Interactive effects of UV-B and heavy metals (Cu and Pb) on nitrogen and phosphorus metabolism of a N2-fixing cyanobacterium Anabaena doliolum

Rai, L.C.; Tyagi, B. S.; Rai, Padmaja; Mallick, Nirupama

doi:10.1016/s0098-8472(98)00011-2

Cited by 54 publications

(42 citation statements)

References 23 publications

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“…ROS increased the membrane permeability in G . lemaneiformis (Fig.5a), consistent with the fi ndings of previous reports (Häder et al, 1986;Rai et al, 1998;Sairam and Srivastava, 2002). This suggests that the cellular constituents that absorb UVBR are destroyed, and this in turn damages the proteins and glycolipids of the membranes.…”

Section: Fig3 Relative Electron Transport Rate (Retr) Of G Racilariasupporting

confidence: 90%

“…Low fl uences inactivate membrane functions such as transport systems, electrogenic pumps, and ATPase (Hollósy, 2002). The peroxidative damages are especially evident for membrane lipids (Rai et al, 1998). The data for ROS (Fig.6) and lipid peroxidation (Fig.5b) support the above-mentioned viewpoint.…”

Section: Fig3 Relative Electron Transport Rate (Retr) Of G Racilariasupporting

confidence: 67%

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Physiological responses of macroalga Gracilaria lemaneiformis (Rhodophyta) to UV-B radiation exposure

Zhu

Xiao

Wang

et al. 2014

Chin. J. Ocean. Limnol.

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This paper aims to evaluate the effects of ultraviolet-B radiation (UVBR) on Gracilaria lemaneiformis , a commercial red macroalga and an important source of agar. To study the in-vitro effect of UVBR on G . lemaneiformis , this plant was cultivated and exposed to photosynthetically active radiation (PAR) at 40 μmol photons/(m 2 •s) and enhanced UVBR (0, 0.36, 0.72, 1.08, 1.44, and 1.80 kJ/(m 2 •d)) for 13 days. The samples were processed for histochemical analysis, and the growth rate, photosynthetic pigment contents, photosynthetic performance, reactive oxygen species levels, membrane permeability, malonyl dialdehyde contents and antioxidant capacity of G . lemaneiformis were investigated. After 13 days of exposure to PAR+UVBR, G . lemaneiformis showed photodamage and photoinhibition of photosynthetic pigments (chlorophyll a and phycoerythrin), leading to a decreased photosynthetic effi ciency. Further, there was a corresponding decrease in the relative growth rates and depigmentation and partial necrosis of the apical segments were noted after exposure to PAR+UVBR. Additionally, UVBR induced excess production of superoxide radicals and hydrogen peroxide, eliciting a marked cellular membrane damage and antioxidative response.

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Section: Fig3 Relative Electron Transport Rate (Retr) Of G Racilariasupporting

confidence: 90%

Section: Fig3 Relative Electron Transport Rate (Retr) Of G Racilariasupporting

confidence: 67%

Physiological responses of macroalga Gracilaria lemaneiformis (Rhodophyta) to UV-B radiation exposure

Zhu

Xiao

Wang

et al. 2014

Chin. J. Ocean. Limnol.

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“…Abiotic stress, especially heavy metal stress affects the activity of GS, but the results are contradictory. Stimulation (Chaffei et al 2004;Jha & Dubey 2004), as well as inhibition (Chaffei et al 2004;Rai et al 1998;Ruiz et al 2007) of GS activity have been reported. Similarly, we observed different effect of silicon on maize root GS activity.…”

Section: Discussionmentioning

confidence: 96%

Silicon improves salinity tolerance and affects ammonia assimilation in maize roots

et al. 2014

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The present study was conducted to evaluate the effect of different salt concentrations (50 and 200 mM NaCl) on growth, permeability properties (electrolyte leakage, cell viability) and activity of glutamine synthetase (GS) and glutamate dehydrogenase (GDH) in roots of maize seedlings. Both salt concentrations significantly affected growth and permeability properties of maize seedling roots and this negative effect increased with concentration of salt and duration of experiments. On the other hand salinity induced only small changes in the activities of GS and GDH, usually small increase in the activity was observed. To characterise the possible protective effect of silicon (Si) on maize roots exposed to saline stress, different concentrations of Si were simultaneously applied to both, low (50 mM) and high (200 mM) salt concentrations. Possible protective effects of Si on studied parameters were analysed in time range of 3 days treatment with the most positive effect on salt-induced root growth inhibition at high salt concentration and electrolyte leakage. The results show significant increase in GDH activity under all the tested conditions, although the mechanisms underlying this increase have not been elucidated. The results indicate that silicon may ameliorate the salt-induced root growth inhibition and increase the plant vigour at stressful conditions.

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“…There is also evidence that UV-B radiation can affect cyanobacterial nitrogen fixation (Rai et al 1998). Cyanobacteria are especially prone to DNA damage by UV radiation because of the very short distance between the cell surface and genome and also because of limited filtration of enhanced UV-B by chemical protection (e.g.…”

Section: Introductionmentioning

confidence: 99%

The nitrogen fixation potential of arctic cryptogram species is influenced by enhanced UV-B radiation

Solheim

Johanson²,

Callaghan

et al. 2002

Oecologia

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Effects of enhanced UV-B (representing a 15% ozone depletion) on cyanobacterial nitrogen fixation were measured at a high arctic site (Adventdalen, 79°N, Svalbard) and a subarctic site (Abisko, 68°N, Sweden). Nitrogen fixation potential (acetylene reduction) by cyanobacteria associated with the moss Sanionia uncinata in vegetation exposed to experimentally enhanced levels of UV-B for 3 and 4 years in the high arctic in Adventdalen was reduced by 50% compared to controls after 3 years. No reduction in nitrogen fixation potential was observed in cyanobacteria associated with the moss Hylocomium splendens when previously exposed to enhanced UV-B in Abisko for a 7-year period. However, in the same experiment a 50% increase in summer precipitation stimulated nitrogen fixation potential by up to 6-fold above the natural precipitation treatments both in cyanobacteria associated with vegetation exposed to natural and enhanced UV-B radiation. In contrast to the lack of UV effect on moss-associated nitrogen fixation at the subarctic site, nitrogen fixation potential by the dominant lichen species Peltigera aphthosa was reduced by 50% when measured after 8 years exposure to elevated UV-B treatment. Evidence from these studies highlights the importance of UV-B radiation for cyanobacterial nitrogen fixation in the Arctic and future impact on nitrogen availability in such plant communities.

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Interactive effects of UV-B and heavy metals (Cu and Pb) on nitrogen and phosphorus metabolism of a N2-fixing cyanobacterium Anabaena doliolum

Cited by 54 publications

References 23 publications

Physiological responses of macroalga Gracilaria lemaneiformis (Rhodophyta) to UV-B radiation exposure

Physiological responses of macroalga Gracilaria lemaneiformis (Rhodophyta) to UV-B radiation exposure

Silicon improves salinity tolerance and affects ammonia assimilation in maize roots

The nitrogen fixation potential of arctic cryptogram species is influenced by enhanced UV-B radiation

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