Elevated CO2 affects kelp nutrient quality: A case study of Saccharina japonica from CO2-enriched coastal mesocosm systems
文献类型： 外文期刊
作者： Zhang, Xiaowen 1 ; Xu, Dong 1 ; Han, Wentao 1 ; Wang, Yitao 1 ; Fan, Xiao 1 ; Loladze, Irakli 3 ; Gao, Guang 4 ; Zhang, Y 1 ;
作者机构： 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao 266071, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Funct Lab Marine Fisheries Sci & Food Prod Proc, Qingdao 266200, Peoples R China
3.Bryan Coll Hlth Sci, Bryan Med Ctr, Lincoln, NE 68506 USA
4.Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen 361005, Peoples R China
5.Huaihai Inst Technol, Jiangsu Key Lab Marine Bioresources & Environm, Lianyungang 222005, Peoples R China
6.Ludong Univ, Sch Life Sci, Yantai 264025, Peoples R China
关键词： elevated CO2; kelp; marine ecosystem; metabolite; nutrition
期刊名称：JOURNAL OF PHYCOLOGY （ 影响因子：2.923； 五年影响因子：3.091 ）
ISSN： 0022-3646
年卷期： 2021 年 57 卷 1 期
页码：
收录情况： SCI
摘要： Kelps provide critical services for coastal food chains and ecosystem, and they are important food source for some segments of human population. Despite their ecological importance, little is known about long-term impacts of elevated CO2 (eCO(2)) on nutrient metabolites in kelps and the underlying regulation mechanisms. In this study, the kelp Saccharina japonica was cultured in CO2-enriched coastal mesocosm systems for up to 3 months. We found that, although eCO(2) significantly increased the growth rate, carbon concentrations, and C/N ratio of S. japonica, and it had no effect on total nitrogen and protein contents at the end of cultivation period. Meanwhile, it decreased the lipid, magnesium, sodium, and calcium content and changed the amino acid and fatty acid composition. Combining the genome-wide transcriptomic and metabolic evidence, we obtained a system-level understanding of metabolic response of S. japonica to eCO(2). The unique ornithine-urea cycle (OUC) and aspartate-argininosuccinate shunt (AAS), coupled with TCA cycle, balanced the carbon and nitrogen metabolism under eCO(2) by providing carbon skeleton for amino acid synthesis and reduced power for nitrogen assimilation. This research provides a major advance in the understanding of kelp nutrient metabolic mechanism in the context of global climate change, and such CO2-induced shifts in nutritional value may induce changes in the structure and stability of marine trophic webs and affect the quality of human nutrition resources.
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