From: Weeds, as ancillary hosts, pose disproportionate risk for virulent pathogen transfer to crops
 | Barley | Barley grass | ||||
---|---|---|---|---|---|---|
 | Large pathogen pop size | Genetically uniform host |  | Small pathogen population size | Genetically diverse host |  |
R. commune diversity | Predicted | Predicted | Observed | Predicted | Predicted | Observed |
Neutral genetic diversity: | Â | Â | Â | Â | Â | Â |
 No. of SSR alleles | Many | Few | Many | Few | Many | Few |
  Ne | Large | Small | Large | Small | Large | Small |
 No. of MLGs | Many | Few | Many | Few | Many | Few |
 Mode of reproduction/linkage disequilibrium | - | More asexual/high linkage disequilibrium | More sexual/lower linkage disequilibrium | - | More sexual/low linkage disequilibrium | More asexual/higher linkage disequilibrium |
 Migration | More from barley to barley grass | More from barley grass to barley | More from barley grass to barley | More from barley to barley grass | More from barley grass to barley | More from barley grass to barley |
Diversity under selection: | Â | Â | Â | Â | Â | Â |
 No. of effector alleles | - | Few | Few | - | Many | Many |
 No. of pathotypes | - | Few | Few | - | Many | Many |
 Aggressiveness | - | Less | Less | - | More | More |