Figure 5.
Conditional inference regression tree modelling RB with three explanatory variables. RB is the frequency of breakdown of pvr23‐mediated resistance in 84 pepper doubled‐haploid (DH) lines. Three explanatory variables representing evolutionary forces exerted by the host plant on Potato virus Y (PVY) populations were retained by the analysis: VA (within‐plant virus accumulation), N e inoc (effective population size at the plant inoculation step) and σ r (differential selection exerted by the host plant on the composite PVY population). Given the parameters of the analysis (minimum number of 10 DH lines in each terminal ‘leaf’ of the tree and default setting for other parameters), the fourth explanatory variable (N e, effective population size during plant colonization) was not found to determine significantly RB. The number of DH lines in each category is indicated in parentheses. P: P value indicating the significance of the variable.