Ultraviolet-B exposure induces photo-oxidative damage and subsequent repair strategies in a desert cyanobacterium Microcoleus vaginatus Gom.

Xie, Zuoming; Wang, Yanxin; Liu, Yongding; Liu, Yongmei

doi:10.1016/j.ejsobi.2009.04.003

Cited by 58 publications

(31 citation statements)

References 32 publications

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“…In the previous studies, it has been demonstrated that the M. vaginatus could adapt to a variety of stress conditions, including drought, salinity and so on [8,9,22,23,45]. In the present work, we further know the man-made crusts constructed with M. vaginatus also could adapt the drought and salt stress to a certain extent.…”

Section: The Response Of Cyanobacterial Crusts To Stressessupporting

confidence: 51%

“…The isolated M. vaginatus was first cultured in BG-11 medium in a greenhouse (25 AE 2 C) [45] ), they were treated with drought or salt as described in Table 1. Three replicates for each treatment were made and the sampling was conducted after 1, 8, 15 and 30 d. For the drought treated groups, the Petri-dishes were directly evaporated to dryness as soon as possible.…”

Section: Inoculation and Treatment Of Man-made Cyanobacterial Crustsmentioning

confidence: 99%

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Effects of drought and salt stresses on man-made cyanobacterial crusts

Lan

Zhang

et al. 2010

European Journal of Soil Biology

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Section: The Response Of Cyanobacterial Crusts To Stressessupporting

confidence: 51%

Section: Inoculation and Treatment Of Man-made Cyanobacterial Crustsmentioning

confidence: 99%

Effects of drought and salt stresses on man-made cyanobacterial crusts

Lan

Zhang

et al. 2010

European Journal of Soil Biology

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“…POD, SOD, and CAT are important antioxidative enzymes to protect cells from the damage induced by free radicals when cells are exposed to oxidative stress (Hashempour et al 2014;Sharma et al 2012). For example, cyanobacterial crusts can improve their antioxidant abilities (increase SOD, POD, and CAT) to alleviate oxidative injury from UV-B radiation (Xie et al 2009). Conversely, antioxidative enzyme activity in moss crusts may decrease in response to UV-B radiation, resulting in the antioxidative enzyme system becoming disordered (Hui et al 2012).…”

Section: Changes In Antioxidative Enzyme Activity In Response To N Admentioning

confidence: 98%

Divergence in physiological responses between cyanobacterial and lichen crusts to a gradient of simulated nitrogen deposition

2015

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Background and aims Nitrogen (N) deposition in arid lands is known to be increasing. However, N deposition gradients have unclear effects on physiological characteristics of biocrusts. This study tested if physiological characteristics are stimulated by low levels of N deposition and reduced by high levels of N deposition. Methods We simulated N deposition at various rates to plots of cyanobacterial and lichen biocrusts in the Gurbantunggut Desert and measured indicators of growth and stress. Results In cyanobacterial crusts, most evidence suggests that biomass and growth are unaffected by lower levels of N but suppressed at the highest level. Biomass and growth of lichen crusts were less sensitive to N addition but, in the case of actual photochemical efficiency, were also suppressed at the highest N addition rate. Most osmotic adjustment substances of cyanobacterial and lichen crusts did not show significant responses after N addition. In the two crusts, minor increase in antioxidative enzyme activity was found in some N addition rates but no similar trends between the crust types were observed. Conclusions Physiological performance of cyanobacterial crusts was more sensitive to high levels of N addition than that of lichen crusts. Increasing N deposition might greatly affect cyanobacterial crusts before lichen crusts.

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“…ROS is produced in cells exposed to environmental stresses such as metals, UV-radiation, high light intensities, drought, salt, heat and freezing (Xie et al 2009b). The high level of ROS is potentially harmful to the normal metabolism and results in oxidative injury including lipid peroxidation, protein degradation, as well as DNA damage (He and Häder 2002;Jordan 1996).…”

Section: Effect Of Arsenic On Sod and Tbarsmentioning

confidence: 99%

“…Hence, the induction of antioxidant enzymes like SOD is an important protective mechanism to minimize cell oxidative damage in environmental stresses (Okamoto and Colepicolo 1998). Since SOD is one of the key enzymes to eliminate active oxygen (Kong and Sang 1999), and SOD as important antioxidant enzyme was found in almost all organisms, SOD has been regarded as a probe of oxidative stress in many studies (Davidson and Pearson 1996;Okamoto and Colepicolo 1998;Perl-Treves and Galun 1991;Tsang et al 1991;Xie et al 2009b). The results in this experiments also showed that arsenic resulted in the significant increase of SOD activities compared with the control (p \ 0.05), and SOD activities enhanced with the increment of concentrations and toxicity of arsenic.…”

Section: Effect Of Arsenic On Sod and Tbarsmentioning

confidence: 99%

Response of growth and superoxide dismutase to enhanced arsenic in two Bacillus species

et al. 2014

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Species differences in inorganic arsenic tolerance were investigated by comparing the responses of Bacillus subtilis (B. subtilis) and Bacillus thuringiensis (B. thuringiensis) to elevated concentrations of As(III) and As(V). The cell densities in treatments were always lower during the experiment compared to controls, with the exception of exposure to 1.0 mg As(V) l(-1) on the first day. It was also found that relative growth rate (RGR) of B. thuringiensis was lower than that of B. subtilis. Furthermore, RGR of each Bacillus species was negative correlation with toxicity of inorganic arsenic. However, total cell number still increased in each treatment according to cell density and RGR assays. Superoxide dismutase (SOD) activity of both Bacillus species was promoted by As(III) and As(V), especially under high arsenic concentration condition. In addition, SOD activity of B. thuringiensis was higher than that of B. subtilis during the same exposure time. In lipid peroxidation assay, thiobarbituric acid-reactive substances (TBARS) content of each Bacillus species had a significant increase with increment of arsenic concentration. Moreover, significant difference was observed between the two Bacillus species under high arsenic concentration. TBARS content of B. thuringiensis was higher than that of B. subtilis, indicating that effect of arsenic on cell membranes of B. thuringiensis was much more than that of B. subtilis. These results suggest that the two Bacillus species could adapt and live in high arsenic aquifers, although their growth and cell membranes were affected by As treatment in a way.

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Ultraviolet-B exposure induces photo-oxidative damage and subsequent repair strategies in a desert cyanobacterium Microcoleus vaginatus Gom.

Cited by 58 publications

References 32 publications

Effects of drought and salt stresses on man-made cyanobacterial crusts

Effects of drought and salt stresses on man-made cyanobacterial crusts

Divergence in physiological responses between cyanobacterial and lichen crusts to a gradient of simulated nitrogen deposition

Response of growth and superoxide dismutase to enhanced arsenic in two Bacillus species

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