Cell damage caused by ultraviolet B radiation in the desert cyanobacterium Phormidium tenue and its recovery process

Wang, Gaohong; Deng, Songqiang; Liu, Jiafeng; Ye, Chaoran; Zhou, Xiangjun; Chen, Lanzhou

doi:10.1016/j.ecoenv.2017.06.024

Cited by 20 publications

(6 citation statements)

References 30 publications

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“…Although the stratospheric environment was different from that on the ground, our results show that crusts microorganisms exhibited activity at a certain period of time during stratospheric exposure. In addition, the antioxidant enzymes activities of the desert cyanobacterium Scytonema javanicum and Phormidium tenue were increased after 30 min of UVB radiation [20,21], indicating that crusts microorganisms were able to quickly respond to stressful environments. In our stratospheric exposure experiment (UVB dose of about 56.45 kJ m −2 , UVC dose of 1.87 kJ m −2 ), the content of EPS was significantly increased (Figure 3a).…”

Section: Damage Degree and Tolerance Mechanisms Of Cyanobacterial Crustsmentioning

confidence: 99%

“…These biological soil composite layers dominated by cyanobacteria are called cyanobacterial crusts (CCs) and comprise a variety of bacteria, archaea, and eukaryotic communities [17][18][19]. Some taxa, especially filamentous cyanobacteria, are UV resistant [20][21][22]. Biological crusts are regarded as ideal model systems because they are easy to manipulate and are sensitive to external environmental changes [23,24].…”

Section: Introductionmentioning

confidence: 99%

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Responses of Cyanobacterial Crusts and Microbial Communities to Extreme Environments of the Stratosphere

Yang

2022

Microorganisms

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How microbial communities respond to extreme conditions in the stratosphere remains unclear. To test this effect, cyanobacterial crusts collected from Tengger Desert were mounted to high balloons and briefly exposed (140 min) to high UV irradiation and low temperature in the stratosphere at an altitude of 32 km. Freezing and thawing treatments were simulated in the laboratory in terms of the temperature fluctuations during flight. Microbial community composition was characterized by sequencing at the level of DNA and RNA. After exposure to the stratosphere, the RNA relative abundances of Kallotenue and Longimicrobium increased by about 2-fold, while those of several dominant cyanobacteria genera changed slightly. The RNA relative abundances of various taxa declined after freezing, but increased after thawing, whereas cyanobacteria exhibited an opposite change trend. The DNA and RNA relative abundances of Nitrososphaeraceae were increased by 1.4~2.3-fold after exposure to the stratosphere or freezing. Exposure to stratospheric environmental conditions had little impact on the total antioxidant capacity, photosynthetic pigment content, and photosynthetic rate, but significantly increased the content of exopolysaccharides by 16%. The three treatments (stratospheric exposure, freezing, and thawing) increased significantly the activities of N-acetyl-β-D-glucosidase (26~30%) and β-glucosidase (14~126%). Our results indicated cyanobacterial crust communities can tolerate exposure to the stratosphere. In the defense process, extracellular organic carbon degradation and transformation play an important role. This study makes the first attempt to explore the response of microbial communities of cyanobacterial crusts to a Mars-like stratospheric extreme environment, which provides a new perspective for studying the space biology of earth communities.

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Section: Damage Degree and Tolerance Mechanisms Of Cyanobacterial Crustsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Responses of Cyanobacterial Crusts and Microbial Communities to Extreme Environments of the Stratosphere

Yang

2022

Microorganisms

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“…Ultraviolet radiation modifies the structure of amino acids, which leads to protein denaturation and enzyme deactivation. This can be due to UV-B destruction of aromatic amino acids (free and within proteins), or to its effect on the disulphide bonds (S-S) in amino acids, which contain a sulfhydryl group in their reaction centre (Hollosy 2002;Vass et al 2005;Xue et al 2005;Castenholz and Garcia-Pichel 2012;Nawkar et al 2013;Wang et al 2017).…”

Section: Uv-b Effects In Cellular Compoundsmentioning

confidence: 99%

“…Lipids: When exposed to UV-B, lipids undergo lipid peroxidation whether they are glycolipids, phospholipids, or unsaturated fatty acids. UV-B exposed phospholipids are sensitive to ROS in two sites: the unsaturated double bond between the carbon atoms and the ester bond between glycerol and fatty acids (Kramer et al 1991;Moorthy & Kathiresan 1998;Hollosy 2002;Bhandari & Sharma 2006;Noaman 2007;Pérez et al 2012;Ganapathy et al 2017;Wang et al 2017). Polyunsaturated fatty acids (PUFAs) in the membrane`s phospholipids are also sensitive to ROS; since hydroxyl radical and singlet oxygen can react with methylene groups of PUFA and form lipid peroxy radicals and hydroperoxide.…”

Section: Uv-b Effects In Cellular Compoundsmentioning

confidence: 99%

Effects of Ultraviolet-B Radiation in Plant Physiology

Nassour

Ayash

2021

Agriculture (Pol'nohospodárstvo)

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Over the past few decades, anthropogenic activities contributed to the depletion of the ozone layer, which increased the levels of solar ultraviolet-B (UV-B) radiation reaching the Earth`s surface. Generally, UV-B is harmful to all living organisms. It damages the cell`s Deoxyribonucleic acid (DNA), proteins, and lipids, and as a consequence, it affects the bio-membranes negatively. In this review, we summarize the major effects of UV-B in the plant`s main molecules and physiological reactions, in addition to the possible defence mechanisms against UV-B including accumulating UV-B absorbing pigments to alleviate the harmful impact of UV-B.

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“…During the desiccation of L. ohadii , a decrease in the transcript levels of genes involved in light harvesting, photosynthetic metabolism, protein biosynthesis and cell division was detected [84]. Phormidium tenue responded to UV-B radiation reducing photosynthetic activity, while increasing the production of antioxidant enzymes, DNA damage repair systems, and UV-absorbing pigments to protect itself from the cell damage caused by the radiation [85]. Recently, Wadsworth et al [86] investigated the survival of Gloeocapsa sp.…”

Section: Stress Resistance and Resilience Of Sabsmentioning

confidence: 99%

The Ecology of Subaerial Biofilms in Dry and Inhospitable Terrestrial Environments

Villa

Cappitelli

2019

Microorganisms

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The ecological relationship between minerals and microorganisms arguably represents one of the most important associations in dry terrestrial environments, since it strongly influences major biochemical cycles and regulates the productivity and stability of the Earth’s food webs. Despite being inhospitable ecosystems, mineral substrata exposed to air harbor form complex and self-sustaining communities called subaerial biofilms (SABs). Using life on air-exposed minerals as a model and taking inspiration from the mechanisms of some microorganisms that have adapted to inhospitable conditions, we illustrate the ecology of SABs inhabiting natural and built environments. Finally, we advocate the need for the convergence between the experimental and theoretical approaches that might be used to characterize and simulate the development of SABs on mineral substrates and SABs’ broader impacts on the dry terrestrial environment.

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Cell damage caused by ultraviolet B radiation in the desert cyanobacterium Phormidium tenue and its recovery process

Cited by 20 publications

References 30 publications

Responses of Cyanobacterial Crusts and Microbial Communities to Extreme Environments of the Stratosphere

Responses of Cyanobacterial Crusts and Microbial Communities to Extreme Environments of the Stratosphere

Effects of Ultraviolet-B Radiation in Plant Physiology

The Ecology of Subaerial Biofilms in Dry and Inhospitable Terrestrial Environments

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