Identification of phytochelatins in the cadmium-stressed conjugating green alga Micrasterias denticulata

Chemosphere ◽  
2013 ◽  
Vol 91 (4) ◽  
pp. 448-454 ◽  
Author(s):  
Stefanie Volland ◽  
Dirk Schaumlöffel ◽  
Dirk Dobritzsch ◽  
Gerd-Joachim Krauss ◽  
Ursula Lütz-Meindl
Keyword(s):  
Green Alga ◽  
Micrasterias Denticulata

scholarly journals Salt stress-induced cell death in the unicellular green alga Micrasterias denticulata

2009 ◽  
Vol 60 (3) ◽  
pp. 939-954 ◽  
Author(s):  
M. J. Affenzeller ◽  
A. Darehshouri ◽  
A. Andosch ◽  
C. Lutz ◽  
U. Lutz-Meindl
Keyword(s):  
Cell Death ◽  
Salt Stress ◽  
Green Alga ◽  
Unicellular Green Alga ◽  
Micrasterias Denticulata

scholarly journals Visualization of particle complexes in the plasma membrane of Micrasterias denticulata associated with the formation of cellulose fibrils in primary and secondary cell walls.

1980 ◽  
Vol 84 (2) ◽  
pp. 327-339 ◽  
Author(s):  
T H Giddings ◽  
D L Brower ◽  
L A Staehelin
Keyword(s):  
Plasma Membrane ◽  
Green Alga ◽  
Plasma Membranes ◽  
Plant Cells ◽  
Higher Plant ◽  
Cellulose Fibrils ◽  
Micrasterias Denticulata ◽  
Wall Growth ◽  
Fern Protonemata ◽  
Center Distance

Highly ordered arrays of intramembrane particles are observed in freeze-fractured plasma membranes of the green alga Micrasterias denticulata during the synthesis of the secondary cell wall. The observable architecture of the complex consists primarily of a precise hexagonal array of from 3 to 175 rosettes, consisting of 6 particles each, which fracture with the P-face. The complexes are observed at the ends of impressions of cellulose fibrils. The distance between rows of rosettes is equal to the center-to-center distance between parallel cellulose fibrils of the secondary wall. Correlation of the structure of the complex with the pattern of deposition indicates that the size of a given fibril is proportional to the number of rosettes engaged in its formation. Vesicles containing hexagonal arrays of rosettes are found in the cytoplasm and can be observed in the process of fusing with the plasma membrane, suggesting that the complexes are first assembled in the cytoplasm and then incorporated into the plasma membrane, where they become active in fibril formation. Single rosettes appear to be responsible for the synthesis of microfibrils during primary wall growth. Similar rosettes have now been detected in a green alga, in fern protonemata, and in higher plant cells. This structure, therefore, probably represents a significant component of the cellulose synthesizing mechanism in a large variety of plant cells.

Photosynthesis and Heat Response of the Green Alga Micrasterias denticulata (Desmidiaceae)

1999 ◽  
Vol 54 (7-8) ◽  
pp. 508-516 ◽  
Author(s):  
Dagmar Weiss ◽  
Cornelius Ltitz ◽  
Ursula Lütz-Meindl
Keyword(s):  
Heat Shock ◽  
Green Alga ◽  
Cell Shape ◽  
Incubation Temperature ◽  
Cultivation Temperature ◽  
Division Rate ◽  
Heat Shocks ◽  
Micrasterias Denticulata ◽  
Cell Shape Formation ◽  
Photosynthesis And Respiration

Abstract Cells of the green alga Micrasterias denticulata cultivated at 15 °C, 20 °C or 25 °C were exposed to heat shocks at different temperatures (30 -40 °C) for varying duration ( 5 - 90 m in). Cell pattern formation, division rate as well as photosynthesis and respiration by measuring oxygen production and consumption have been studied. The degree of cell shape malformations was found dependent on the preceding cultivation temperature along with the mode of the heat shock. Cells cultivated at 15 °C and 20 °C could counteract a 90 min heat shock at 35 °C much better than those cultivated at 25 °C, which was seen by a less reduced young semicell. Cells cultivated at 15 °C and 25 °C reveal a reduced division activity compared to those grown at 20 °C even with a marked retardation when affected by a preceding heat shock. Photosynthesis and the level of plastid pigments (carotenoids, chlorophylls, β-carotene, lutein) of controls determined by HPLC analysis reached a plateau after about 26 days when starting with 22-day old cultures. Photosynthesis and respiration were determined in a range between 15 °C and 40 °C in defined Micrasterias cell cultures of about this age (cultivation temperature 15 °C, 20 °C or 25 °C). Both processes rose steadily with increasing temperature starting with 15 °C and reached peaks between 30 °C and 32 °C, followed by a considerable drop when increasing the incubation temperature up to 40 °C. The experiments reveal that primary processes of energy formation and consumption are much less affected by temperature influences than cell shape formation and division rate

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