Impact of Spectral Quality on Toxicity of Iron in Anabaena Doliolum and Chlorella Vulgaris.  

作　　者：NIRUPAMA MALLICK L. C. RAI 

机构地区：[1]Laboratory of Algal Biology, Centre of Advanced Study in Botany. Banaras Hindu University,Laboratory of Algal Biology, Centre of Advanced Study in Botany. Banaras Hindu University Varanasi-221005, India,Varanasi-221005, India

出　　处：《Biomedical and Environmental Sciences》1992年第1期65-75,共11页生物医学与环境科学（英文版）

摘　　要：Evidence is presented on the effects of low and high concentrations of iron on growth, nutrient uptake (NH4+and NO3-), photosynthesis (CO2-fixation and O2-evolution) and nitrate reductase (NR) activity of A. doliolum and C. vulgaris under monochromatic irradiation. Control cultures (not treated with FeCl3) showed maximum growth under fluorescent followed by red, yellow, blue and green lights (fluorescent > yellow > red > blue > green). The inhibition was of synergistic type under yellow and red lights at all the iron concentrations tested. However, under blue and green lights the interaction was less than additive type. All the processes studied responded in a similar manner to a particular color of light. Under fluorescent light at low Fe concentrations, stimulation of NR, 14CO2-fixation and O2-evolution was noticed in both the test organisms. However, even the lowest concentration of iron tested was inhibitory to these processes under yellow and red lights. Under blue light at 20 μg-ml-1 Fe, NR activity was inhibited by 98%. This study clearly demonstrates that metal toxicity to phytoplankton will be greatly affected by spectral quality, hence it will have great significance in limnological research.Evidence is presented on the effects of low and high concentrations of iron on growth, nutrient uptake (NH4+and NO3-), photosynthesis (CO2-fixation and O2-evolution) and nitrate reductase (NR) activity of A. doliolum and C. vulgaris under monochromatic irradiation. Control cultures (not treated with FeCl3) showed maximum growth under fluorescent followed by red, yellow, blue and green lights (fluorescent > yellow > red > blue > green). The inhibition was of synergistic type under yellow and red lights at all the iron concentrations tested. However, under blue and green lights the interaction was less than additive type. All the processes studied responded in a similar manner to a particular color of light. Under fluorescent light at low Fe concentrations, stimulation of NR, 14CO2-fixation and O2-evolution was noticed in both the test organisms. However, even the lowest concentration of iron tested was inhibitory to these processes under yellow and red lights. Under blue light at 20 μg-ml-1 Fe, NR activity was inhibited by 98%. This study clearly demonstrates that metal toxicity to phytoplankton will be greatly affected by spectral quality, hence it will have great significance in limnological research.

关 键 词：CHLORELLA ANABAENA photosynthesis yellow VULGARIS lights uptake PHOTOSYNTHETIC REDUCTASE irradiation 

分 类 号：X503.23[环境科学与工程—环境工程] X173