Effect of Enhanced UV-B Radiation on Chlorophyll a Fluorescence Parameters in Norway Spruce Needles

0170605 - UEK-B 20013071 RIV US eng J - Journal Article
Šprtová, Miroslava - Nedbal, Ladislav - Marek, Michal V.
Effect of Enhanced UV-B Radiation on Chlorophyll a Fluorescence Parameters in Norway Spruce Needles.
Journal of Plant Physiology. Roč. 156, č. 2 (2000), s. 234-241. ISSN 0176-1617. E-ISSN 1618-1328
Institutional research plan: CEZ:AV0Z6087904
Keywords : Norway spruce * chlorophyll fluorescence * fluorescence quenching
Subject RIV: CB - Analytical Chemistry, Separation
Impact factor: 0.943, year: 2000

Cloned saplings of Norway spruce (7 years old) were continuously exposed to enhanced UV-B irradiation (+25%) over three growing seasons. An analysis of variable chlorophyll a fluorescence was performed at the beginning (June) and the end (September) of the third growing season in order to evaluate the longterm effects of elevated W-B irradiation on the primary photosynthetic reactions. A time-dependent response to elevated UV-B radiation was observed. The saturated PPFD electron transport rate (ETR) in the control (C-variant) was 1.92 times that of the exposed plants (E-variant). The midday depression of the maximal photochemical yield of PSII (F-V/F-M) was deeper in the E-variants, and the extent of this depression, as compared with the C-variants, increased at the end of the growing season.
Permanent Link: http://hdl.handle.net/11104/0067689