Exploring optimal stomatal control under alternative hypotheses for the regulation of plant sources and sinks.
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| Title: | Exploring optimal stomatal control under alternative hypotheses for the regulation of plant sources and sinks. |
|---|---|
| Authors: | Dewar, Roderick1,2 (AUTHOR) roderick.dewar@helsinki.fi, Hölttä, Teemu3 (AUTHOR), Salmon, Yann1,3 (AUTHOR) |
| Source: | New Phytologist. Jan2022, Vol. 233 Issue 2, p639-654. 16p. |
| Subjects: | Stomata, European aspen, European white birch, Norway spruce, Turgor |
| Abstract: | Summary: Experimental evidence that nonstomatal limitations to photosynthesis (NSLs) correlate with leaf sugar and/or leaf water status suggests the possibility that stomata adjust to maximise photosynthesis through a trade‐off between leaf CO2 supply and NSLs, potentially involving source–sink interactions. However, the mechanisms regulating NSLs and sink strength, as well as their implications for stomatal control, remain uncertain.We used an analytically solvable model to explore optimal stomatal control under alternative hypotheses for source and sink regulation. We assumed that either leaf sugar concentration or leaf water potential regulates NSLs, and that either phloem turgor pressure or phloem sugar concentration regulates sink phloem unloading.All hypotheses led to realistic stomatal responses to light, CO2 and air humidity, including conservative behaviour for the intercellular‐to‐atmospheric CO2 concentration ratio. Sugar‐regulated and water‐regulated NSLs are distinguished by the presence/absence of a stomatal closure response to changing sink strength. Turgor‐regulated and sugar‐regulated phloem unloading are distinguished by the presence/absence of stomatal closure under drought and avoidance/occurrence of negative phloem turgor. Results from girdling and drought experiments on Pinus sylvestris, Betula pendula, Populus tremula and Picea abies saplings are consistent with optimal stomatal control under sugar‐regulated NSLs and turgor‐regulated unloading.Our analytical results provide a simple representation of stomatal responses to above‐ground and below‐ground environmental factors and sink activity. [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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| Header | DbId: egs DbLabel: Engineering Source An: 154222003 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Exploring optimal stomatal control under alternative hypotheses for the regulation of plant sources and sinks. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Dewar%2C+Roderick%22">Dewar, Roderick</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> roderick.dewar@helsinki.fi</i><br /><searchLink fieldCode="AR" term="%22Hölttä%2C+Teemu%22">Hölttä, Teemu</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Salmon%2C+Yann%22">Salmon, Yann</searchLink><relatesTo>1,3</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22New+Phytologist%22">New Phytologist</searchLink>. Jan2022, Vol. 233 Issue 2, p639-654. 16p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Stomata%22">Stomata</searchLink><br /><searchLink fieldCode="DE" term="%22European+aspen%22">European aspen</searchLink><br /><searchLink fieldCode="DE" term="%22European+white+birch%22">European white birch</searchLink><br /><searchLink fieldCode="DE" term="%22Norway+spruce%22">Norway spruce</searchLink><br /><searchLink fieldCode="DE" term="%22Turgor%22">Turgor</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Summary: Experimental evidence that nonstomatal limitations to photosynthesis (NSLs) correlate with leaf sugar and/or leaf water status suggests the possibility that stomata adjust to maximise photosynthesis through a trade‐off between leaf CO2 supply and NSLs, potentially involving source–sink interactions. However, the mechanisms regulating NSLs and sink strength, as well as their implications for stomatal control, remain uncertain.We used an analytically solvable model to explore optimal stomatal control under alternative hypotheses for source and sink regulation. We assumed that either leaf sugar concentration or leaf water potential regulates NSLs, and that either phloem turgor pressure or phloem sugar concentration regulates sink phloem unloading.All hypotheses led to realistic stomatal responses to light, CO2 and air humidity, including conservative behaviour for the intercellular‐to‐atmospheric CO2 concentration ratio. Sugar‐regulated and water‐regulated NSLs are distinguished by the presence/absence of a stomatal closure response to changing sink strength. Turgor‐regulated and sugar‐regulated phloem unloading are distinguished by the presence/absence of stomatal closure under drought and avoidance/occurrence of negative phloem turgor. Results from girdling and drought experiments on Pinus sylvestris, Betula pendula, Populus tremula and Picea abies saplings are consistent with optimal stomatal control under sugar‐regulated NSLs and turgor‐regulated unloading.Our analytical results provide a simple representation of stomatal responses to above‐ground and below‐ground environmental factors and sink activity. [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.17795 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 16 StartPage: 639 Subjects: – SubjectFull: Stomata Type: general – SubjectFull: European aspen Type: general – SubjectFull: European white birch Type: general – SubjectFull: Norway spruce Type: general – SubjectFull: Turgor Type: general Titles: – TitleFull: Exploring optimal stomatal control under alternative hypotheses for the regulation of plant sources and sinks. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Dewar, Roderick – PersonEntity: Name: NameFull: Hölttä, Teemu – PersonEntity: Name: NameFull: Salmon, Yann IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 01 Text: Jan2022 Type: published Y: 2022 Identifiers: – Type: issn-print Value: 0028646X Numbering: – Type: volume Value: 233 – Type: issue Value: 2 Titles: – TitleFull: New Phytologist Type: main |
| ResultId | 1 |
