水产学报2011，Vol.35Issue(7)：1023-1029,7.DOI:10.3724/SP.J.1231.2011.17070
不同温度、光照强度和硝氮浓度下龙须菜对无机磷吸收的影响
Effects of temperature,irradiance level and nitrate concentration on the uptake of inorganic phosphorus in Gracilaria lemaneiformis(Rhodophyta)
摘要
Abstract
Gracilaria lemaneiformis(Bory) Weber-van Bosse is an economically important red seaweed that is cultivated on a large scale in China due to the quantity and quality of agar in its cell walls. This alga is also considered an excellent species for alleviating coastal eutrophication, which has become ever more serious in China. To aim at such a function of bioremediation, in this study, the characteristics of inorganic phosphorus (Pi) uptake in G. Lemaneiformis were investigated. Thalli were incubated in artificial seawater with f/2 enrichment and different Pi concentrations under different conditions of temperature (15, 23,31 t), irradiance levels[0,30,200 μmol photons/(m2 · s)]and nitrate concentrations(0,30,200 μmol/L),and the uptake dynamics of Pi were determined. The results showed that the uptake dynamic curve of Pi was always accordant with Michaelis-Menten equation under various conditions. The maximal uptake rate of Pi increased with the enhancements of temperature and nitrate concentration. However, the ratio of maximal uptake rate and half-saturation constant ( Vm/Ks), which represented the efficiency of Pi uptake, was the highest at the lowest temperature(15 t)and the level of nitrate concentration close to natural seawater(30 ji,mol/L). Both the maximal uptake rate and efficiency were higher at lower irradiance level [30 μmol photons/(m2 · s) ]than at higher level[200 μmol photons/(m2 · s) ]or dark[0 μmol photons/(m2· s) ]. It is concluded that environmental factors such as temperature, irradiance level and nitrate concentration, could significanty affect the Pi uptake in G. Lemaneiformis, and the mechanisms should be further studied in detail.关键词
龙须菜/无机磷/吸收动力学/温度/光照强度/硝氮Key words
Gracilaria lemaneiformis ( Rhodophyta )/ inorganic phosphorus/ uptake dynamics/temperature/ irradiance/ nitrate分类
农业科技引用本文复制引用
徐智广,邹定辉,高坤山,李美真..不同温度、光照强度和硝氮浓度下龙须菜对无机磷吸收的影响[J].水产学报,2011,35(7):1023-1029,7.基金项目
国家海洋公益性行业科研专项经费项目(20090519-2,200905020-2) （20090519-2,200905020-2）
山东省科技攻关计划(2009GG10005012) （2009GG10005012）
国家自然科学基金资助项目(No.41076094和30970450) （No.41076094和30970450）
教育部"新世纪优秀人才支持计划"项目(NCET-10-0375) （NCET-10-0375）
