20.500.12556/DiRROS-17903 Influence of UV-B radiation on Norway spruce seedlings (Picea abies (L.) Karst.) Vpliv UV-B sevanja na sejanke smreke (Picea abies (L.) Karst.) On the basis of the hypothesis that the ultraviolet radiation is one of the main causes for damage at higher altitudes, we have monitored the effect of UVradiation on Norway spruce for two and a half years. The influence of UV-B radiation on Picea abies (L). Karst.seedlings cultured in pots in open greenhouses was examined by measuring photochemical efficiency of photosystem II, changes in chlorophyll a, b, and changes in anthocyanins. The seedlings were grown in a mixture of peat and vermiculite (4:1). We used Osram ultravitaluks bulbs as a source of UV-B radiation. In the experiment plants were treated with 21.24+-3.5 kJ/m2 and 31.9+-2.5 KJ/m2. The control plants were grown under ambient conditions in the greenhouse without artificial source of UV-B radiation. The mean yearly values were as high as 11.5+-5.2 kJ/m2. The photochemical efficiency of photosystem II (PS II) in experimental plants did not vary during the experiment. It showed obvious decrease in the winter period, due to low temperatures and physical draught. The decrease in chlorophyll a and b, was already detected after one year of treatment with simultaneous changes in a/b ration. An increase of anthocyanins amount was detected as well. Picea abies true false true Slovenian Medical Society - Section of Radiology ; Croatian Medical Association - Croatian Society of Radiology Ljubljana Angleški jezik Slovenski jezik by Authors Neznano 2024-01-19 13:38:42 2024-01-19 13:38:42 2024-01-20 03:46:22 0000-00-00 00:00:00 1998 0 0 Life sciences '97 and 2nd Slovenian-Croatian meeting on Molecular oncology today; 1997 Oct 16-19; Gozd Martuljek; BSDOCID37113; str. 83-87 št. 1 Let. 32 1998 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 1998-01-01 57 1318-2099 7680217 RAZ_Bavcon_Joze_1998.pdf RAZ_Bavcon_Joze_1998.pdf 1 6F8CE77B4FDE0281DBB642D3CE565538 ee29ace8fd45bf5a96bba31383a5cd72009b0474fba67c252090f03002159e47 e528eeaf-b6c7-11ee-b0d4-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=24275 Onkološki inštitut Ljubljana 0 0 0