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Comparative studies on utilizing nitrogen capacity between two macroalgae Gracilaria tenuistipitata var. liui (rhodophyta) and Ulva pertusa (chlorophyta). I. Nitrogen storage under nitrogen enrichment and starvation


Comparative studies on utilizing nitrogen capacity between two macroalgae Gracilaria tenuistipitata var. liui (rhodophyta) and Ulva pertusa (chlorophyta). I. Nitrogen storage under nitrogen enrichment and starvation



Journal of Environmental Sciences 13(3): 318-322



ISSN/ISBN: 1001-0742

PMID: 11590763

This study was conducted to determine the qualitative and quantitative accumulation of N in Gracilaria tenuistipitata var. liui and Ulva pertusa under NH4- enrichment and assess the partitioning of tissue nitrogen among the various intracellular pools under conditions of high external nitrogen availability; to measure the growth rates of the macroalgae with N-sufficient and without external N supply; and to compare the effect of N-starvation on intracellular N pools and growth rates between the different morphological species. After 10 days of ammonium enrichment, ammonium NH4-, free amino acid (FAA), protein, chlorophyll, phycoerythrin and total dissolved nitrogen of the two macroalgae increased significantly. Total nitrogen increased significantly from 3.65% to 5.78% dry weight of G. tenuistipitata var. liui and 2.82% to 5.07% dry weight of U. pertusa. Protein and FAA were the most important N storage pools in the macroalgae. During N-starvation period, individual N pools of the two species were depleted at exponential rates. Each N pool in U. pertusa decreased more rapidly than in G. tenuistipitata var. liui and the latter was able to sustain fast growth for a longer time (>20 days) than U. pertusa. N demands for supporting growth were different between the two species, U. pertusagrew more rapidly and had higher N demands than G. tenuistipitata var. liui did.

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Accession: 003685845

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