VARIABILITY IN NITRATE UPTAKE KINETICS IN THALASSIOSIRA-PSEUDONANA (BACILLARIOPHYCEAE)

被引:30
作者
DORTCH, Q
THOMPSON, PA
HARRISON, PJ
机构
[1] UNIV BRITISH COLUMBIA,DEPT OCEANOG,VANCOUVER V6T 1W5,BC,CANADA
[2] UNIV BRITISH COLUMBIA,DEPT BOT,VANCOUVER V6T 1W5,BC,CANADA
关键词
KINETICS; NITRATE UPTAKE; N-LIMITATION; N SOURCE; THALASSIOSIRA-PSEUDONANA;
D O I
10.1111/j.0022-3646.1991.00035.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Short-term (1-9 min) nitrate uptake kinetics were measured in Thalassiosira pseudonana (Hust.) Hasle & Heimdal grown in nitrate-limited, ammonium-limited, and nitrate-sufficient continuous cultures. For all cultures, maximal nitrate uptake rates did not develop until approximately 3 min after nitrate addition; thereafter, nitrate uptake rates remained constant or declined slightly. The K(s) and V(max) for the nitrate-limited cultures were higher at any growth rate than those for the ammonium-limited or nitrate-sufficient cultures. Thus, much higher nitrate concentrations would be required to saturate nitrate uptake in nitrate-limited Thalassiosira pseudonana than is usually considered necessary. The lack of data for other species grown under a range of environmental conditions makes it difficult to generalize about the effect of preconditioning on nitrate uptake kinetics.
引用
收藏
页码:35 / 39
页数:5
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