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

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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.