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The effects of enhanced UV-B radiation was seen on growth, pigmentation, polyamines and some physiological processes of a nitrogen fixing cyanobacterium Nostoc muscorum. UV-B exposure of 90min having ...intensity of 3.5Wm^<-2> proved to be lethal for this alga. Amongst all the pigments, phycocyanin was most affected. Nitrate reductase activity was also decreased but not completely inhibited even after 60min of UV-B exposure. The test alga contains a higher amount of unusual polyamine homo-spermidine in comparison to other usual polyamines (putrescine, spermidine and spermine). Enhanced UV-B exposure decreased the nitrogenase activity vis a vis the homo-spermidine contents, showing a direct correlation between the enzyme nitrogenase and homo-spermidine. These results suggest that possibly homo-spermidine plays some specific role in the regulation of nitrogen-fixation in the cyanobacterium under investigation.続きを見る
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Mendeley出力
KJ00004506858