CO2 uptake patterns depend on water current velocity and shoot morphology in submerged stream macrophytes.

Nielsen, Hanne Dalsgaard, Nielsen, Soren Laurentius and Madsen, Tom Vindbaek (2006) CO2 uptake patterns depend on water current velocity and shoot morphology in submerged stream macrophytes. Freshwater Biology, 51 (7). pp. 1331-1340. ISSN 1365 2427

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1. The influence of current velocity on the pattern of photosynthetic CO2 uptake in three species of submerged stream macrophytes was described by analysing the grain density in autoradiographs of leaves exposed to 14CO2.

2. In Elodea canadensis, the CO2 uptake was approximately two-fold higher near the leaf periphery compared with the midrib section at high current velocity, whereas at low current velocity the area of relatively high CO2 uptake expanded from the leaf periphery towards the midrib and basal sections of the leaves.

3. In Potamogeton crispus and Callitriche stagnalis the CO2 uptake was uniform throughout the leaves at low current velocity, whereas at high current velocity the CO2 uptake appeared to increase randomly in some areas of the leaves.

4. The relationship between the photosynthetic CO2 uptake pattern and the dynamics of flow surrounding submerged shoots at low and high current velocity is discussed in relation to shoot morphology. In E. canadensis, thick diffusive boundary layers may develop between leaves because of screening effects at high current velocity. Increased diffusion path for CO2 may contribute to inhibitory effects on photosynthesis in this species.

Item Type: Article
Print ISSN: 1365 2427
Uncontrolled Keywords: Macrophytes; Autoradiography; Plant morphology; Boundary layer; CO2 uptake; Streams; Flow velocity;
University Divisions/Research Centres: Faculty of Health, Life & Social Sciences > School of Life Sciences
Dewey Decimal Subjects: 500 Science > 570 Life sciences; biology > 572 Biochemistry
500 Science > 570 Life sciences; biology > 575 Specific parts of & systems in plants
Library of Congress Subjects: Q Science > QK Botany
Q Science > QH Natural history > QH301 Biology
Item ID: 1737
Depositing User: RAE Import
Date Deposited: 17 Jul 2008 14:34
Last Modified: 21 Mar 2013 14:26

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