Flower color variation in the morning glory, Ipomoea purpurea

Abstract

In the southeastern United States populations of the annual, self compatible vine, Ipomoea purpurea, are strikingly polymorphic for flower color. Eight color phenotypes are commonly found. Flower color variation can be accounted for by segregation at three loci: P/p determines plgment hue, W/ w pigment distribution, and i/ipigment intensity. The Inheritance of a mottled phenotype and of esterase variation also are reported. There is no evidence for linkage between loci P and W, P and I, or P and esterase. Variation in flower color has been shown to influence pollinator behavior and maternal outcrossing rates. It is suggested that these highly polymorphic populations provide an ideal opportunity for studying evolution of the mating system.