Peroxidase Allozyme Differentiation among Successional Stands of Ponderosa Pine

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Abstract
Genetic variation of a peroxidase locus from mature ponderosa pine P. ponderosa var. scopulorum needles was surveyed among 4 successional stands on the Shanahan Mesa near Boulder, Colorado [USA]. The recent colonization of this mesa by ponderosa pine can be documented by historical reports and tree cores. Allozyme differentiation was observed on the Shanahan Mesa between 2 recently colonized, open-grown stands and a shaded secondary growth stand, which parallels patterns of differentiation found in nearby mountain populations. At a transitional stand in the middle of the mesa, genetic differences also occurred between older open-grown trees and shaded younger trees. Environmental effects from canopy closure appear to have affected peroxidase differentiation among these successional stands.