Uptake of magnesium, strontium, barium, and manganese byPlectonema boryanum (Cyanophyceae) with special reference to polyphosphate bodies

Baxter, Michael V.; Jensen, T. E.

doi:10.1007/bf01279371

Cited by 75 publications

(45 citation statements)

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“…1982. The presence of polyphosphate bodies in bacteria, cyanobacteria, and freshwater unicellular algae has been widely reported (Harold 1966, Baxter & Jensen 1980, Sicko-Goad & Lazinsky 1986, Goldberg et al 2001. P limitation is a typical phenomenon in freshwater systems (Schindler 1977).…”

Section: Discussionmentioning

confidence: 99%

“…Pb, Mg, Zn, Cd, Sr, Co, Hg, Ni, Cu) can be sequestered in polyphosphate bodies by cyanobacteria and eukaryotic algae (Sicko-Goad & Stoermer 1979, Baxter & Jensen 1980, Jensen et al 1982a,b, Rachlin et al 1982. The presence of polyphosphate bodies in bacteria, cyanobacteria, and freshwater unicellular algae has been widely reported (Harold 1966, Baxter & Jensen 1980, Sicko-Goad & Lazinsky 1986, Goldberg et al 2001. P limitation is a typical phenomenon in freshwater systems (Schindler 1977).…”

Section: Discussionmentioning

confidence: 99%

“…Several studies have documented that many metals (e.g. Pb, Mg, Zn, Cd, Sr, Co, Hg, Ni, Cu) can be sequestered in polyphosphate bodies by cyanobacteria and eukaryotic algae (Sicko-Goad & Stoermer 1979, Baxter & Jensen 1980, Jensen et al 1982a,b, Rachlin et al. 1982.…”

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Biological uptake of Cd, Se(IV) and Zn by Chlamydomonas reinhardtii in response to different phosphate and nitrate additions

Wang

2004

Aquat. Microb. Ecol.

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We investigated the influences of different nutrient regimes on the accumulation of Cd, Zn, and Se(IV) in the freshwater green alga Chlamydomonas reinhardtii over a 4 h exposure period. After the cells had been acclimated to different ambient P levels from 0.1 to 10.0 µM for 2 d in different media (buffer, basic and simplified uptake media), their intracellular metal concentrations increased by 3.6 to 14× for Cd and 1.6 to 4.0× for Zn. Se uptake was, however, decreased by 7.7 to 44×. Semi-continuous culture experiments further demonstrated that the alga's metal concentrations were enhanced 26× for Cd and 8.0× for Zn, whereas Se accumulation was inhibited 75× at the same medium P levels. The uptake rates in semi-continuous cultures increased by 269× for Cd and 11× for Zn, but Se uptake decreased 92× with increasing P concentration. Medium P additions also significantly increased intracellular partitioning for Cd and Zn, but there was no apparent effect for Se. For P-starved or P-repleted cells, the P-enriched medium dramatically increased the cellular accumulation of Cd and Zn compared with the P-depleted medium. A surge uptake of Cd and Zn occurred in P-starved cells. P starvation also resulted in a remarkable increase in Se accumulation in the Pdeplete medium. N enrichment from 5 to 200 µM significantly increased the alga's uptake and intracellular partitioning for Cd and Zn, although the effects were not strictly concentration-dependent. Our study strongly suggests that ambient P enrichment greatly stimulates Cd and Zn accumulation and sequestration in C. reinhardtii, presumably due to rapid P uptake and subsequent formation of polyphosphate in the cells, and distinctly inhibits Se uptake possibly due to the competition of similar anionic forms for transport between Se and P. KEY WORDS: Uptake · Metals · Green alga · Nutrient enrichment Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 35: [163][164][165][166][167][168][169][170][171][172][173] 2004 concentrations in phytoplankton, especially in freshwater species, although this may be important in understanding the stoichiometric mechanisms in lake systems.Under N-limited conditions, a significant reduction in photosynthetic activity occurs in green algae, including a sharp decline in their chlorophyll content and a rise in carotenoid concentration (Sayed 1998, Hanagata & Dubinsky 1999. When the phytoplankton are under P-limited conditions, the uptake system for phosphate in cells is highly activated. Abrupt exogenous P enrichment results in a rapid P incorporation and storage in intracellular polyphosphates (Kulaev & Vagabov 1983, Wagner & Falkner 2001. Polyphosphate bodies are considered an important pool for the sequestration of heavy metals by freshwater phytoplankton (e.g. Cd, Hg, Pb, and Zn) (Jensen et al. 1982a). Although metal limitation (e.g. of Fe) in phytoplankton may affect the assimilation of nitrate and phosphate (McKay et al. 2001), the effects of nutrient enrichment or starvation on m...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Biological uptake of Cd, Se(IV) and Zn by Chlamydomonas reinhardtii in response to different phosphate and nitrate additions

Wang

2004

Aquat. Microb. Ecol.

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“…Polyphosphate bodies contain metals, mostly potassium, calcium, and magnesium (Sicko-Goad et al 1975;Baxter & Jensen 1980aStewart et al 1978). Polyphosphate bodies in heterocysts of Anabaena showed an increased content of S and Mo and a reduction in the Ca content (Stewart et al 1978).…”

Section: Characteristics and Enzymologymentioning

confidence: 99%

Formation and functional significance of storage products in cyanobacteria

Kromkamp

1987

New Zealand Journal of Marine and Freshwater Research

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The most common storage products of cyanobacteria are polyphosphate as a phosphorus storage compound, cyanophycin or phycobilin protein pigment as nitrogen storage products, and glycogen as a storage product of both carbon and energy. Nutrient uptake kinetics are regulated by the storage pools, and the patterns of regulation have a feedback effect on the amount of accumulated nutrient in the cells. Besides having a storage function the nutrient storage products are likely to act as metabolic sinks during conditions of energy stress. Regulation of storage products is especially strict in light-limited cultures. By increasing the rate of polysaccharide formation during growth with short photoperiods, cyanobacteria are able to sustain relatively high growth rates. This effect is enhanced by keeping respiratory losses very low.

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“…Positive correlations may reflect occurrence of elements in similar cell compartments, or direct chemical association. P is known, for example, to be chemically associated with a range of metals in polyphosphate bodies (Peverley et al 1978, Baxter & Jensen 1980, Jensen et al 1982, Siderius et al 1996.…”

Section: Elemental Correlation Patternmentioning

confidence: 99%

Elemental composition of depth samples of Ceratium hirundinella (Pyrrophyta) within a stratified lake: an X-ray microanalytical study

Sigee¹,

Levado²,

Dodwell³

1999

Aquat. Microb. Ecol.

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The elemental composition of Ceratium hirundinella cells was investigated in mixed phytoplankton samples collected from the water column of a stratified lake. X-ray rnicroanalysis (XRMA) routinely detected Mg, Si, P, Cl, K and Ca with occasional peaks of Na. Al and Fe. Cell concentrations of most elements showed no significant variation within the epilimnion, but Mg, P, C1 and K were significantly lower (and Si higher) in cells from the metalirnnion. Ratios of Mg/K, P/K, Mg/P, monovalent/divalent cations and diffusible anions/cations were constant throughout the sampled water column. Within depth populations of Ceratium, concentrations of each element varied considerably, approximating (except Si) to a normal distribution. Approximately 5 % of all cells had abnormally low concentrations of K and were possibly undergoing senescence. Correlation and factor analysis demonstrated a major statistical association between Mg, P, S and K in Ceratium cells throughout the depth samples. The XRMA results suggest an underlying homogeneity in the population of Ceratium throughout the sampled water column, consistent with the known high mobility and rapid migration of these cells within the water body.

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Uptake of magnesium, strontium, barium, and manganese byPlectonema boryanum (Cyanophyceae) with special reference to polyphosphate bodies

Cited by 75 publications

References 15 publications

Biological uptake of Cd, Se(IV) and Zn by Chlamydomonas reinhardtii in response to different phosphate and nitrate additions

Biological uptake of Cd, Se(IV) and Zn by Chlamydomonas reinhardtii in response to different phosphate and nitrate additions

Formation and functional significance of storage products in cyanobacteria

Elemental composition of depth samples of Ceratium hirundinella (Pyrrophyta) within a stratified lake: an X-ray microanalytical study

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