Penetration of blue nad UV radiation measured by fiber optics in spruce and fir needles

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Abstract
The penetration of blue light (460 nm) and UV‐A (360 nm) radiation into needles of spruce (Picea engelmannii Parry ex. Engelm.) and fir [Abies lasiocarpa (Hook.) Nutt. var. Iasiocrpa] was examined. The distribution of collimated and scattered light in intact needles was measured by quartz fiber optic microprobes. Both blue light and UV‐A were attenuated more rapidly with depth in fir than in spruce, although the light profiles for the two light regimes were different; blue light penetrated to a greater depth than UV‐A, Removal of the epicuticular wax from the needle surface increased the amount of internal blue light slightly, but had little effect on the amount of UV‐A. The differences in light penetration in light penetration in spruce and fir may be caused bhy different pigmentation and leaf anatomy.

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