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ID 30149
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title alternative
Effects of temperature on the uptake kinetics of ammonia-N and nitrate-N by Porphyra yezoensis thalli.
creator
Takao, Masahide
subject
ammonia
nitrate
Porphyra
temperature
uptake
NDC
Botany
abstract
The uptake kinetics for ammonia-N and nitrate-N by Porphyra yezoensis thalli were examined under various temperatures (4-18°C). The carbon and nitrogen contents of the frond were 341.9±24.8 and 52.5±10.4 mg•g dry wt-1, respectively, and the C/N ratio was 6.80±1.58. The uptake parameter, Ks, for ammonia-N varied from 48.3 to 182.7 µgN•l-1, and Vm was from 0.0033 to 0.0082 h-1. The Ks for nitrate-N varied from 10.1 to 53.9 µgN•l-1, and the Vm was from 0.0005 to 0.0013 h-1. These parameters both for ammonia-N and nitrate-N showed the maxima at 14°C. Comparing the Vm of ammonia-N with that of nitrate-N under the same temperature, ammonia-N was taken 6.3-9.4 times faster than nitrate-N by the frond. These parameters expressed in common logarithms were converted by the quadratic equations to absolute temperatures; for ammonia-N, VA=S × 10-29.642(103/T)2+206.93(103/T)-363.23/(S+10-39.556(103/T)2+ 276.17(103/ T)-479.77) and for nitrate-N, VN = S × 10-32.464(103/T)2+227.45(103/T)-401.36/(S+10-37.051(103/T)2+257.50(103/T)-445.69). These equations consisting of the major factors such as ammonia-N and nitrate-N concentrations and temperature which are controlling the growth of Nori frond are considered to be useful in estimating the production capacity of Nori cultural ground.
journal title
藻類
volume
Volume 36
issue
Issue 1
start page
37
end page
42
date of issued
1988-03-10
publisher
日本藻類学会
issn
0038-1578
ncid
language
jpn
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
department
Graduate School of Biosphere Science