Rhythmic release of dissolved free amino acids from partly synchronized Thalassiosira rotula under nearly natural conditions

Hammer, K. D.; Brockmann, U. H.

doi:10.1007/bf00403456

Cited by 30 publications

(16 citation statements)

References 20 publications

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“…Hammer & Brockmann (1983) have reported that the presence of LYS, GLY, SER, ALA and VAL in the culture medium corresponds with cell division; while accumulation of LEU and GLU was in phase with the light period. Under large enclosure experimental conditions, it was demonstrated that low C/N amino acids (e.g.…”

Section: Discussionmentioning

confidence: 99%

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Interspecific and intraspecific composition and variation of free amino acids in marine phytoplankton

Martin‐Jézéquel¹,

Poulet²,

Harris³

et al. 1988

Mar. Ecol. Prog. Ser.

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Concentration and variation of 16 free amino acids were measured in the internal and external pools of 11 marine phytoplankton species belonging to 5 taxonomic classes in culture. Changes detected in each pool were related to both the species, classes and phases of growth. The intracellular and extracellular pools had a different con~position. The internal pool was characterized by aspartic acid, glutamic acid, serine, glutamine and leucine, which accounted for > 7 0 % of the total concentration. The extracellular pool was characterized by senne, glycine, leucine and lysine, accounting for >?O "10 of the total concentration. The proportions and combinations of these compounds were variable and enabled the species and classes of phytoplankton to be grouped according to their internal and external amino acids content. The abundance and flux of free amino acids seem to be related to both the size, biomass and metabolic activity and the growth conditions of the phytoplankton.

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Section: Discussionmentioning

confidence: 99%

“…Laboratory experiments allow a more accurate estimation of the contribution of phytoplankton to the pool of dissolved free amino acids (Hammer & Eberlein 1981, Hammer & Brockmann 1983, Poulet & MartinJezequel 1983, Admiraal et al 1984. Is the intracellular pool of free amino acids characteristic of particular species?…”

mentioning

confidence: 99%

Interspecific and intraspecific composition and variation of free amino acids in marine phytoplankton

Martin‐Jézéquel¹,

Poulet²,

Harris³

et al. 1988

Mar. Ecol. Prog. Ser.

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“…This is not true of all algal species: in cultures of the symbiotic green alga Chlamydomonas provasolii, amino acids were prominent among the exudates (Saks, 1982). Excretion of DFAA may be a normal attribute of planktic diatoms as it has b e e n established now for several cultured species (Hammer a n d Brockmann, 1983;Poulet and Martin-Jezequel, 1983;Admiraal et al, unpubl.). In accordance, increased DFAA concentrations have been correlated with phytoplankton blooms (Hammer and Eberlein, 1981;Keller et al, 1982).…”

Section: A Y Smentioning

confidence: 99%

“…The quantitative importance of phytoplankton extracellular release has been studied extensively. Whereas the release of amino acids by phytoplankton has occasionally been documented (Watt, 1969;Gocke, 1970;Hammer and Brockmann. 1983;Poulet and Martin-Jezequel, 1983), information on benthic micro-algae is lacking.…”

mentioning

confidence: 99%

Participation of diatoms in the amino acid cycle of coastal waters; uptake and excretion in cultures

Admiraal¹,

Laane²,

Peletier³

1984

Mar. Ecol. Prog. Ser.

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Micro-algae are thought to be involved in the turnover of pools of dissolved free amino acids (DFAA) in seawater either by their excretion or by the uptake of these compounds. Our study showed that, in vitro, 3 benthic diatom species were able to deplete small additions of individual Lamino acids down to concentrations below 10 to 40 nmol I-', as determined by HPLC. When nitrogen was limited, all test species scavenged their media for 10 or 11 amino acids added but Amphiprora cf. paludosa assimilated 3 amino acids also in the presence of surplus nitrate. Navicula salinarum took up all 10 amino acids supplied, whereas Nitzschia closterium assimilated none of them, when nitrate was present. Excretion of DFAA could not be detected in the medium of growing nitrate-sufficient cultures; N. clostenum, N. saljnaium and A. cf. paludosa excreted respectively less than 0.03, 0.05 and 0.1 Oh of the cellular nitrogen as amino acids. Only silicate deprivation induced A. cf. paludosa to excrete 1 % cellular nitrogen as DFAA. The results show that benthic diatom populations may act as net consumers of DFAA, even when the concentrations are as low as 100 to 1,000 nmol I-', the range reported for nearshore seawater and the porewater of mudflats.

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“…Williams (1981) cited evidence that 8S much 8S 50% of primary production may pass through the dissolved organic pool. Poulet and Hartln-Jezequel (1983) and Hammer and BroCkman (1983) observed highest release of dissolved free amino acids in algal cultures nearing stationary phase.…”

Section: List Of Tables (Continued)mentioning

confidence: 90%

Primary production of particulate protein amino acids : algal protein metabolism and its relationship to the composition of particulate organic matter

Lohrenz¹

1985

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Rhythmic release of dissolved free amino acids from partly synchronized Thalassiosira rotula under nearly natural conditions

Cited by 30 publications

References 20 publications

Interspecific and intraspecific composition and variation of free amino acids in marine phytoplankton

Interspecific and intraspecific composition and variation of free amino acids in marine phytoplankton

Participation of diatoms in the amino acid cycle of coastal waters; uptake and excretion in cultures

Primary production of particulate protein amino acids : algal protein metabolism and its relationship to the composition of particulate organic matter

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