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Increased adaxial stomatal density is associated with greater mesophyll surface area exposed to intercellular air spaces and mesophyll conductance in diverse C4 grasses.
New Phytol 2019NP

Abstract

Mesophyll conductance (gm) is the diffusion of CO2 from intercellular air spaces (IAS) to the first site of carboxylation in the mesophyll cells. In C3 species, gm is influenced by diverse leaf structural and anatomical traits; however, little is known about traits affecting gm in C4 species. To address this knowledge gap, we used online oxygen isotope discrimination measurements to estimate gm and microscopy techniques to measure leaf structural and anatomical traits potentially related to gm in 18 C4 grasses. In this study, gm scaled positively with photosynthesis and intrinsic water-use efficiency (TEi), but not with stomatal conductance. Also, gm was not determined by a single trait but was positively correlated with adaxial stomatal densities (SDada), stomatal ratio (SR), mesophyll surface area exposed to IAS (Smes) and leaf thickness. However, gm was not related to abaxial stomatal densities (SDaba) and mesophyll cell wall thickness (TCW). Our study suggests that greater SDada and SR increased gm by increasing Smes and creating additional parallel pathways for CO2 diffusion inside mesophyll cells. Thus, SDada , SR and Smes are important determinants of C4 -gm and could be the target traits selected or modified for achieving greater gm and TEi in C4 species.

Authors+Show Affiliations

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.School of Biological Sciences, Washington State University, Pullman, WA, 99164-4236, USA.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31400232

Citation

Pathare, Varsha S., et al. "Increased Adaxial Stomatal Density Is Associated With Greater Mesophyll Surface Area Exposed to Intercellular Air Spaces and Mesophyll Conductance in Diverse C4 Grasses." The New Phytologist, 2019.
Pathare VS, Koteyeva N, Cousins AB. Increased adaxial stomatal density is associated with greater mesophyll surface area exposed to intercellular air spaces and mesophyll conductance in diverse C4 grasses. New Phytol. 2019.
Pathare, V. S., Koteyeva, N., & Cousins, A. B. (2019). Increased adaxial stomatal density is associated with greater mesophyll surface area exposed to intercellular air spaces and mesophyll conductance in diverse C4 grasses. The New Phytologist, doi:10.1111/nph.16106.
Pathare VS, Koteyeva N, Cousins AB. Increased Adaxial Stomatal Density Is Associated With Greater Mesophyll Surface Area Exposed to Intercellular Air Spaces and Mesophyll Conductance in Diverse C4 Grasses. New Phytol. 2019 Aug 10; PubMed PMID: 31400232.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Increased adaxial stomatal density is associated with greater mesophyll surface area exposed to intercellular air spaces and mesophyll conductance in diverse C4 grasses. AU - Pathare,Varsha S, AU - Koteyeva,Nuria, AU - Cousins,Asaph B, Y1 - 2019/08/10/ PY - 2019/05/23/received PY - 2019/08/01/accepted PY - 2019/8/11/pubmed PY - 2019/8/11/medline PY - 2019/8/11/entrez KW - C4 grasses KW - intrinsic water-use efficiency KW - leaf thickness KW - mesophyll conductance KW - mesophyll surface area exposed to intercellular air space (Smes) KW - stomatal densities KW - stomatal ratio JF - The New phytologist JO - New Phytol. N2 - Mesophyll conductance (gm) is the diffusion of CO2 from intercellular air spaces (IAS) to the first site of carboxylation in the mesophyll cells. In C3 species, gm is influenced by diverse leaf structural and anatomical traits; however, little is known about traits affecting gm in C4 species. To address this knowledge gap, we used online oxygen isotope discrimination measurements to estimate gm and microscopy techniques to measure leaf structural and anatomical traits potentially related to gm in 18 C4 grasses. In this study, gm scaled positively with photosynthesis and intrinsic water-use efficiency (TEi), but not with stomatal conductance. Also, gm was not determined by a single trait but was positively correlated with adaxial stomatal densities (SDada), stomatal ratio (SR), mesophyll surface area exposed to IAS (Smes) and leaf thickness. However, gm was not related to abaxial stomatal densities (SDaba) and mesophyll cell wall thickness (TCW). Our study suggests that greater SDada and SR increased gm by increasing Smes and creating additional parallel pathways for CO2 diffusion inside mesophyll cells. Thus, SDada , SR and Smes are important determinants of C4 -gm and could be the target traits selected or modified for achieving greater gm and TEi in C4 species. SN - 1469-8137 UR - https://www.unboundmedicine.com/medline/citation/31400232/Increased_adaxial_stomatal_density_is_associated_with_greater_mesophyll_surface_area_exposed_to_intercellular_air_spaces_and_mesophyll_conductance_in_diverse_C4_grasses L2 - https://doi.org/10.1111/nph.16106 DB - PRIME DP - Unbound Medicine ER -