Relations between K+ uptake and photosynthetic uptake of inorganic carbon by aquatic plants

1997 ◽  
Vol 39 (4) ◽  
pp. 599-606 ◽  
Author(s):  
L. Adamec
Keyword(s):  
Aquatic Plants ◽  
Inorganic Carbon ◽  
K Uptake

scholarly journals Increase of 14C Activity of Dissolved Inorganic Carbon Along a River Course

Radiocarbon ◽  
1986 ◽  
Vol 28 (2A) ◽  
pp. 515-521 ◽  
Author(s):  
Dušan Srdoč ◽  
Ines Krajcar-Bronić ◽  
Nada Horvatinčić ◽  
Bogomil Obelić
Keyword(s):  
Aquatic Plants ◽  
Water Samples ◽  
Organic Material ◽  
Root Respiration ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Stream Water ◽  
Exchange Process ◽  
Karst Spring ◽  
Stream Waters

Results of measurements for 3 years (1981–1983) of 14C activity of dissolved inorganic carbon (DIG) in water samples from the Korana River, as well as that of recent tufa and aquatic plants, showed that 14C concentration increases from karst spring to the estuary. A model describing the increase of 14C activity was developed assuming that the increase is due to the exchange of the dissolved CO2 in stream water with atmospheric CO2 and to dissolution of CO2 from the decay of organic material and root respiration. It is possible to distinguish these two contributions by measuring the δ13C values of DIC in water. As expected, our data show that the exchange process between atmospheric CO2 and DIC dominates at rapids and waterfalls, while biologic contribution is much higher in lakes and along the lowland flow of the Korana River. Agreement between the calculated and the measured activities supports the proposed mechanisms of chemical and isotopic exchanges in stream waters.

THE ACQUISITION OF INORGANIC CARBON IN MARINE MACROPHYTES

1998 ◽  
Vol 46 (2) ◽  
pp. 83-87 ◽  
Author(s):  
Sven Beer
Keyword(s):  
Carbonic Anhydrase ◽  
Aquatic Plants ◽  
Inorganic Carbon ◽  
External Medium ◽  
Uptake Mechanism ◽  
Tropical Regions ◽  
Marine Macrophytes ◽  
Photosynthetic Carbon ◽  
Diffusion Rates ◽  
Carbon Transport

The low diffusion rates of solutes in water call for a separation of photosynthetic carbon acquirement in aquatic plants into carbon transport and the subsequent photosynthetic reduction of CO2. This paper will focus on the transport of inorganic carbon from the external medium to the site of fixation in marine macrophytes. In accord with the much higher concentration of HCO3− than of CO2 in seawater, most marine macrophytes can utilize the ionic carbon form for their photosynthetic needs. The two known ways of HCO, utilization are (a) via extracellular, carbonic anhydrase catalyzed dehydration of HCO3− to form CO2, which then diffuses into the photosynthesizing cells, and (b) by direct uptake via a transporter. While the first way may be sufficient to support low rates of photosynthesis in temperate regions, it is viewed as futile under situations where high temperatures and irradiances would cause a high pH to form close to the uptake site of carbon and where, consequently, the CO2/HCO3− ratio would be very low. Therefore, it may well be that the direct HCO3− uptake mechanism described for Ulva from more tropical regions confers an adaptational advantage under conditions conducive to higher photosynthetic rates.

An Analytical Model of Photosynthetic Response of Aquatic Plants to Inorganic Carbon and pH

Ecology ◽  
1981 ◽  
Vol 62 (3) ◽  
pp. 697-705 ◽  
Author(s):  
J. A. Weber ◽  
J. D. Tenhunen ◽  
S. S. Westrin ◽  
C. S. Yocum ◽  
D. M. Gates
Keyword(s):  
Analytical Model ◽  
Aquatic Plants ◽  
Inorganic Carbon ◽  
Photosynthetic Response

scholarly journals Carbon Uptake in Aquatic Plants Deduced From Their Natural 13C and 14C Content

Radiocarbon ◽  
1989 ◽  
Vol 31 (03) ◽  
pp. 785-794 ◽  
Author(s):  
Elena Marčenko ◽  
Dušan Srdoč ◽  
Stjepko Golubić ◽  
Jože Pezdič ◽  
M J Head
Keyword(s):  
Carbon Source ◽  
Aquatic Plants ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Natural Habitat ◽  
Terrestrial Plants ◽  
Activity Measurements ◽  
Aquatic Mosses ◽  
Age Correction ◽  
Karst Waters

δ13C and 14C activity measurements were made on terrestrial, marsh and aquatic plants growing in their natural habitat of the Plitvice Lakes in northwest Yugoslavia. δ13C values were ca −47 for aquatic mosses, which indicate that the carbon source was dissolved inorganic carbon (DIC) from alkaline karst waters, following a C3 pathway, and ca −25 for marsh plants, indicating the carbon source was atmospheric CO2. 14C activity of true aquatic plants and submerged parts of helophytes was close to 14C activity of DIC, whereas that of emergent parts of helophytes and terrestrial plants was similar to atmospheric CO2 activity. Aquatic plants which use DIC in freshwater for their photosynthesis are not suitable for 14C dating, unless the initial activity of incorporated carbon is known. δ13C values of plant material also depend on the carbon source and cannot be used for 14C age correction.

Photosynthesis and inorganic carbon acquisition in the cyanobacterium Chlorogloeopsis sp. ATCC 27193

1997 ◽  
Vol 99 (1) ◽  
pp. 81-88
Author(s):  
Robert S. Skleryk ◽  
Pascal N. Tyrrell ◽  
George S. Espie
Keyword(s):  
Inorganic Carbon ◽  
Inorganic Carbon Acquisition

Mercury gas exchange from aquatic plants

2003 ◽  
Vol 107 ◽  
pp. 1075-1078 ◽  
Author(s):  
L. Poissant ◽  
C. Beauvais ◽  
M. Pilote
Keyword(s):  
Gas Exchange ◽  
Aquatic Plants
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