Date of Award:
5-1980
Document Type:
Thesis
Degree Name:
Master of Science (MS)
Department:
Wildland Resources
Department name when degree awarded
Range Ecology
Committee Chair(s)
Martyn M. Caldwell
Committee
Martyn M. Caldwell
Committee
Herman Wiebe
Committee
Jon Takemoto
Abstract
Damage to primary photosynthetic reactions caused by environmental stress can be assessed by measurement of chlorophyll fluorescence induction in intact leaves. This approach was applied in studies of ultraviolet-B photoinhibition of photosynthesis in Pisum sativum L. and Rumex patientia L. leaves. At ultraviolet-B dose rates insufficient to cause inhibition of net photosynthesis, changes in the magnitude of fluorescence transients did occur, which suggested direct effects on chloroplast pigments in Pisum and inhibition of photosynthetic electron transport between the photosystems in both species. Leaves of these two species subjected to a much higher dose rate had a significant reduction of net photosynthesis and changes in the magnitude of fluorescence transients that indicated partial loss of water-splitting capability and direct effects on chloroplast pigments. Ultraviolet radiation-induced changes of photosynthetic thylakoid membranes may be ultimately responsible for these disruptions of the primary photosynthetic reactions.
Checksum
90423e4a0bf7a56702179c8a882b24cd
Recommended Citation
Nowak, Robert S., "Chlorophyll Fluorescence Probe of Ultraviolet-B Photoinhibition of Primary Photoreactions in Intact Leaves" (1980). All Graduate Theses and Dissertations, Spring 1920 to Summer 2023. 6365.
https://digitalcommons.usu.edu/etd/6365
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