title: 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.
abstract: This paper deals with the N storage of Gracilaria tenuistipitata var. liui and Ulva pertusa under ammonium enrichment and starvation. After 10 days of ammonium enrichment, ammonium NH4+, free amino acid (FAA), protein (pro), chlorophyll (Chl), phycoerythrin (PE) and total dissolved nitrogen (TDN) of the two macroalgae increased significantly. Total nitrogen (TN) increased significantly from 3.65% to 5.78% dry weight of G. tenuistipitata var. liui and 2.82% to 5.07% dw of U. pertusa, respectively. 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 more time (> 20 days) than U. pertusa. N demands for supporting growth were different between the two species, U. pertusa grew more rapidly and had higher N demands than G. tenuistipitata var. liui did.
authors.affiliation: Aquaculture Research Laboratory, Ocean University of Qingdao, Qingdao 266003, China. Liujw@lib.ouqd.edu.cn
authors.forename: J W
authors.initials: JW
authors.lastname: Liu
authors.forename: S L
authors.initials: SL
authors.lastname: Dong
mesh_terms: D000596:Amino Acids / Q000378:metabolism; D000460:Chlorophyta / Q000254:growth & development / Q000378:metabolism*; D007700:Kinetics; D009584:Nitrogen / Q000378:metabolism*; D010940:Plant Proteins / Q000378:metabolism; D000644:Quaternary Ammonium Compounds / Q000378:metabolism*; D012044:Regression Analysis; D000461:Rhodophyta / Q000254:growth & development / Q000378:metabolism*; D013045:Species Specificity
chemical_list: D000596:Amino Acids; D010940:Plant Proteins; D000644:Quaternary Ammonium Compounds; D009584:Nitrogen