You are not currently logged in.
Access JSTOR through your library or other institution:
Enzyme Activities Associated with Carbon Dioxide Exchange in Illuminated Leaves of Hordeum vulgare L.
P. FAIR, J. TEW and C. F. CRESSWELL
Annals of Botany
New Series, Vol. 37, No. 152 (September 1973), pp. 831-844
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/42752161
Page Count: 14
You can always find the topics here!Topics: Nitrates, Carbon dioxide, Enzyme activity, Enzymes, Leaves, Oxidases, Plants, Photorespiration, Oxygen, Photosynthesis
Were these topics helpful?See something inaccurate? Let us know!
Select the topics that are inaccurate.
Preview not available
The carbon dioxide compensation point (I') was found to vary under constant environmental conditions, as the duration of light treatment increased, and also with leaf age. The activities of RuDP carboxylase, catalase, glycollate oxidase, and nitrate reductase were found to vary with duration of the light treatment during the course of a single day. RuDP carboxylase activity was found to exhibit a rhythmic fluctuation of activity with age, which had a frequency common to all the leaves examined. The activities of RuDP carboxylase, glycollate oxidase, and nitrate reductase in the leaves was found to increase with ascending leaf position; the activities generally decreased with leaf age. The ratio of nitrate reductase activity to RuDP carboxylase activity was found to give an excellent correlation with measured Г, and the value of nitrate reductase as an indirect measure of photorespiration and the relationship between nitrogen metabolism and photorespiration is discussed.
Annals of Botany © 1973 Oxford University Press