Observations with the electron microscope onAsteromonas gracilisArtari emend. (Stephanoptera gracilis(Artari) wisl.), with some comparative observations onDunaliellaSp

Péterfi, Leontin Ştefan; Manton, I.

doi:10.1080/00071616800650021

Cited by 51 publications

(17 citation statements)

References 22 publications

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“…1, 2), especially in young cells. The ultrastructure of the flagellar apparatus of Dunaliella has been studied extensively (Peterfi and Manton 1968;Hyams and Chasey 1974;Eyden 1975;Hoshaw and Malouf 1981;Melkonian and Preisig 1984;Marano et al 1985;Watanabe and Floyd 1989;Marano 1992) and is typical of the Chlorophyceae and Prasinophyceae.…”

Section: Morphology Of Dunaliellamentioning

confidence: 99%

The taxonomy of the genus Dunaliella (Chlorophyta, Dunaliellales) with emphasis on the marine and halophilic species

2007

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The taxonomy of the green algal genus Dunaliella is often seen as confusing and the names associated with species in culture collections are sometimes suspect. This paper evaluates and reviews the current taxonomy based on morphological and biochemical characters of this genus. The life history of Dunaliella is also presented. The variability, stability and usefulness of the main characters used to characterise the taxa are evaluated, based both on the literature and on a detailed examination of the Dunaliella strains in the Murdoch University Microalgae Culture Collection. A detailed updated description and key to the 22 species and a number of varieties and forms of the marine and halophilic species of Dunaliella currently recognised is given to allow researchers to identify their strains.

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Section: Morphology Of Dunaliellamentioning

confidence: 99%

The taxonomy of the genus Dunaliella (Chlorophyta, Dunaliellales) with emphasis on the marine and halophilic species

2007

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“…Despite much information about the ultrastructure (Trezzi, GalH, and Bellini, 1964;BerkalofT, 1966;Le BaronMarano and Izard, 1968;Peterfi and Manton, 1968;Werz and Kellner, 1970;Levain and Le Baron-Marano, 1973;Eyden, 1975;Vladimirova, 1978) and the physiological properties (Gimmler, Schirling and Tobler, 1977;Ben-Amotz and Avron, 1978;Gimmler and Schirling, 1978), little attention has been given to the cell surface and none to the possible existence of a cell coat in these algae. In the present study, the surface coat of Dunaliella tertiolecta is examined with the use of the cationic dyes, alcian blue and ruthenium red, in conjunction with enzymic treatments.…”

Section: Introductionmentioning

confidence: 99%

ULTRASTRUCTURAL OBSERVATION OF THE SURFACE COAT OF DUNALIELLA TERTIOLECTA FROM STAINING WITH CATIONIC DYES AND ENZYME TREATMENTS*

1980

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SUMMARYThe surface coat of the cell-wall-lacking alga Dunaliella tertiolecta has been examined with the use of the cationic dyes, alcian blue atid ruthenium red. The previously undetected existence of a glycocalyx-type cell envelope is described. The results from enzymic digestions suggest a gross similarity in the biochemical nature of the coat of Dunaliella with that reported for other eukaryotic cell types. The biological significance of this surface coat is discussed in relation to the absence of a rigid cell wall and the known ability of such algae to withstand extreme changes in the osmotic potential of the growth medium.

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“…The kinetics of photosynthetic resumption preceded the kinetics of glycerol biosynthesis. The above results indicate the existence of osmotic regulations in Asteromonasgracilis via the accumulation of intracelular glycerol.Asteromonas gracilis Artari is a green wall-less unicellular flagellate of the class Prasinophyceae present in salt marshes and small brine ponds (10,15,17,19,20). The algae are often subjected to widely fluctuating salt concentrations and can tolerate a broad range of salt, from low salinity to saturated NaCl solutions.…”

mentioning

confidence: 99%

“…Asteromonas gracilis Artari is a green wall-less unicellular flagellate of the class Prasinophyceae present in salt marshes and small brine ponds (10,15,17,19,20). The algae are often subjected to widely fluctuating salt concentrations and can tolerate a broad range of salt, from low salinity to saturated NaCl solutions.…”

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Osmoregulation in the Halotolerant Alga Asteromonas gracilis

Ben‐Amotz¹,

Grunwald²

1981

Plant Physiol.

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Asteromonas gracilis, a green wall-less halotolerant alga, grows on salt concentrations from 0.5 molar NaCl (seawater) to saturation (4.5 molar NaCI). The specific growth rate was maximal at concentrations between 0.5 and 2.5 molar and only graduaDly decreased above 2.5 molar. Photosynthetic oxygen evolution was maximal over a range of salinities around 2.5 molar and the photosynthesis to respiration ratio showed a maximum at 1.5 molar NaCI. The alga accumulates large amounts of intraceDlular glycerol in response to saline conditions. The glycerol content of the cells varied in direct proportion to the extracellular salt concentration, being about 50 and 400 picograms glycerol per cell in algae grown at 0.5 and 4.5 molar NaCI, respectively. In salt concentrations lower than 3.5 molar and at growth temperatures below 40 C, essentialy al the glycerol was intraceHular. Above 3.5 molar NaCI, about 25 per cent of the total glycerol leaked slowly from the cels to the medium. Treating the algae for several minutes at temperatures exceeding 47 C caused 50 per cent release of the internal glycerol. At 60 C, 100 per cent of the glycerol was released. When the extraceHular salt concentration was increased or decreased, the intracelular glycerol varied accordingly, reaching its new intracelular level after a few hours. Both photosynthesis and respiration were inhibited on transfer of the cels from 1.5 to 3.5 molar NaCI but were not inhibited on transfer of the cels from 3.5 to 1.5 molar NaCI. The kinetics of photosynthetic resumption preceded the kinetics of glycerol biosynthesis. The above results indicate the existence of osmotic regulations in Asteromonasgracilis via the accumulation of intracelular glycerol.Asteromonas gracilis Artari is a green wall-less unicellular flagellate of the class Prasinophyceae present in salt marshes and small brine ponds (10,15,17,19,20). The algae are often subjected to widely fluctuating salt concentrations and can tolerate a broad range of salt, from low salinity to saturated NaCl solutions. In contrast to the many studies which were undertaken on the halotolerant alga Dunaliella (9) to elucidate the mechanism of its osmotic adaptation under salt stress (2, 4-8), the information on osmoregulation in Asteromonas is rather limited. Recently BenAmotz and Avron (5) showed that Asteromonas and Dunaliella produce and accumulate glycerol to a concentration isoosmotic with the medium and, thus, are able to survive in saline water. The communication presented here describes an investigation of the physiological behavior of A. gracilis under salt stress.

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Observations with the electron microscope onAsteromonas gracilisArtari emend. (Stephanoptera gracilis(Artari) wisl.), with some comparative observations onDunaliellaSp

Cited by 51 publications

References 22 publications

The taxonomy of the genus Dunaliella (Chlorophyta, Dunaliellales) with emphasis on the marine and halophilic species

The taxonomy of the genus Dunaliella (Chlorophyta, Dunaliellales) with emphasis on the marine and halophilic species

ULTRASTRUCTURAL OBSERVATION OF THE SURFACE COAT OF DUNALIELLA TERTIOLECTA FROM STAINING WITH CATIONIC DYES AND ENZYME TREATMENTS*

Osmoregulation in the Halotolerant Alga Asteromonas gracilis

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