutionary scenario in which this latter population represents a relict of the ancestral populations from which current populations found in human-managed habitats were derived. Our analyses indicated that the domestication of apple induced a significant change in the genetic differentiation of populations of V. inaequalis in its centre of origin, but had little impact on its population dynamics and mating system. We discuss how the structure of the apple-based agrosystem may have restricted changes in the population structure of the fungus in response to the domestication of its host.