ibclogo XVI International Botanical Congess


Abstract Number: 4725
Poster No. = 2227


THE USE OF CHLOROPHYLL FLUORSCENCE TO EXAMIN THE EFFECTS OF WATER QUALITY ON PRIMARY PHOTOCHEMISTRY.


J.G. Lebkuecher & R.A. Houtman, Austin Peay State University, Clarksville, TN 37044, U.S.A.


A two-second pulse of saturating irradiance was used to generate a chlorophyll a fluorescence induction curve from dark-adapted Selenastrum capricornutum grown in situ within streams of differing water quality. Induction-curve cardinal points and cardinal-point ratios are used to describe the use of chlorophyll a fluorescence to examine the effects of water quality on primary photochemistry. The results demonstrate that chlorophyll a fluorescence is an effective tool to examine the effects of water quality on photosystem II function and development.


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