Avtor/Urednik     Gaberščik, Alenka; Novak, Mateja; Trošt, Tadeja; Mazej, Zdenka; Germ, Mateja; Bjoern, Lars-Olof
Naslov     The influence of enhanced UV-B radiation on the spring geophyte Pulmonaria officinalis
Tip     članek
Vir     Plant Ecol Dordr
Vol. in št.     Letnik 154, št. 1-2
Leto izdaje     2001
Obseg     str. 51-6
Jezik     eng
Abstrakt     Pulmonaria officinalis is an understorey spring geophyte, which starts its vegetative period before full foliation of the tree storey. During its early growth phase it is exposed to full solar radiation, therefore the enhanced UV-B radiation could present a threat to this species. An outdoor experiment in which potted plants were exposed to below ambient, ambient, and above ambient (corresponding to 17% ozone reduction) UV B radiation, was conducted in order to evaluate the radiation effects. The amount of photosynthetic pigments and photochemical efficiency of PSII were not affected, but the amount of UV-B absorbing compounds was lower in plants grown under reduced UV-B. This change was measurable after only fourteen days in reproductive shoots, while in the vegetative shoots, it was not detectable until after three months. The leaves of P. officinaiis are variegated and the light green spots became less transparent to PAR under enhanced UV-B. The results reveal that under simulated 17% ozone depletion the harmful effects of UV B on the measured parameters were negligible.
Deskriptorji     PLANTS
ULTRAVIOLET RAYS
CHLOROPHYLL
CAROTENOIDS
OZONE
PLANT LEAVES