出版社：Forestry Commission of the Hungarian Academy of Sciences
摘要：Our work aimed to reveal UV-B sensitivity of beech both in field, and in outdoor
conditions. We examined the role of UV-B radiation in activation of photoprotective mechanisms in
photoinhibition and photodamage of photosynthetic apparatus under hight light intensity. Our results
indicate that under natural irradiances increase of carotenoid content - especially xantophyll cycle
pigments - and xantophyll cycle activity resulted in not only by visible light but also by UV-B
radiation. These pigments have important role in photoprotective processes of photosynthetic
apparatus. Amount of these pigments decreased under UV-B exclusion, increased under UV-B
exposure, similarly to the UV-B absorbing compounds, which responded susceptibly to changes of
UV-B level. These results may suggest that high UV-B tolerance of beech is due to the considerable
flavonoid accumulation, which may explain practically unaltered physiological activity of
photosynthetic apparatus under UV-B exposition, as these compounds have antioxidant capacity, thus
they can reduce lipid peroxidation and damage of photosynthetic apparatus.
