C3 and CAM Photosynthetic Characteristics of the Submerged Aquatic Macrophyte Littorella uniflora: Regulation of Leaf Internal CO2 Supply in Response to Variation in Rooting Substrate Inorganic Carbon Concentration

  title={C3 and CAM Photosynthetic Characteristics of the Submerged Aquatic Macrophyte Littorella uniflora: Regulation of Leaf Internal CO2 Supply in Response to Variation in Rooting Substrate Inorganic Carbon Concentration},
  author={Wendy E. Robe and Howard Griffiths},
  journal={Journal of Experimental Botany},
  • W. Robe, H. Griffiths
  • Published 1 October 1988
  • Environmental Science
  • Journal of Experimental Botany
Robe, W. E. and Griffiths, H. 1988. C3 and CAM photosynthetic characteristics of the submerged aquatic macrophyte Littorella uniflora: regulation of leaf internal C02 supply in response to variation in rooting substrate inorganic carbon concentration.--J. exp. Bot. 39: 1397-1410. The relationships between C02 concentrating mechanisms, photosynthetic efficiency and inorganic carbon supply have been investigated for the aquatic macrophyte Littorella uniflora. Plants were obtained from Esthwaite… 
Photosynthesis of Littorella uniflora grown under two PAR regimes: C3 and CAM gas exchange and the regulation of internal CO2 and O2 concentrations
PAR rather than CO2 supply appeared to limit photosynthesis even in high PAR grown plants, and CAM appears to have an important role in the regulation ofCO2 supply for photosynthesis in response to variation in light regime.
Seasonal variation in the ecophysiology of Littorella uniflora (L.) Ascherson in acidic and eutrophic habitats
The environment was more favourable for plant growth at Esthwaite Water (the eutrophic site) than at Red Tarn (acidic) and the relationships between environmental conditions and plant performance at the two sites are discussed in the context of the disappearance of L. uniflora from acidic and eUTrophic sites in N. Europe in recent years.
Adaptations for an amphibious life: changes in leaf morphology, growth rate, carbon and nitrogen investment, and reproduction during adjustment to emersion by the freshwater macrophyte Littorella uniflora
The combination of continuous, submersed vegetative spread with the capacity for a high degree of phenotypic plasticity allowing some flower and seed production to occur during brief periods of emersion seems to account for the success of this plant in the amphibious niche.
Seasonal variation in crassulacean acid metabolism by the aquatic isoetid Littorella uniflora
The suggested role of CAM as a carbon conserving mechanism of importance for survival in a carbon-limited habitat is supported, and the ratio of CAM activity to photosynthetic capacity was higher in summer compared with winter plants.
Interdependence of CO2 and inorganic nitrogen on crassulacean acid metabolism and efficiency of nitrogen use by Littorella uniflora (L.) Aschers
The hypothesis is tested that crassulacean acid metabolism (CAM) in isoetids is a mechanism which not only conserves inorganic carbon but also plays a role in nitrogen economy of the plants. This
Carbon Dioxide Concentrating Mechanisms and the Evolution of CAM in Vascular Epiphytes
It was shown that a C4-acid pathway could spatially (C4 plants) and temporally (CAM) improve the efficiency of C3 carboxylation by reducing photorespiration, acting in effect as a C02 concentrating mechanism.
CAM photosynthesis in submerged aquatic plants
It is concluded that similar proportions of the aquatic and terrestrial floras have evolved CAM photosynthesis, and it is hypothesized that neotropical lacustrine species may be more ancient in origin and have given rise to terrestrial species, which have retained most of the characteristics of their aquatic ancestry.
The impact of NOinf3sup− loading on the freshwater macrophyte Littorella uniflora: N utilization strategy in a slow-growing species from oligotrophic habitats
The findings suggest that L. uniflora is not growth limited by low NOinf3sup−supply in natural oligotophic habitats, due not to an efficient photosynthetic nitrogen use but to a slow growth rate, a low N requirement and to the use of storage to avoid N stress.
Physiological and photosynthetic plasticity in the amphibious, freshwater plant, Littorella uniflora, during the transition from aquatic to dry terrestrial environments
Overall, L. uniflora showed considerable phenotypic plasticity, yet seemed to remain poised for resubmersion; these characteristics could be adaptive in the unpredictable water margin habitat.


Sources of Inorganic Carbon Acquired through CAM in Littorella uniflora (L.) Aschers
Madsen, T. V. 1987. Sources of inorganic carbon acquired through CAM in Littorella uniflora (L.) Aschers.—J. exp. Bot. 38: 367-377. The C02 dynamics of the lacunal air and the relative contribution
Summary The significance of CAM as a carbon-conserving mechanism in two submerged aquatics, Littorella uniflora (L.) Aschers and hoetes lacustris L., was evaluated by determining (1) the loss of
The role of CO2 uptake by roots and CAM in acquisition of inorganic C by plants of the isoetid life-form: a review, with new data on Eriocaulon decangulare L.
The work described here shows that submerged specimens of the North American Eriocaulon decangulare have a high fraction of their dry weight in the root system, a trait characteristic of isoetids but uncommon in other submerged vascular plants.
Utilization of Sediment CO2 by Selected North American Isoetids
The photosynthetic uptake of root-zone CO2 was determined for Eriocaulon septangulare, Gratiola aurea, Isoetes macrospora, Littorella uniflora var. americana and Lobelia dortmanna as part of a study
A pH-drift technique was used to calculate free CO2 (CO2) and bicarbonate (HCO ) compensation points for a range of freshwater macrophytes and phytoplankters, and species showed a fairly continuous range in uptake ability with a nearly fifteen-fold difference between the most efficient and least efficient species.
Gas Exchange Characteristics of the Submerged Aquatic Crassulacean Acid Metabolism Plant, Isoetes howellii.
The submerged aquatic plant Isoetes howellii Engelmann possesses Crassulacean acid metabolism (CAM) comparable to that known from terrestrial CAM plants. Infrared gas analysis of submerged leaves
The utilization of bicarbonate ions by the macroalga Ascophyllum nodosum (L.) Le Jolis
Calculating the total inorganic carbon concentration from pH measurements and acidification CO2 determinations revealed that the assumption that the alkalinity remains constant during pH drift experiments is not always valid.
Phytoplankton and Epiphyte Development and Their Shading Effect on Submerged Macrophytes in Lakes of Different Nutrient Status
The annual mean light intensity at the depth limit of the Littorella vegetation was 24–33% of the subsurface light intensity, despite large variations in each attenuation component (lake water,
Functional Significance of Different Pathways of CO 2 Fixation in Photosynthesis
The functional significance of different photosynthetic CO2 fixation pathways is a question which can be answered in many ways, each being appropriate to certain scales of enquiry, and how photosynthesis contributes, directly or indirectly, to performance and survival of plants in diverse habitats is shown.