dc.contributor.author |
Bellasio, Chandra
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dc.contributor.author |
Quirk, Joe
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dc.contributor.author |
Beerling, David J.
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dc.date.accessioned |
2020-05-07T06:28:27Z |
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dc.date.available |
2020-05-07T06:28:27Z |
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dc.identifier.uri |
http://hdl.handle.net/11201/152267 |
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dc.description.abstract |
[eng] By the end of the century, atmospheric CO2 concentration ([CO2]a) could reach 800 ppm, having risen from ∼200 ppm ∼24 Myr ago. Carbon dioxide enters plant leaves through stomata that limit CO2 diffusion and assimilation, imposing stomatal limitation (LS). Other factors limiting assimilation are collectively called non-stomatal limitations (LNS). C4 photosynthesis concentrates CO2 around Rubisco, typically reducing LS. C4-dominated savanna grasslands expanded under low [CO2]a and are metastable ecosystems where the response of trees and C4 grasses to rising [CO2]a will determine shifting vegetation patterns. How LS and LNS differ between savanna trees and C4 grasses under different [CO2]a will govern the responses of CO2 fixation and plant cover to [CO2]a - but quantitative comparisons are lacking. We measured assimilation, within soil wetting-drying cycles, of three C3 trees and three C4 grasses grown at 200, 400 or 800 ppm [CO2]a. Using assimilation-response curves, we resolved LS and LNS and show that rising [CO2]a alleviated LS, particularly for the C3 trees, but LNS was unaffected and remained substantially higher for the grasses across all [CO2]a treatments. Because LNS incurs higher metabolic costs and recovery compared with LS, our findings indicate that C4 grasses will be comparatively disadvantaged as [CO2]a rises. |
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dc.format |
application/pdf |
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dc.relation.isformatof |
Versió postprint del document publicat a: https://doi.org/10.1016/j.plantsci.2018.05.028 |
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dc.relation.ispartof |
Plant Science, 2018, vol. 274, p. 181-192 |
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dc.subject.classification |
57 - Biologia |
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dc.subject.other |
57 - Biological sciences in general |
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dc.title |
Stomatal and non-stomatal limitations in savanna trees and C4 grasses grown at low, ambient and high atmospheric CO2 |
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dc.type |
info:eu-repo/semantics/article |
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dc.type |
info:eu-repo/semantics/acceptedVersion |
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dc.date.updated |
2020-05-07T06:28:28Z |
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dc.rights.accessRights |
info:eu-repo/semantics/openAccess |
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dc.identifier.doi |
https://doi.org/10.1016/j.plantsci.2018.05.028 |
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