Topographic Controls on Stomatal and Mesophyll Limitations to Photosynthesis in Two Subalpine Conifers.
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| Title: | Topographic Controls on Stomatal and Mesophyll Limitations to Photosynthesis in Two Subalpine Conifers. |
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| Authors: | Guo, Jiemin1 (AUTHOR) jiemin2014@gmail.com, Beverly, Daniel P.1 (AUTHOR), Mercer, Jason J.1 (AUTHOR), Cook, Craig S.2 (AUTHOR), Ewers, Brent E.1 (AUTHOR), Williams, David G.1,3 (AUTHOR) |
| Source: | International Journal of Plant Sciences. Mar/Apr2022, Vol. 183 Issue 3, p205-219. 15p. |
| Subject Terms: | *Plant-water relationships, *Water efficiency, *Photosynthesis, *Soil moisture, Stomata, Lodgepole pine, Conifers, Leaf physiology |
| Geographic Terms: | Rocky Mountains |
| Abstract: | Premise of research. Leaf stomatal and mesophyll conductances limit photosynthesis and influence water use efficiency. Few studies have quantified the relative limitations imposed by these CO2 diffusion pathways on photosynthesis in mature conifer trees under natural conditions. Here, we report observations of stomatal and mesophyll conductance changes during seasonal drying across contrasting topographic positions in two Rocky Mountain conifers. We predicted that topographic controls on soil water availability and energy balance would determine limitations to photosynthesis by mesophyll conductance across conifer species with contrasting patterns of stomatal and hydraulic traits. Methodology. Concurrent measurements of leaf gas exchange and carbon isotope discrimination were used to estimate stomatal (g s) and mesophyll (g m) conductance in branches of an isohydric species, lodgepole pine (Pinus contorta), and an anisohydric species, Engelmann spruce (Picea engelmannii), in the central Rocky Mountains. Quantitative limitation analysis of photosynthesis (A) was then performed using data from CO2 response curves. Pivotal results. Stomatal conductance imposed greater limitations on photosynthesis (42%–67%) than mesophyll conductance (5%–17%), but no significant differences in g m were observed between the two conifer species. At the mesic lower hillslope position, A , g s, and g m increased during the growing season despite declines in soil moisture. In contrast, at the drier upper hillslope position, declines in soil moisture and increases in air temperature during the growing season are correlated with reductions in g s but not with A or g m. Conclusions. Adjustments in g m played a potentially important role in sustaining photosynthesis and improving plant water use efficiency when stomatal conductance decreased with water limitation during the growing season at the research site. Sustained g m with seasonal drought may be an important mechanism allowing conifers to survive and maintain competitive dominance in low-resource habitats. [ABSTRACT FROM AUTHOR] |
| Copyright of International Journal of Plant Sciences is the property of University of Chicago Press 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.) | |
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| Header | DbId: 8gh DbLabel: GreenFILE An: 155515945 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Topographic Controls on Stomatal and Mesophyll Limitations to Photosynthesis in Two Subalpine Conifers. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Guo%2C+Jiemin%22">Guo, Jiemin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jiemin2014@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Beverly%2C+Daniel+P%2E%22">Beverly, Daniel P.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mercer%2C+Jason+J%2E%22">Mercer, Jason J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cook%2C+Craig+S%2E%22">Cook, Craig S.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ewers%2C+Brent+E%2E%22">Ewers, Brent E.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Williams%2C+David+G%2E%22">Williams, David G.</searchLink><relatesTo>1,3</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Plant+Sciences%22">International Journal of Plant Sciences</searchLink>. Mar/Apr2022, Vol. 183 Issue 3, p205-219. 15p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Plant-water+relationships%22">Plant-water relationships</searchLink><br />*<searchLink fieldCode="DE" term="%22Water+efficiency%22">Water efficiency</searchLink><br />*<searchLink fieldCode="DE" term="%22Photosynthesis%22">Photosynthesis</searchLink><br />*<searchLink fieldCode="DE" term="%22Soil+moisture%22">Soil moisture</searchLink><br /><searchLink fieldCode="DE" term="%22Stomata%22">Stomata</searchLink><br /><searchLink fieldCode="DE" term="%22Lodgepole+pine%22">Lodgepole pine</searchLink><br /><searchLink fieldCode="DE" term="%22Conifers%22">Conifers</searchLink><br /><searchLink fieldCode="DE" term="%22Leaf+physiology%22">Leaf physiology</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Rocky+Mountains%22">Rocky Mountains</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Premise of research. Leaf stomatal and mesophyll conductances limit photosynthesis and influence water use efficiency. Few studies have quantified the relative limitations imposed by these CO2 diffusion pathways on photosynthesis in mature conifer trees under natural conditions. Here, we report observations of stomatal and mesophyll conductance changes during seasonal drying across contrasting topographic positions in two Rocky Mountain conifers. We predicted that topographic controls on soil water availability and energy balance would determine limitations to photosynthesis by mesophyll conductance across conifer species with contrasting patterns of stomatal and hydraulic traits. Methodology. Concurrent measurements of leaf gas exchange and carbon isotope discrimination were used to estimate stomatal (g s) and mesophyll (g m) conductance in branches of an isohydric species, lodgepole pine (Pinus contorta), and an anisohydric species, Engelmann spruce (Picea engelmannii), in the central Rocky Mountains. Quantitative limitation analysis of photosynthesis (A) was then performed using data from CO2 response curves. Pivotal results. Stomatal conductance imposed greater limitations on photosynthesis (42%–67%) than mesophyll conductance (5%–17%), but no significant differences in g m were observed between the two conifer species. At the mesic lower hillslope position, A , g s, and g m increased during the growing season despite declines in soil moisture. In contrast, at the drier upper hillslope position, declines in soil moisture and increases in air temperature during the growing season are correlated with reductions in g s but not with A or g m. Conclusions. Adjustments in g m played a potentially important role in sustaining photosynthesis and improving plant water use efficiency when stomatal conductance decreased with water limitation during the growing season at the research site. Sustained g m with seasonal drought may be an important mechanism allowing conifers to survive and maintain competitive dominance in low-resource habitats. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of International Journal of Plant Sciences is the property of University of Chicago Press 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: 10.1086/718050 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 15 StartPage: 205 Subjects: – SubjectFull: Plant-water relationships Type: general – SubjectFull: Water efficiency Type: general – SubjectFull: Photosynthesis Type: general – SubjectFull: Soil moisture Type: general – SubjectFull: Stomata Type: general – SubjectFull: Lodgepole pine Type: general – SubjectFull: Conifers Type: general – SubjectFull: Leaf physiology Type: general – SubjectFull: Rocky Mountains Type: general Titles: – TitleFull: Topographic Controls on Stomatal and Mesophyll Limitations to Photosynthesis in Two Subalpine Conifers. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Guo, Jiemin – PersonEntity: Name: NameFull: Beverly, Daniel P. – PersonEntity: Name: NameFull: Mercer, Jason J. – PersonEntity: Name: NameFull: Cook, Craig S. – PersonEntity: Name: NameFull: Ewers, Brent E. – PersonEntity: Name: NameFull: Williams, David G. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 03 Text: Mar/Apr2022 Type: published Y: 2022 Identifiers: – Type: issn-print Value: 10585893 Numbering: – Type: volume Value: 183 – Type: issue Value: 3 Titles: – TitleFull: International Journal of Plant Sciences Type: main |
| ResultId | 1 |
