Morphological Variation in Epicuticular Wax of SO2-Sensitive and -Tolerant Eastern White Pine Clones

Abstract

Needle surfaces of SO2-tolerant and -sensitive clones of P. strobus were examined by scanning electron microscopy to determine if variability related to sensitivity class correlated with differences in epicuticular wax morphology. Epistomatal wax formed a continuous covering over the stomata of tolerant clones, but was split longitudinally over the stomata of sensitive clones.