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The novel strain Desmonostoc salinum CCM ‐ UFV 059 shows higher salt and desiccation resistance compared to the model strain Nostoc sp. PCC 7120
Author(s) -
Alvarenga Luna Viggiano,
Lucius Stefan,
Vaz Marcelo Gomes Marçal Vieira,
Araújo Wagner L.,
Hagemann Martin
Publication year - 2020
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/jpy.12968
Subject(s) - desiccation , biology , cyanobacteria , nostoc , acclimatization , strain (injury) , sucrose , photosynthesis , botany , trehalose , osmoprotectant , biochemistry , bacteria , proline , genetics , amino acid , anatomy
Desmonostoc salinum CCM ‐ UFV 059 ( Desmonostoc ) is a novel cyanobacterial strain of the order Nostocales isolated from a saline‐alkaline lake. The acclimation towards salt and desiccation stress of Desmonostoc was compared to the related and well‐characterized model strain Nostoc sp. PCC 7120 ( Nostoc ). Salt–stressed cells of Desmonostoc maintained low cellular Na + concentrations and accumulated high amounts of compatible solutes, mainly sucrose and to a lower extent trehalose. These features permitted Desmonostoc to grow and maintain photosynthesis at 2‐fold higher salinities than Nostoc . Moreover, Desmonostoc also induced sucrose over‐accumulation under desiccation, which allowed this strain to recover from this stress in contrast to Nostoc . Additional mechanisms such as the presence of highly unsaturated lipids in the membrane and an efficient ion transport system could also explain, at least partially, how Desmonostoc is able to acclimate to high salinities and to resist longer desiccation periods. Collectively, our results provide first insights into the physiological and metabolic adaptations explaining the remarkable high salt and desiccation tolerance, which qualify Desmonostoc as an attractive model for further analysis of stress acclimation among heterocystous N 2 –fixing cyanobacteria.