Nitrogen uptake and growth responses of seedlings of the brown seaweed Sargassum hemiphyllum under controlled culture conditions

文献类型： 外文期刊

第一作者： Han, Tingting

作者： Han, Tingting;Qi, Zhanhui;Huang, Honghui;Liao, Xiuli;Zhang, Wenwen;Han, Tingting;Qi, Zhanhui;Huang, Honghui;Liao, Xiuli;Zhang, Wenwen

作者机构：

关键词： Sargassum hemiphyllum; Phaeophyceae; N source; Nuptake; Growth; Tissue N content

期刊名称：JOURNAL OF APPLIED PHYCOLOGY （ 影响因子：3.215； 五年影响因子：3.612 ）

ISSN： 0921-8971

年卷期： 2018 年 30 卷 1 期

页码：

收录情况： SCI

摘要： For the purpose of indoor mass culture of seedlings of Sargassum hemiphyllum during spring and summer, a series of experiments were designed to evaluate nitrogen (N) uptake, growth performance, and N accumulation of seedlings. Transient uptake rates by N-limited seedlings for nitrate (NO3 (-)), ammonium (NH4 (+)), and urea were more rapid than uptake rates by N-replete seedlings. NO3 (-) uptake revealed a rate-saturating uptake kinetic for both N-limited and N-replete seedlings. Uptake rates of NH4 (+) and urea for N-limited seedlings were linear, whereas the N-replete seedlings displayed Michaelis-Menten curves. The slope of the linear models or equivalently affinity calculated from Michaelis-Menten curves was highest for NH4 (+) and lowest for urea, indicating that seedlings were more efficient at taking up NH4 (+). Tissue N content in seedling increased with increasing N concentrations, with the highest values with all three N sources at 150 mu M. The N requirement to support maximum growth varied 2.2-fold from 0.39 +/- 0.15% dry weight (DW) in NH4 (+) to 0.84 +/- 0.09% DW in NO3 (-), and hence, seedlings became more easily N limited at low NO3 (-) availability. The results showed that seedlings cultured in NO3 (-) enrichment (50-100 mu M) may be better able to meet their maximum growth than at high NH4 (+) availability, although seedlings have higher NH4 (+) uptake capacities.

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