Author/Editor		Germ, M; Gaberščik, A
Title		Comparison of aerial and submerged leaves in two amphibious species, Myosotis scorpioides and Ranunculus trichophyllus
Type		članek
Source		Photosynthetica
Vol. and No.		Letnik 41, št. 1
Publication year		2003
Volume		str. 91-6
Language		eng
Abstract		Both amphibious species, Myosotis scorpioides and Ranunculus trichophyllus, thrive in a stressful environment (alternated flooding and drying), which is variable regarding water and radiation regimes. Plants from the field and plants grown under controlled water table maintained at 40 cm were analysed for content of chlorophyll (Chl) and UV-B screening compounds,-and the efficiencies of PS2 and electron transport systems. We detected no significant differences in contents of Chl and UV-B screening compounds between submerged and aerial leaves. The measurements of respiratory potential and photochemical efficiency revealed the presence of permanent stress in M. scorpioides in the natural environment. Differences in physiological responses of submerged and aerial leaves indicated that the terrestrial environment was more favourable for M. scorpioides than for R. trichophyllus. Characteristics of both species suggested that R. trichophyllus might be a phylogenetically older aquatic plant than M. scorpioides.
Descriptors		FRESH WATER PLANTS ELECTRON TRANSPORT CHLOROPHYLL PLANT LEAVES ULTRAVIOLET RAYS FLUORESCENCE PHOTOSYNTHESIS