Journal Article varietal mixtures Agroecology Research Support, Non-U.S. Gov't Septoria tritici blotch agronomic trait allelic richness arms race competitive hierarchy cooperation crop crop domestication diversity durum wheat genome-wide analysis greenbeards high-throughput root phenotyping kin recognition kin selection niche complementarity phenotypic space plant functional trait plant-plant interactions plants plant–plant interactions relative yield root projected area selfish genes social evolution tragedy of the commons