Abstract
Ultraviolet-B light (UV-B) and ultraviolet-A light (UV-A) at higher doses exert a strong inhibitory (‘toxic’) effect on axis growth in Scots pine (Pinus sylvestris L.) seedlings. This effect is unrelated to control of growth rate by phytochrome. Rather, after a ‘toxic’ UV dose growth of the pine seedling no longer responded to phytochrome. Both, the effect of UV-B as well as the inhibiting effect of UV-A could be photoreactivated by blue light (B). The action of UV-A was 2 fold: (i) it exerted a ‘toxic’ effect which could be photoreactivated by B, and (ii) applied after UV-B it photoreactivated to some extent the ‘toxic’ UV-B effect. Obviously, the UV-A range causes a ‘toxic’ effect, and at the same time is capable of photoreactivating the ‘toxic’ UV effect. At higher doses the ‘toxic’ effect prevails.
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