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Biochemical and morphological evidence for host race evolution in desert mistletoe,Phoradendron californicum (Viscaceae)
Authors:Jeffrey T Glazner  B Devlin  Norman C Ellstrand
Institution:(1) Department of Botany & Plant Sciences, University of California, 92521-0124 Riverside, CA, USA
Abstract:Allozymes and morphological characters were used to test whether host race evolution—the genetic divergence of parasitic populations caused by adaptation to different host species—has occurred in desert mistletoe,Phoradendron californicum. Populations ofPhoradendron californicum from two hosts,Acacia greggii andProsopis glandulosa, were surveyed from the Mojave and Colorado deserts. Electrophoretic data indicated genetic differentiation of mistletoes occurring on these hosts. Three of four morphological characters (internode length, main shoot lateral shoot diameter ratio and berry color) also showed significant host-specific differentiation. These data support the hypothesis that host race formation has occurred or is occurring in this parasitic angiosperm.
Keywords:Angiosperms  Fabales  Viscaceae  Phoradendron californicum  Acacia greggii  Prosopis glandulosa  Electrophoresis  allozymes  isozymes  host race evolution
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