Premium
The influence of environmental factors on apparent photosynthesis and respiration of the submersed macrophyte Elodea canadensis
Author(s) -
SIMPSON P. S.,
EATON J. W.,
HARDWICK K.
Publication year - 1980
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/1365-3040.ep11586879
Subject(s) - elodea canadensis , photosynthesis , hydrocharitaceae , photorespiration , respiration , botany , macrophyte , biology , aquatic plant , biomass (ecology) , algae , oxygen , chemistry , agronomy , ecology , organic chemistry
Oxygen effects on apparent photosynthetic and dark respiratory O 2 exchange rates of detached leaves of Elodea canadensis Michx. (Hydrocharitaceae) were determined over a range of conditions which the submersed plant is likely to experience in shallow water. Apparent photosynthesis is inhibited by O 2 under all the experimental regimes of light, temperature, CO 2 concentration and pH. This inhibition is not caused solely by an accelerated rate of dark respiration, and the observed variations in O 2 inhibition are comparable to O 2 effects on photosynthesis and photorespiration of terrestrial C 3 plants. Percentage inhibition of apparent photosynthesis is enhanced by high O 2 and also by low CO 2 . These results indicate that high O 2 , high pH and low CO 2 conditions could cause major losses in photosynthetic activity under field conditions. This may account for some of the losses in biomass that are observed under still water conditions.