| Autor: |
LÁPOSI, Réka, VERES, Szilvia, MÉSZÁROS, Ilona |
| Jazyk: |
angličtina |
| Rok vydání: |
2008 |
| Předmět: |
|
| Zdroj: |
Acta Silvatica & Lignaria Hungarica, Vol 4, Pp 7-16 (2008) |
| Popis: |
Our work aimed to reveal UV-B sensitivity of beech both in field, and in outdoorconditions. We examined the role of UV-B radiation in activation of photoprotective mechanisms inphotoinhibition and photodamage of photosynthetic apparatus under hight light intensity. Our resultsindicate that under natural irradiances increase of carotenoid content - especially xantophyll cyclepigments - and xantophyll cycle activity resulted in not only by visible light but also by UV-Bradiation. These pigments have important role in photoprotective processes of photosyntheticapparatus. Amount of these pigments decreased under UV-B exclusion, increased under UV-Bexposure, similarly to the UV-B absorbing compounds, which responded susceptibly to changes ofUV-B level. These results may suggest that high UV-B tolerance of beech is due to the considerableflavonoid accumulation, which may explain practically unaltered physiological activity ofphotosynthetic apparatus under UV-B exposition, as these compounds have antioxidant capacity, thusthey can reduce lipid peroxidation and damage of photosynthetic apparatus. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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