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Reaction norms for (i) aphid population size, (ii) stem biomass and (iii) root biomass in two mapping populations; (a) Steptoe × Morex and (b) Oregon Wolfe Barley. The long dashed line represents parental lines (a) OWB-rec and (b) Morex; the short dashed line represents parental lines (a) OWB-dom and (b) Steptoe.
