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231224s2017 xx |||||o 00| ||eng c |
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|a 10.1093/jxb/erx074
|2 doi
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|a pubmed24n0901.xml
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|a (DE-627)NLM270577068
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|a (NLM)28369501
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|a DE-627
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|e rakwb
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|a eng
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|a Ruan, Zuoxi
|e verfasserin
|4 aut
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|a In Synechococcus sp. competition for energy between assimilation and acquisition of C and those of N only occurs when growth is light limited
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|c 2017
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 14.05.2018
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|a Date Revised 29.06.2018
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|a published: Print
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|a Citation Status MEDLINE
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|a © The Author 2017. Published by Oxford University Press on behalf of the Society for Experimental Biology. All rights reserved. For permissions, please email: journals.permissionsoup.com.
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|a The carbon-concentrating mechanisms (CCMs) of cyanobacteria counteract the low CO2 affinity and CO2:O2 selectivities of the Rubisco of these photolithotrophs and the relatively low oceanic CO2 availability. CCMs have a significant energy cost; if light is limiting, the use of N sources whose assimilation demands less energy could permit a greater investment of energy into CCMs and inorganic C (Ci) assimilation. To test this, we cultured Synechococcus sp. UTEX LB 2380 under either N or energy limitation, in the presence of NO3- or NH4+. When growth was energy-limited, NH4+-grown cells had a 1.2-fold higher growth rate, 1.3-fold higher dissolved inorganic carbon (DIC)-saturated photosynthetic rate, 19% higher linear electron transfer, 80% higher photosynthetic 1/K1/2(DIC), 2.0-fold greater slope of the linear part of the photosynthesis versus DIC curve, 3.5-fold larger intracellular Ci pool, and 2.3-fold higher Zn quota than NO3--grown cells. When energy was not limiting growth, there were not differences between NH4+- and NO3--grown cells, except for higher linear electron transfer and larger intracellular Ci pool.We conclude that, when energy limits growth, cells that use the cheaper N source divert energy from N assimilation to C acquisition and assimilation; this does not happen when energy is not limiting
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Ammonium
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|a CO2 concentrating mechanisms (CCMs)
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|a cyanobacteria
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|a internal carbon pool
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|a nitrate
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|a Ammonium Compounds
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|a Nitrates
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|a Carbon Dioxide
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|a 142M471B3J
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|a Nitrogen
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|a N762921K75
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|a Raven, John A
|e verfasserin
|4 aut
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|a Giordano, Mario
|e verfasserin
|4 aut
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|i Enthalten in
|t Journal of experimental botany
|d 1985
|g 68(2017), 14 vom: 01. Juni, Seite 3829-3839
|w (DE-627)NLM098182706
|x 1460-2431
|7 nnns
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|g volume:68
|g year:2017
|g number:14
|g day:01
|g month:06
|g pages:3829-3839
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|u http://dx.doi.org/10.1093/jxb/erx074
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