Observations on unusual akinete formation inAnabaena azollae in isolation culture

1989 ◽  
Vol 99 (5) ◽  
pp. 467-471
Author(s):  
B S Vaidya ◽  
Johny Thomas
Keyword(s):  
Akinete Formation

scholarly journals Pre-akinete formation in Zygnema sp. from polar habitats is associated with metabolite re-arrangement

2020 ◽  
Vol 71 (11) ◽  
pp. 3314-3322 ◽  
Author(s):  
Erwann Arc ◽  
Martina Pichrtová ◽  
Ilse Kranner ◽  
Andreas Holzinger
Keyword(s):  
Environmental Conditions ◽  
Morphological Changes ◽  
Tca Cycle ◽  
Survival Strategies ◽  
Polar Regions ◽  
Akinete Formation ◽  
Metabolite Profiles ◽  
Dividing Cells ◽  
Storage Products ◽  
Chloroplast Morphology

Abstract In streptophytic green algae in the genus Zygnema, pre-akinete formation is considered a key survival strategy under extreme environmental conditions in alpine and polar regions. The transition from young, dividing cells to pre-akinetes is associated with morphological changes and the accumulation of storage products. Understanding the underlying metabolic changes could provide insights into survival strategies in polar habitats. Here, GC-MS-based metabolite profiling was used to study the metabolic signature associated with pre-akinete formation in Zygnema sp. from polar regions under laboratory conditions, induced by water and nutrient depletion, or collected in the field. Light microscopy and TEM revealed drastic changes in chloroplast morphology and ultrastructure, degradation of starch grains, and accumulation of lipid bodies in pre-akinetes. Accordingly, the metabolite profiles upon pre-akinete formation reflected a gradual shift in metabolic activity. Compared with young cells, pre-akinetes showed an overall reduction in primary metabolites such as amino acids and intermediates of the tricarboxylic acid (TCA) cycle, consistent with a lower metabolic turnover, while they accumulated lipids and oligosaccharides. Overall, the transition to the pre-akinete stage involves re-allocation of photosynthetically fixed energy into storage instead of growth, supporting survival of extreme environmental conditions.

The fine structure of akinete formation and germination in Cylindrospermum

1968 ◽  
Vol 60 (4) ◽  
pp. 303-313 ◽  
Author(s):  
Marcia Madsen Miller ◽  
Norma J. Lang
Keyword(s):  
Fine Structure ◽  
Akinete Formation

The Developmental Biology of Heterocyst and Akinete Formation in Cyanobacteria

1981 ◽  
Vol 9 (1) ◽  
pp. 45-100 ◽  
Author(s):  
David G. Adams ◽  
Noel G. Carr ◽  
Michael Wilcox
Keyword(s):  
Developmental Biology ◽  
Akinete Formation

scholarly journals Formation of lipid bodies and changes in fatty acid composition upon pre-akinete formation in Arctic and AntarcticZygnema(Zygnematophyceae, Streptophyta) strains

2016 ◽  
Vol 92 (7) ◽  
pp. fiw096 ◽  
Author(s):  
Martina Pichrtová ◽  
Erwann Arc ◽  
Wolfgang Stöggl ◽  
Ilse Kranner ◽  
Tomáš Hájek ◽  
...  
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Lipid Bodies ◽  
Akinete Formation
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