Nonheterocytous cyanobacteria from <scp>B</scp>razilian saline‐alkaline lakes

Andreote, Ana Paula Dini; Vaz, Marcelo Gomes Marçal Vieira; Genuário, Diego Bonaldo; Barbiéro, Laurent; Rezende-Filho, Ary Tavares; Fiore, Marli Fátima

doi:10.1111/jpy.12192

Cited by 59 publications

(53 citation statements)

References 57 publications

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“…The phylogenetic reconstruction based on 16S rRNA sequences suggest that all heterocytous cyanobacteria (Nostocales) form a single monophyletic group (Henson et al , 2004a; Tomitani et al , 2006; Shih et al , 2013) and support the polyphyly of true branching cyanobacteria (Figure 4). In addition, our analysis corroborates other molecular data from 16S rRNA sequences that demonstrate a polyphyletic origin of the unicellular and filamentous homocytous strains (Figure 4) (Litvaitis, 2002; Valério et al , 2009; Andreote et al , 2014; Silva et al , 2014). …”

Section: Can N2 Fixation Strategies Be Associated With Cyanobacterialsupporting

confidence: 89%

Cyanobacterial nitrogenases: phylogenetic diversity, regulation and functional predictions

et al. 2017

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Cyanobacteria is a remarkable group of prokaryotic photosynthetic microorganisms, with several genera capable of fixing atmospheric nitrogen (N2) and presenting a wide range of morphologies. Although the nitrogenase complex is not present in all cyanobacterial taxa, it is spread across several cyanobacterial strains. The nitrogenase complex has also a high theoretical potential for biofuel production, since H2 is a by-product produced during N2 fixation. In this review we discuss the significance of a relatively wide variety of cell morphologies and metabolic strategies that allow spatial and temporal separation of N2 fixation from photosynthesis in cyanobacteria. Phylogenetic reconstructions based on 16S rRNA and nifD gene sequences shed light on the evolutionary history of the two genes. Our results demonstrated that (i) sequences of genes involved in nitrogen fixation (nifD) from several morphologically distinct strains of cyanobacteria are grouped in similarity with their morphology classification and phylogeny, and (ii) nifD genes from heterocytous strains share a common ancestor. By using this data we also discuss the evolutionary importance of processes such as horizontal gene transfer and genetic duplication for nitrogenase evolution and diversification. Finally, we discuss the importance of H2 synthesis in cyanobacteria, as well as strategies and challenges to improve cyanobacterial H2 production.

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Section: Can N2 Fixation Strategies Be Associated With Cyanobacterialsupporting

confidence: 89%

Cyanobacterial nitrogenases: phylogenetic diversity, regulation and functional predictions

et al. 2017

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“…The saline lakes may also present different colors such as green, black, or crystalline, while the freshwater lakes present crystalline water due to the bloom of cyanobacteria (see example in Figure 1e). The Nhecolândia saline lakes tend to be more perennial, normally devoid of vegetation, and with high concentrations of cyanobacteria; on the other hand, the freshwater lakes are mostly temporarily affected by the flood pulse and have large amounts of aquatic macrophytes [7,13,29,68,69]. That explains why the GP model using the NDWI and MNDWI indexes presented the best correlation with the field-measured pH values.…”

Section: Regression Models For Predicting Ph In Lakesmentioning

confidence: 98%

Estimating Water pH Using Cloud-Based Landsat Images for a New Classification of the Nhecolândia Lakes (Brazilian Pantanal)

et al. 2020

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The Nhecolândia region, located in the southern portion of the Pantanal wetland area, is a unique lacustrine system where tens of thousands of saline-alkaline and freshwater lakes and ponds coexist in close proximity. These lakes are suspected to be a strong source of greenhouse gases (GHGs) to the atmosphere, the water pH being one of the key factors in controlling the biogeochemical functioning and, consequently, production and emission of GHGs in these lakes. Here, we present a new field-validated classification of the Nhecolândia lakes using water pH values estimated based on a cloud-based Landsat (5 TM, 7 ETM+, and 8 OLI) 2002–2017 time-series in the Google Earth Engine platform. Calibrated top-of-atmosphere (TOA) reflectance collections with the Fmask method were used to ensure the usage of only cloud-free pixels, resulting in a dataset of 2081 scenes. The pH values were predicted by applying linear multiple regression and symbolic regression based on genetic programming (GP). The regression model presented an R2 value of 0.81 and pH values ranging from 4.69 to 11.64. A lake mask was used to extract the predicted pH band that was then classified into three lake classes according to their pH values: Freshwater (pH < 8), oligosaline (pH 8–8.9), and saline (≥9). Nearly 12,150 lakes were mapped with those with saline waters accounting for 7.25%. Finally, a trend surface map was created using the ALOS PRISM Digital Surface Model (DSM) to analyze the correlation between landscape features (topography, connection with the regional drainage system, size, and shape of lakes) and types of lakes. The analysis was in consonance with previous studies that pointed out that saline lakes tend to occur in lower positions compared to freshwater lakes. The results open a relevant perspective for the transfer of locally acquired experimental data to the regional balances of the Nhecolândia lakes.

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“…This habitat is characterized by reduced species diversity and only highly specialized organisms are able to thrive there, including some members of the phylum Cyanobacteria (Andreote et al. , Genuário et al. ).…”

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confidence: 99%

The novel strain Desmonostoc salinum CCM‐UFV059 shows higher salt and desiccation resistance compared to the model strain Nostoc sp. PCC7120

Alvarenga

Lucius

Vaz

et al. 2020

Journal of Phycology

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Desmonostoc salinum CCM‐UFV059 (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. PCC7120 (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 N2–fixing cyanobacteria.

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Nonheterocytous cyanobacteria from Brazilian saline‐alkaline lakes

Cited by 59 publications

References 57 publications

Cyanobacterial nitrogenases: phylogenetic diversity, regulation and functional predictions

Cyanobacterial nitrogenases: phylogenetic diversity, regulation and functional predictions

Estimating Water pH Using Cloud-Based Landsat Images for a New Classification of the Nhecolândia Lakes (Brazilian Pantanal)

The novel strain Desmonostoc salinum CCM‐UFV059 shows higher salt and desiccation resistance compared to the model strain Nostoc sp. PCC7120

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