New insights into the covariation of stomatal, mesophyll and hydraulic conductances from optimization models incorporating nonstomatal limitations to photosynthesis.
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| Title: | New insights into the covariation of stomatal, mesophyll and hydraulic conductances from optimization models incorporating nonstomatal limitations to photosynthesis. |
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| Authors: | Dewar, Roderick1 roderick.dewar@anu.edu.au, Mauranen, Aleksanteri2, Mäkelä, Annikki3, Hölttä, Teemu3, Medlyn, Belinda4, Vesala, Timo2,3 |
| Source: | New Phytologist. Jan2018, Vol. 217 Issue 2, p571-585. 15p. |
| Subjects: | Stomata, Photosynthesis, Carboxylation, Effect of drought on plants, Mesophyll tissue |
| Abstract: | * Optimization models of stomatal conductance (gs) attempt to explain observed stomatal behaviour in terms of cost--benefit tradeoffs. While the benefit of stomatal opening through increased CO2 uptake is clear, currently the nature of the associated cost(s) remains unclear. We explored the hypothesis that gs maximizes leaf photosynthesis, where the cost of stomatal opening arises from nonstomatal reductions in photosynthesis induced by leaf water stress. * We analytically solved two cases, CAP and MES, in which reduced leaf water potential leads to reductions in carboxylation capacity (CAP) and mesophyll conductance (gm) (MES). * Both CAP and MES predict the same one-parameter relationship between the intercellular : atmospheric CO2 concentration ratio (ci/ca) and vapour pressure deficit (VPD, D), viz. ci/ca ≈ ξ/(ξ + √D), as that obtained from previous optimization models, with the novel feature that the parameter ξ is determined unambiguously as a function of a small number of photosynthetic and hydraulic variables. These include soil-to-leaf hydraulic conductance, implying a stomatal closure response to drought. MES also predicts that gs/gm is closely related to ci/ca and is similarly conservative. * These results are consistent with observations, give rise to new testable predictions, and offer new insights into the covariation of stomatal, mesophyll and hydraulic conductances. [ABSTRACT FROM AUTHOR] |
| Copyright of New Phytologist is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: New insights into the covariation of stomatal, mesophyll and hydraulic conductances from optimization models incorporating nonstomatal limitations to photosynthesis. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Dewar%2C+Roderick%22">Dewar, Roderick</searchLink><relatesTo>1</relatesTo><i> roderick.dewar@anu.edu.au</i><br /><searchLink fieldCode="AR" term="%22Mauranen%2C+Aleksanteri%22">Mauranen, Aleksanteri</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Mäkelä%2C+Annikki%22">Mäkelä, Annikki</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Hölttä%2C+Teemu%22">Hölttä, Teemu</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Medlyn%2C+Belinda%22">Medlyn, Belinda</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Vesala%2C+Timo%22">Vesala, Timo</searchLink><relatesTo>2,3</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22New+Phytologist%22">New Phytologist</searchLink>. Jan2018, Vol. 217 Issue 2, p571-585. 15p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Stomata%22">Stomata</searchLink><br /><searchLink fieldCode="DE" term="%22Photosynthesis%22">Photosynthesis</searchLink><br /><searchLink fieldCode="DE" term="%22Carboxylation%22">Carboxylation</searchLink><br /><searchLink fieldCode="DE" term="%22Effect+of+drought+on+plants%22">Effect of drought on plants</searchLink><br /><searchLink fieldCode="DE" term="%22Mesophyll+tissue%22">Mesophyll tissue</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: * Optimization models of stomatal conductance (gs) attempt to explain observed stomatal behaviour in terms of cost--benefit tradeoffs. While the benefit of stomatal opening through increased CO2 uptake is clear, currently the nature of the associated cost(s) remains unclear. We explored the hypothesis that gs maximizes leaf photosynthesis, where the cost of stomatal opening arises from nonstomatal reductions in photosynthesis induced by leaf water stress. * We analytically solved two cases, CAP and MES, in which reduced leaf water potential leads to reductions in carboxylation capacity (CAP) and mesophyll conductance (gm) (MES). * Both CAP and MES predict the same one-parameter relationship between the intercellular : atmospheric CO2 concentration ratio (ci/ca) and vapour pressure deficit (VPD, D), viz. ci/ca ≈ ξ/(ξ + √D), as that obtained from previous optimization models, with the novel feature that the parameter ξ is determined unambiguously as a function of a small number of photosynthetic and hydraulic variables. These include soil-to-leaf hydraulic conductance, implying a stomatal closure response to drought. MES also predicts that gs/gm is closely related to ci/ca and is similarly conservative. * These results are consistent with observations, give rise to new testable predictions, and offer new insights into the covariation of stomatal, mesophyll and hydraulic conductances. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of New Phytologist is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1111/nph.14848 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 15 StartPage: 571 Subjects: – SubjectFull: Stomata Type: general – SubjectFull: Photosynthesis Type: general – SubjectFull: Carboxylation Type: general – SubjectFull: Effect of drought on plants Type: general – SubjectFull: Mesophyll tissue Type: general Titles: – TitleFull: New insights into the covariation of stomatal, mesophyll and hydraulic conductances from optimization models incorporating nonstomatal limitations to photosynthesis. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Dewar, Roderick – PersonEntity: Name: NameFull: Mauranen, Aleksanteri – PersonEntity: Name: NameFull: Mäkelä, Annikki – PersonEntity: Name: NameFull: Hölttä, Teemu – PersonEntity: Name: NameFull: Medlyn, Belinda – PersonEntity: Name: NameFull: Vesala, Timo IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 01 Text: Jan2018 Type: published Y: 2018 Identifiers: – Type: issn-print Value: 0028646X Numbering: – Type: volume Value: 217 – Type: issue Value: 2 Titles: – TitleFull: New Phytologist Type: main |
| ResultId | 1 |
