Author/Editor		Mazej, Zdenka; Gaberščik, Alenka
Title		ETS-activity as a measure of vitality of different macrophyte species
Type		članek
Source		Phyton-Ann Rei Bot A
Vol. and No.		Letnik 39, št. 3 Spec Iss
Publication year		1999
Volume		str. 181-5
Language		eng
Abstract		The ETS (electron transport system) activity was examined in differmt mocrophyte species. ETS activity shows metabolic potential of the plant while dark respiration rate provides an information on metabolic activity under given condition. In vivo, enzymes may be subjected to the other regulation mechanisms and actual respiration is lower. Certain organisms are capable of responding to the changes in the environment, changing enzyme concentration. Batrachium trichophyllum, which colonised shelter littoral and can also survive on the land, had high ETS activity potential whole the season. High values enable this species to survive under changing conditions. The species with wide ecological tolerance Elodea canadensis, Myriophyllum spicatum, Potamogeton perfoliatus and Potamogeton crispus reached high ETS activity, as well. The vitality of Potamogeton crispus was very low when the species was in decline whereas the young plants that appeared in the autumn had approximately 10 times higher ETS activity. Fontinalis antipyretica and Chara sp. exhibit the lowest ETS activity, because of relatively stable environment above all temperature conditions in deeper water layers. The ratio between actual dark respiration and the ETS activity for different species was calculated. Most species studied use only small part of respiration enzymes (DR/ETS is from 0.08 to 0.35) under unstressed conditions.
Descriptors		PLANTS ELECTRON TRANSPORT OXYGEN CONSUMPTION ECOSYSTEM PLANT LEAVES