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Biochemical and uptake responses of the macroalga Gracilaria lemaneiformis under urea enrichment conditions

文献类型： 外文期刊

作者： Han, Tingting 1 ; Qi, Zhanhui 1 ; Huang, Honghui 1 ; Fu, Guiquan 1 ;

作者机构： 1.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Minist Agr, Guangdong Prov Key Lab Fishery Ecol Environm, Guangzhou 510300, Guangdong, Peoples R China; Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Minist Agr, Key Lab South China Sea Fishery Resources Exploit, Guangzhou 510300, Guangdong, Peoples R China

关键词： Gracilaria lemaneiformis; Urea; Uptake kinetics; Photosynthetic pigment; Soluble protein; Tissue total nitrogen

期刊名称：AQUATIC BOTANY （ 影响因子：2.473； 五年影响因子：2.417 ）

ISSN： 0304-3770

年卷期： 2017 年 136 卷

页码：

收录情况： SCI

摘要： Thallus growth, nutrient uptake characteristics, and biochemical composition of Gracilaria lemaneiformis cultured at different urea concentrations of 5,10, 25,50, 100, 200, and 400 mu M nitrogen (N) were analyzed. Urea uptake revealed two distinct patterns: a rate-unsaturated uptake kinetic for N-limited thalli and a rate-saturating uptake kinetic (V-max =27.46 +/- 1.24 mu mol N g(-1) DW h(-1) and K-s = 95.81 +/- 11.65 mu M N) for N-replete thalli. Urea uptake rate in both N-limited and N-replete G. lemaneiformis increased with elevated urea concentration, and was largely enhanced in N-limited thalli relative to N-replete thalli. The relationship between tissue total nitrogen (TN) content and growth rate was not always linear for G. lemaneiformis. There was a significant increase in tissue TN content from the control value of 0.93%->2.5% dry weight at high (>= 100 mu M N) urea concentrations, and the highest growth rate was detected at 100 mu M N. The content of photosynthetic pigments Chlorophyll a and Phycoerythrin increased with tissue TN up to 100 MN but decreased at higher urea concentrations. However, only minor differences in the content of soluble protein as a percentage of tissue TN were observed. The results of the present study indicate that urea uptake by G. lemaneiformis in the field where urea concentration is <25 mu M N) is directed towards increased growth and N storage. (C) 2016 Elsevier B.V. All rights reserved.

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