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|The Physical Object|
Photosynthetic assimilation of exogenous 14CO2 and H14CO3− by the aquatic angiosperm Potamogeton lucens L. is reported. Equivalent maximum rates of assimilation . Lucas WJ, Tyree MT, Petrov A () Characterization of photosynthetic 14 carbon assimilation by Potamogeton lucens L. J Exp Bot – Google Scholar Ludlow MM Cited by: The ability of somePotamogeton species to use bicarbonate for photosynthesis was assayed by means of relative net photosynthetic rates in alkaline (bicarbonate) and acid (free CO2) solutions with an equivalent amount of inorganic carbon. The results showedPotamogeton crispus, P. oxyphyllus, P. maackianus, P. perfoliatus, P. malaianus and the submerged leaves ofP. distinctus to Cited by: The submerged leaf forms of Potamogeton were able to utilize HCO~- in water because they extracted the majority of the DIC-pool (residual DIC at %) and the CO2 con- centration available at the final pH in drift experiments (less than buM CO2, Table 3) was markedly below the typical CO2 compensation points ( /zM) observed, when H Cited by:
The contribution of internal and external CO2 to photosynthesis was determined as the difference in CO, uptake and oxygen release, where excess oxygen release reflected the assimilation of CO2. The photosynthetic rates at air equilibrium and a total inorganic carbon concentration of mM were 2–3 times lower than maximum rates at CO2 saturation for the HCO3 users and 10–14 times. PHOTOSYNTHETIC CARBON ASSIMILATION IN AQUATIC MACROPHYTES 17 We opportunistically assumed the following: a constant CO2 concentration at the base of the stem; that the lacunal system was a longitudinal hollow cylin- der with no obstacles and no exchange of CO2 along the route; CO2 use at the apex only, i.e. simulating the situation in a dense Cited by: s. c. maberly, the interdependence of photon irradiance and free carbon dioxide or bicarbonate concentration on the photosynthetic compensation points .
Photosynthetic carbon uptakes of floating and submersed leaves of the pondweed Potamogeton natans L. and submersed leaves of Ranunculus fluitans Lam. were studied in a number of KHCO 3 media of varying pH (7–) and concentration (1–12 mM). Photosynthetic rates of the floating and submersed leaves of P. natans correlated with free-CO 2 concentrations and were independent of HCO 3 Cited by: HCO~- assimilation by Potamogeton lucens: polar cation transport and the role of H+ extrusion. In: W.J. Lucas and J.A. Berry (Editors), Inorganic Carbon Uptake by Aquatic Photosynthetic Cited by: J. B. REISKIND, T. V. MADSEN, L. C. GINKEL and G. BOWES, Evidence that inducible C4‐type photosynthesis is a chloroplastic CO2‐concentrating mechanism in Plant, Cell & Environment, 14, 2, ( , The isolation of leaf protoplasts from the submerged aquatic angiosperm Potamogeton lucens L., Plant. The maintenance of high proton-H + permeability of the plasma membrane, for example, which is key for photosynthetic bicarbonate assimilation [52, 53], declines at reduced external pH . In.