In this study, we looked for evidence of directional or stabilizing/disruptive selection on plant
size and on the level of damage (resistance) caused by four types of herbivores in the
annual morning glory Ipomoea purpurea. Selection was estimated by standard phenotypic
regression analysis and by regression on breeding values. The phenotypic regression
analysis revealed directional selection for all five characters (ie, plant size and resistance to
four types of herbivores) and indicated that plant size and resistance to corn‐earworm …

The evolution of resistance to herbivory in Ipomoea purpurea. I. Attempts to detect selection
| Health & Environmental Research Online (HERO) | US EPA … Ipomoea purpurea; genetic
variation; Helicoverpa zea; regression analysis; evolution; genetic drift; phenotypic selection;
resistance to injurious factors …