The nitrogen costs of photosynthesis in a diatom under current and future pCO(2)
Li, Gang1; Brown, Christopher M.1; Jeans, Jennifer A.1; Donaher, Natalie A.1; McCarthy, Avery1; Campbell, Douglas A.1; dcampbell@mta.ca
2015
发表期刊NEW PHYTOLOGIST
卷号205期号:2页码:533-543
摘要With each cellular generation, oxygenic photoautotrophs must accumulate abundant protein complexes that mediate light capture, photosynthetic electron transport and carbon fixation. In addition to this net synthesis, oxygenic photoautotrophs must counter the light-dependent photoinactivation of Photosystem II (PSII), using metabolically expensive proteolysis, disassembly, resynthesis and re-assembly of protein subunits. We used growth rates, elemental analyses and protein quantitations to estimate the nitrogen (N) metabolism costs to both accumulate the photosynthetic system and to maintain PSII function in the diatom Thalassiosira pseudonana, growing at two pCO(2) levels across a range of light levels. The photosynthetic system contains c. 15-25% of total cellular N. Under low growth light, N (re)cycling through PSII repair is only c. 1% of the cellular N assimilation rate. As growth light increases to inhibitory levels, N metabolite cycling through PSII repair increases to c. 14% of the cellular N assimilation rate. Cells growing under the assumed future 750 ppmv pCO(2) show higher growth rates under optimal light, coinciding with a lowered N metabolic cost to maintain photosynthesis, but then suffer greater photoinhibition of growth under excess light, coincident with rising costs to maintain photosynthesis. We predict this quantitative trait response to light will vary across taxa.
部门归属LMB
关键词Diatom Growth Nitrogen Metabolism Ocean Acidification Photosynthesis Photosystem Ii (psIi) Rubisco Thalassiosira
学科领域Plant Sciences
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文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/14905
专题中科院海洋生物资源可持续利用重点实验室
通讯作者dcampbell@mta.ca
作者单位1.[Li, Gang
2.Jeans, Jennifer A.
3.Donaher, Natalie A.
4.McCarthy, Avery
5.Campbell, Douglas A.] Mt Allison Univ, Dept Chem & Biochem, Sackville, NB E4L 1G7, Canada
6.[Li, Gang] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Trop Marine Bioresources & Ecol, Guangzhou 510301, Peoples R China
7.[Brown, Christopher M.] Environm Prote NB, Sackville, NB E4L 3M7, Canada
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Li, Gang,Brown, Christopher M.,Jeans, Jennifer A.,et al. The nitrogen costs of photosynthesis in a diatom under current and future pCO(2)[J]. NEW PHYTOLOGIST,2015,205(2):533-543.
APA Li, Gang.,Brown, Christopher M..,Jeans, Jennifer A..,Donaher, Natalie A..,McCarthy, Avery.,...&dcampbell@mta.ca.(2015).The nitrogen costs of photosynthesis in a diatom under current and future pCO(2).NEW PHYTOLOGIST,205(2),533-543.
MLA Li, Gang,et al."The nitrogen costs of photosynthesis in a diatom under current and future pCO(2)".NEW PHYTOLOGIST 205.2(2015):533-543.
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