Influence of cultivated landscape composition on variety resistance: an assessment based on wheat leaf rust epidemics
Article first published online: 17 MAY 2011
© 2011 The Authors. New Phytologist © 2011 New Phytologist Trust
Volume 191, Issue 4, pages 1095–1107, September 2011
How to Cite
Papaïx, J., Goyeau, H., Du Cheyron, P., Monod, H. and Lannou, C. (2011), Influence of cultivated landscape composition on variety resistance: an assessment based on wheat leaf rust epidemics. New Phytologist, 191: 1095–1107. doi: 10.1111/j.1469-8137.2011.03764.x
- Issue published online: 11 AUG 2011
- Article first published online: 17 MAY 2011
- Received: 8 February 2011, Accepted: 5 April 2011
- Bayesian modelling;
- crop resistance durability;
- hierarchical model;
- landscape epidemiology;
- population genetics;
- Puccinia triticina;
- wheat leaf rust
- •In plant pathology, the idea of designing variety management strategies at the scale of cultivated landscapes is gaining more and more attention. This requires the identification of effects that take place at large scales on host and pathogen populations. Here, we show how the landscape varietal composition influences the resistance level (as measured in the field) of the most grown wheat varieties by altering the structure of the pathogen populations.
- •For this purpose, we jointly analysed three large datasets describing the wheat leaf rust pathosystem (Puccinia triticina/Triticum aestivum) at the country scale of France with a Bayesian hierarchical model.
- •We showed that among all compatible pathotypes, some were preferentially associated with a variety, that the pathotype frequencies on a variety were affected by the landscape varietal composition, and that the observed resistance level of a variety was linked to the frequency of the most aggressive pathotypes among all compatible pathotypes.
- •This data exploration establishes a link between the observed resistance level of a variety and landscape composition at the national scale. It illustrates that the quantitative aspects of the host–pathogen relationship have to be considered in addition to the major resistance/virulence factors in landscape epidemiology approaches.