The involvement of the antioxidant system in protection of desert cyanobacterium Nostoc sp. against UV-B radiation and the effects of exogenous antioxidants

The combined effects of UV-B radiation and herbicides on photosynthesis, antioxidant enzymes and DNA damage in two bloom-forming cyanobacteria

“…These effects have been shown to be usually mediated by ROS generation (Chen et al, 2009). Excessive ROS production can destroy D1 protein, and affect photon absorption, electron transport and the PSII reaction center (Xia et al, 2004), thus inhibiting photosynthesis in the photosystem (Xiong, 2001), and finally destroying photosynthetic apparatus, enzymes and DNA Kumar et al, 2004;Wang et al, 2008). Our results also proved that increased UV-B caused ROS generation and MDA production, decreased SOD activity and destroyed DNA strands (Table 3).…”

Damage to DNA caused by UV-B radiation in the desert cyanobacterium Scytonema javanicum and the effects of exogenous chemicals on the process

“…There is increasing evidence that UV-B radiation affects normal metabolism in all organisms, especially desert cyanobacteria, which are exposed to high level UV radiation on desert soil surface Wang et al, 2008;Chen et al, 2009). In the present experiment, UV-B radiation also decreased photosynthesis activity, and the extent of damage varied with the intensity of radiation and duration of exposure (Fig.…”

“…SOD activity was measured by the method described by Wang et al (2008). In brief, cyanobacteria culture treated were ground to powder in liquid nitrogen and homogenized in ice-cold 0.1 M sodium phosphate buffer (pH 6.8).…”

Optimization and Production of Botryococcus braunii Biomass using Commercial Nutrients by Response Surface Methodology

“…Thus an efficient alternative source is a biofuel, of which microalgae is a promising feedstock for biofuel [2,3]. The beneficiary effects of microalgae as an energy source over other energy producing terrestrial plants are high photosynthetic efficiency, fast growth rate and high biomass production rate with the ability to fix 50 times high carbon dioxide [4]. Also the characteristic features of biofuel such as non-toxic, biodegradable and renewable nature were considered as a prime candidate for biofuel production [5].…”