We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
CHLOROPHYLL FLUORESCENCE AS A BIOINDICATOR OF EFFECTS ON GROWTH IN AQUATIC MACROPHYTES FROM MIXTURES OF POLYCYCLIC AROMATIC HYDROCARBONS.
- Authors
Marwood, Christopher A.; Solomon, Keith R.; Greenberg, Bruce M.
- Abstract
Chlorophyll-a fluorescence induction is a rapid technique for measuring photosynthetic electron transport in plants. To assess chlorophyll-a fluorescence as a bioindicator of effects of polycyclic aromatic hydrocarbon mixtures, chlorophyll-a fluorescence parameters and plant growth responses to exposure to the wood preservative creosote were examined in the aquatic plants Lemna gibba and Myriophyllum spicatum. Exposure to creosote inhibited growth of L. gibba (EC50 = 7.2 mg/L total polycyclic aromatic hydrocarbons) and M. spicatum (EC50 = 2.6 mg/L) despite differences in physiology. Creosote also diminished maximum PSII efficiency (Fv/Fm) (EC50 = 36 and 13 mg/L for L. gibba and M. spicatum) and the effective yield of photosystem II photochemistry (ΔF/F′m (EC50 = 13 and 15 mg/L for L. gibba and M. spicatum). The similarity between growth and chlorophyll-a fluorescence DF/F9m EC50s and slopes of the response curves suggests a close mechanistic link between these end points. The predictive power of chlorophyll-a fluorescence as a bioindicator of whole-organism effects applied to complex contaminant mixtures is discussed.
- Subjects
CHLOROPHYLL; FLUORESCENCE; PHOTOSYNTHESIS; ELECTRON transport; PLANTS
- Publication
Environmental Toxicology & Chemistry, 2001, Vol 20, Issue 4, p890
- ISSN
0730-7268
- Publication type
Article
- DOI
10.1002/etc.5620200425