Responses of photosynthetic activity in the drought-tolerant cyanobacterium, Nostoc flagelliforme to rehydration at different temperature

Zhao, Xueyong; Bi, Yonghong; Chen, L.; Hu, Shi; Hu, Zhengyu

doi:10.1016/j.jaridenv.2007.07.002

Cited by 30 publications

(18 citation statements)

References 30 publications

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“…Temperature has also been shown to affect cyanobacterial photosynthetic activity. Although cyanobacteria have a wide range of temperature tolerances, Zhao et al (2008) have shown that variations in the rate of photosynthetic recovery after a dormant phase in Nostoc flagelliforme are due to different water absorption rates at higher temperatures. Thus whilst higher temperatures may lead to an increase in photosynthetic rates because of faster water adsorption, ultimately the duration of active photosynthesis will be significantly reduced because of more rapid rates of desiccation.…”

Section: Carbon Metabolismmentioning

confidence: 99%

Extracellular polysaccharides from cyanobacterial soil crusts: A review of their role in dryland soil processes

Mager

Thomas

2011

Journal of Arid Environments

305

183

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Cyanobacterial soil crusts are a community of microorganisms living in the soil surface of different habitats worldwide. Through photosynthesis, cyanobacteria produce extracellular polysaccharides (EPS) increasing the soil carbon (C) pool as carbohydrates. The layer of polysaccharides also acts as a mechanical structure surrounding the filamentous cyanobacteria that together with the soil particles form stable aggregates in the topsoil thus decreasing C loss by erosion. Thus despite their apparent importance to the dryland system we have only a limited understanding of their role and possible applications in dryland soil environments. This review draws on these disparate sources of information in order to provide a summary of our understanding of the characteristics, behaviour and influence of cyanobacterial EPS in dryland soils and makes recommendations for further research

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Section: Carbon Metabolismmentioning

confidence: 99%

Extracellular polysaccharides from cyanobacterial soil crusts: A review of their role in dryland soil processes

Mager

Thomas

2011

Journal of Arid Environments

305

183

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“…It is extremely harsh niches let N. flagelliforme evolve abilities for desiccation tolerance and UV insensitivity (Gao and Ye, 2007;Ferroni et al, 2010;Shang et al, 2018). During the last 30 years, studies have focused on specific structural, physiological and proteomic aspects of desiccation-tolerant cyanobacteria (Potts, 1999;Qiu et al, 2003;Gao and Ye, 2007;Zhao et al, 2008;Liang et al, 2012;Liu et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Genomic and transcriptomic insights into the survival of the subaerial cyanobacterium Nostoc flagelliforme in arid and exposed habitats

Shang

Chen

Hou

et al. 2019

Environmental Microbiology

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Summary The cyanobacterium Nostoc flagelliforme is an extremophile that thrives under extraordinary desiccation and ultraviolet (UV) radiation conditions. To investigate its survival strategies, we performed whole‐genome sequencing of N. flagelliforme CCNUN1 and transcriptional profiling of its field populations upon rehydration in BG11 medium. The genome of N. flagelliforme is 10.23 Mb in size and contains 10 825 predicted protein‐encoding genes, making it one of the largest complete genomes of cyanobacteria reported to date. Comparative genomics analysis among 20 cyanobacterial strains revealed that genes related to DNA replication, recombination and repair had disproportionately high contributions to the genome expansion. The ability of N. flagelliforme to thrive under extreme abiotic stresses is supported by the acquisition of genes involved in the protection of photosynthetic apparatus, the formation of monounsaturated fatty acids, responses to UV radiation, and a peculiar role of ornithine metabolism. Transcriptome analysis revealed a distinct acclimation strategy to rehydration, including the strong constitutive expression of genes encoding photosystem I assembly factors and the involvement of post‐transcriptional control mechanisms of photosynthetic resuscitation. Our results provide insights into the adaptive mechanisms of subaerial cyanobacteria in their harsh habitats and have important implications to understand the evolutionary transition of cyanobacteria from aquatic environments to terrestrial ecosystems.

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“…Photosynthetic activity in BSCs can be triggered by very small amounts of moisture, including dew and fog [13,14], and can be sustained over a wide range of moisture conditions [15]. Elbert et al [9] estimate the median net uptake of C by BSCs in drylands to be 16 g m 22 yr 21 with a total annual net C uptake of 1.0 Pg yr 21 .…”

Section: Introductionmentioning

confidence: 99%

Impact of grazing intensity on seasonal variations in soil organic carbon and soil CO ₂ efflux in two semiarid grasslands in southern Botswana

Thomas

2012

Phil. Trans. R. Soc. B

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Biological soil crusts (BSCs) are an important source of organic carbon, and affect a range of ecosystem functions in arid and semiarid environments. Yet the impact of grazing disturbance on crust properties and soil CO 2 efflux remain poorly studied, particularly in African ecosystems. The effects of burial under wind-blown sand, disaggregation and removal of BSCs on seasonal variations in soil CO 2 efflux, soil organic carbon, chlorophyll a and scytonemin were investigated at two sites in the Kalahari of southern Botswana. Field experiments were employed to isolate CO 2 efflux originating from BSCs in order to estimate the C exchange within the crust. Organic carbon was not evenly distributed through the soil profile but concentrated in the BSC. Soil CO 2 efflux was higher in Kalahari Sand than in calcrete soils, but rates varied significantly with seasonal changes in moisture and temperature. BSCs at both sites were a small net sink of C to the soil. Soil CO 2 efflux was significantly higher in sand soils where the BSC was removed, and on calcrete where the BSC was buried under sand. The BSC removal and burial under sand also significantly reduced chlorophyll a, organic carbon and scytonemin. Disaggregation of the soil crust, however, led to increases in chlorophyll a and organic carbon. The data confirm the importance of BSCs for C cycling in drylands and indicate intensive grazing, which destroys BSCs through trampling and burial, will adversely affect C sequestration and storage. Managed grazing, where soil surfaces are only lightly disturbed, would help maintain a positive carbon balance in African drylands.

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Responses of photosynthetic activity in the drought-tolerant cyanobacterium, Nostoc flagelliforme to rehydration at different temperature

Cited by 30 publications

References 30 publications

Extracellular polysaccharides from cyanobacterial soil crusts: A review of their role in dryland soil processes

Extracellular polysaccharides from cyanobacterial soil crusts: A review of their role in dryland soil processes

Genomic and transcriptomic insights into the survival of the subaerial cyanobacterium Nostoc flagelliforme in arid and exposed habitats

Impact of grazing intensity on seasonal variations in soil organic carbon and soil CO ₂ efflux in two semiarid grasslands in southern Botswana

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Responses of photosynthetic activity in the drought-tolerant cyanobacterium, Nostoc flagelliforme to rehydration at different temperature

Cited by 30 publications

References 30 publications

Extracellular polysaccharides from cyanobacterial soil crusts: A review of their role in dryland soil processes

Extracellular polysaccharides from cyanobacterial soil crusts: A review of their role in dryland soil processes

Genomic and transcriptomic insights into the survival of the subaerial cyanobacterium Nostoc flagelliforme in arid and exposed habitats

Impact of grazing intensity on seasonal variations in soil organic carbon and soil CO 2 efflux in two semiarid grasslands in southern Botswana

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Product

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Impact of grazing intensity on seasonal variations in soil organic carbon and soil CO ₂ efflux in two semiarid grasslands in southern Botswana