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- W2098031488 abstract "Growth, heterocyst differentiation, nitrogenase activity and glutamate uptake were studied in the cyanobiont Nostoc ANTH, a free-living isolate of the liverwort Anthoceros punctatus. Nostoc ANTH grew well in N2-medium and produced heterocyst and nitrogenase activity whereas NO- and NH-grown cultures did not show heterocyst differentiation and nitrogenase activity. Also, glutamate inhibited the diazotrophic growth, heterocyst differentiation and nitrogenase activity. However, the availability of NO and NH to the glutamate-medium resulted in the recovery of growth. NO- and NH-grown cells showed reduced levels of glutamate uptake which further reduced by the supplementation of NO- and NH in the reaction mixture during experimentation. These results suggest that in Nostoc ANTH glutamate acts as an inhibitor of heterocyst differentiation and nitrogenase activity rather than as a nitrogen source and that availability of NO- and NH alleviates the glutamate toxicity by inhibiting its uptake. This glutamate toxicity may be the reason for the localization of glutamate forming enzyme, glutamate synthase (GOGAT) within vegetative cells and not within heterocysts." @default.
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- W2098031488 date "1993-01-01" @default.
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- W2098031488 title "Regulation of glutamate metabolism in the cyanobiontNostoc ANTH by nitrogen sources" @default.
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- W2098031488 doi "https://doi.org/10.1002/jobm.3620330109" @default.
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