Increased adaxial stomatal density is associated with greater mesophyll surface area exposed to intercellular air spaces and mesophyll conductance in diverse C 4 grasses
Abstract
Summary Mesophyll conductance ( g m ) is the diffusion of CO 2 from intercellular air spaces ( IAS ) to the first site of carboxylation in the mesophyll cells. In C 3 species, g m is influenced by diverse leaf structural and anatomical traits; however, little is known about traits affecting g m in C 4 species. To address this knowledge gap, we used online oxygen isotope discrimination measurements to estimate g m and microscopy techniques to measure leaf structural and anatomical traits potentially related to g m in 18 C 4 grasses. In this study, g m scaled positively with photosynthesis and intrinsic water‐use efficiency ( TE i ), but not with stomatal conductance. Also, g m was not determined by a single trait but was positively correlated with adaxial stomatal densities ( SD ada ), stomatal ratio ( SR ), mesophyll surface area exposed to IAS ( S mes ) and leaf thickness. However, g m was not related to abaxial stomatal densities ( SD aba ) and mesophyll cell wall thickness ( T CW ). Our study suggests that greater SD ada and SR increased g m by increasing S mes and creating additional parallel pathwaysmore »
- Authors:
-
- School of Biological Sciences Washington State University Pullman WA 99164‐4236 USA
- School of Biological Sciences Washington State University Pullman WA 99164‐4236 USA, Laboratory of Anatomy and Morphology V.L. Komarov Botanical Institute of the Russian Academy of Sciences 197376 St Petersburg Russia
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1560286
- Grant/Contract Number:
- DE‐SC0001685
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- New Phytologist
- Additional Journal Information:
- Journal Name: New Phytologist Journal Volume: 225 Journal Issue: 1; Journal ID: ISSN 0028-646X
- Publisher:
- Wiley-Blackwell
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Pathare, Varsha S., Koteyeva, Nuria, and Cousins, Asaph B. Increased adaxial stomatal density is associated with greater mesophyll surface area exposed to intercellular air spaces and mesophyll conductance in diverse C 4 grasses. United Kingdom: N. p., 2019.
Web. doi:10.1111/nph.16106.
Pathare, Varsha S., Koteyeva, Nuria, & Cousins, Asaph B. Increased adaxial stomatal density is associated with greater mesophyll surface area exposed to intercellular air spaces and mesophyll conductance in diverse C 4 grasses. United Kingdom. https://doi.org/10.1111/nph.16106
Pathare, Varsha S., Koteyeva, Nuria, and Cousins, Asaph B. Wed .
"Increased adaxial stomatal density is associated with greater mesophyll surface area exposed to intercellular air spaces and mesophyll conductance in diverse C 4 grasses". United Kingdom. https://doi.org/10.1111/nph.16106.
@article{osti_1560286,
title = {Increased adaxial stomatal density is associated with greater mesophyll surface area exposed to intercellular air spaces and mesophyll conductance in diverse C 4 grasses},
author = {Pathare, Varsha S. and Koteyeva, Nuria and Cousins, Asaph B.},
abstractNote = {Summary Mesophyll conductance ( g m ) is the diffusion of CO 2 from intercellular air spaces ( IAS ) to the first site of carboxylation in the mesophyll cells. In C 3 species, g m is influenced by diverse leaf structural and anatomical traits; however, little is known about traits affecting g m in C 4 species. To address this knowledge gap, we used online oxygen isotope discrimination measurements to estimate g m and microscopy techniques to measure leaf structural and anatomical traits potentially related to g m in 18 C 4 grasses. In this study, g m scaled positively with photosynthesis and intrinsic water‐use efficiency ( TE i ), but not with stomatal conductance. Also, g m was not determined by a single trait but was positively correlated with adaxial stomatal densities ( SD ada ), stomatal ratio ( SR ), mesophyll surface area exposed to IAS ( S mes ) and leaf thickness. However, g m was not related to abaxial stomatal densities ( SD aba ) and mesophyll cell wall thickness ( T CW ). Our study suggests that greater SD ada and SR increased g m by increasing S mes and creating additional parallel pathways for CO 2 diffusion inside mesophyll cells. Thus, SD ada , SR and S mes are important determinants of C 4 ‐ g m and could be the target traits selected or modified for achieving greater g m and TE i in C 4 species.},
doi = {10.1111/nph.16106},
journal = {New Phytologist},
number = 1,
volume = 225,
place = {United Kingdom},
year = {Wed Sep 04 00:00:00 EDT 2019},
month = {Wed Sep 04 00:00:00 EDT 2019}
}
https://doi.org/10.1111/nph.16106
Web of Science
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