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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;
Source PublicationNEW PHYTOLOGIST
AbstractWith 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.
KeywordDiatom Growth Nitrogen Metabolism Ocean Acidification Photosynthesis Photosystem Ii (psIi) Rubisco Thalassiosira
Subject AreaPlant Sciences
Document Type期刊论文
Affiliation1.[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
Recommended Citation
GB/T 7714
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.,...& 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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