Author/Editor		Gaberščik, Alenka; Novak, Mateja; Trošt, Tadeja; Mazej, Zdenka; Germ, Mateja; Bjoern, Lars-Olof
Title		The influence of enhanced UV-B radiation on the spring geophyte Pulmonaria officinalis
Type		članek
Source		Plant Ecol Dordr
Vol. and No.		Letnik 154, št. 1-2
Publication year		2001
Volume		str. 51-6
Language		eng
Abstract		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.
Descriptors		PLANTS ULTRAVIOLET RAYS CHLOROPHYLL CAROTENOIDS OZONE PLANT LEAVES