Salzgehalt und Photosynthese bei marinen Pflanzen

Hammer, Lieselotte

doi:10.1007/bf00347110

Cited by 22 publications

(8 citation statements)

References 7 publications

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“…According to Gessner (1969) permeability to water is reduced by hypotonic stress. The most important factor for photosynthesis of marine plants is the relatively high alkalinity of natural seawater, and the ensuing increase in the carbon supply as compared to diluted seawater (Hammer 1968). According to Nygren (1975), high dilution of seawater causes a reduction in the essential trace elements needed for growth.…”

Section: Resultsmentioning

confidence: 99%

Salinity Induced Changes in Peroxidase Activity in the Green Seaweed Ulva lactuca

Murthy¹,

Sharma²,

Rao³

1988

Botm

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Fronds of Ulva lactuca were cultured in seawater of different salinity levels for 20 days under laboratory conditions, and their cytoplasmic peroxidase activities determined. The activity was maximal in normal seawater (100%) but it significantly decreased at hypo-and hypertonic concentrations. The decrease in the activity was gradual under hypersaline conditions. However, a steep fall resulted when the concentration decreased from normal to hyposaline. Increase in the frond length revealed a similar pattern. From these studies, it is inferred that the species is more tolerant to hypersalities than to hyposalinities of seawater.

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Section: Resultsmentioning

confidence: 99%

Salinity Induced Changes in Peroxidase Activity in the Green Seaweed Ulva lactuca

Murthy¹,

Sharma²,

Rao³

1988

Botm

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“…Most important for the photosynthesis of marine plants is the relatively high alkalinity and the ensuing increase in carbon supply in natural waters compared to diluted sea water (Buch, 1945;Hammer, 1968). Most important for the photosynthesis of marine plants is the relatively high alkalinity and the ensuing increase in carbon supply in natural waters compared to diluted sea water (Buch, 1945;Hammer, 1968).…”

Section: Discussionmentioning

confidence: 99%

Influence of Salinity on the Growth and Distribution of Some Phaeophyceae on the Swedish West Coast

Nygren¹

1975

Botanica Marina

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Growth at different salinities of four taxa of Phaeophyceae was related to the distribution along the Swedish West Coast. Pilayella littoralis f. rupincola enters the Baltic. It was found to be less sensitive to reduced salinity than Litosiphon pusillus and Striaria attenuata, which have their limit of distribution outside the Baltic. Although capable of complete development in the Baltic, Ectocarpus säiculosus var. penicillatus showed poor growth at reduced salinity, and it is suggested that there may be a distinct strain adapted to the extremely low salinity in this area.

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“…Werden UlvaArten aus Meerwasser in Leitungswasser fiberffihrt, zeigen sie eine Depression der Photosyathese, die jedoch durch ein genfigend hohes Angebot an C02 bzw. HCOa e aufgehoben werden kann (Hammer, 1968).…”

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Wirkung unterschiedlicher Konzentrationen von NaCl und anderen osmotisch wirksamen Substanzen auf die CO2-Fixierung der einzelligen Alge Platymonas subcordiformis

Kirst

1975

Oecologia

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The photosynthetic incorporation of HCO by the alga Platymonas subcordiformis decreased with increasing concentrations of NaCl in the medium. There was no correlation between the response of P. subcordiformis to salinity in high or low NaCl-concentrations in the growing solution. When other osmotic substances were used (KCl, sucrose, sorbitol, manitol, xylitol) the incorporation of C also decreased. Under low salt conditions the decline of photosynthesis depended on the NaCl concentration of the culture medium (adaptation).In contrast to photosynthesis incorporation of HCO in the dark increased with hypo- or hyperosmotic stress. The increase depended on the concentration of added NaCl (or other osmotic substances) and on the salinity of the growing solution (adaptation).The incorporation of radiocarbon into the neutral fraction (carbohydrates) during photosynthesis was remarkably stimulated by hyperosmotic conditions whereas hypoosmotic stress caused a decrease. This was due to the change of the content of mannitol under different osmotic stresses.Compared with the control incorporation rates of C into amino acids and organic acids were lower with both hypo- and hyperosmotic stress. As a consequence of the declining incorporation ofC into mannitol after hypoosmotic stress the distribution of radiocarbon in the amino acid, organic acid, and neutral fraction was changed. Incorporation rates of C into the control and into algae after hyperosmotic stress were in the order, neutral fraction ≫ amino acids> organic acids, while incorporation rates after hypoosmotic stress were in the order, amino acids > organic acids, neutral fraction. The most labelled individual amino acids were glutamate, alanine, aspartate, and proline. The incorporation into alanine increased with hyperosmotic conditions. The most labelled organic acids were citrate and malate. C-fixation in the dark resulted in strong labelling of amino acids and organic acids and low incorporation into the neutral fraction. Fixation rates ofC with hyperosmotic stress were in the order, amino acids ≫ neutral fraction > organic acids. In constrast, the rates with hypoosmotic conditions were in the order, organic acids > amino acids ≫ neutral fraction. The major portion of the radioactivity of amino acids was found in glutamate, proline, and aspartate. With hyperosmotic stress the incorporation of C into these amino acids increased, while after hypoosmotic stress the incorporation declined. With hyperosmotic conditions a remarkable increase of the organic acids, especially that of malate, was observed. From these data it is suggested that Platymonas has different metabolic responses to hyper- and hyposmotic stress, although with both osmotic stresses the same general effects were observed: a decline in the rate of photosynthesis and stimulation of CO-fixation in the dark.

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Salzgehalt und Photosynthese bei marinen Pflanzen

Cited by 22 publications

References 7 publications

Salinity Induced Changes in Peroxidase Activity in the Green Seaweed Ulva lactuca

Salinity Induced Changes in Peroxidase Activity in the Green Seaweed Ulva lactuca

Influence of Salinity on the Growth and Distribution of Some Phaeophyceae on the Swedish West Coast

Wirkung unterschiedlicher Konzentrationen von NaCl und anderen osmotisch wirksamen Substanzen auf die CO2-Fixierung der einzelligen Alge Platymonas subcordiformis

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