IN VITRO IMPACT STUDY •N EFFECT ARTIFICIAL UV-B RADIATION OF (313NM) ON NET PHOTOSYNTHETIC RELEASE F OXYGEN AND CELL MULTIPLICATION HI MARINE DIATOM, COSCINODISCUS GIGAS ETHRENBERGA. Yogamoorthi
Increased concern on the biological effect of UV-B (280-340) in view of widening of Ozone layer in the stratosphere, is the field of focus in the recent past and in future. In vitro studies on the effect of artificial UV-B radiation (313nm) revealed that there is a I 0% reduction in the net photosynthetic 02 production in the diatom Coscinodiscus gigas when artificially irradiated under 4.8 w in UV dose for a period of one hour. It is also found out that further increase in the exposure period has not showed any proportional decrease in the net 02 production indicating that the diatom might be getting acclimation to the stress after one hour period. Such inference is also further justified by culturing the irradiated diatoms and counting the number of cells produced under different exposure period. The results obtained and the inferences arrived, are discussed in the light of previous reports. The usage of the word UV-inhibition instead of photo-inhibition, is also highlighted while describing the UV Â— induced changes in different components of any ecosystem.
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