Increased adaxial stomatal density is associated with greater mesophyll surface area exposed to intercellular air spaces and mesophyll conductance in diverse C grasses.

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ID: 37498
2019
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Abstract
Mesophyll conductance (g ) is the diffusion of CO from intercellular air spaces (IAS) to the first site of carboxylation in the mesophyll cells. In C species, g is influenced by diverse leaf structural and anatomical traits; however, little is known about traits affecting g in C species. To address this knowledge gap, we used online oxygen isotope discrimination measurements to estimate g and microscopy techniques to measure leaf structural and anatomical traits potentially related to g in 18 C grasses. In this study, g scaled positively with photosynthesis and intrinsic water-use efficiency (TE ), but not with stomatal conductance. Also, g was not determined by a single trait but was positively correlated with adaxial stomatal densities (SD ), stomatal ratio (SR), mesophyll surface area exposed to IAS (S ) and leaf thickness. However, g was not related to abaxial stomatal densities (SD ) and mesophyll cell wall thickness (T ). Our study suggests that greater SD and SR increased g by increasing S and creating additional parallel pathways for CO diffusion inside mesophyll cells. Thus, SD , SR and S are important determinants of C -g and could be the target traits selected or modified for achieving greater g and TE in C species.
Reference Key
pathare2019increasedthe Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Pathare, Varsha S;Koteyeva, Nuria;Cousins, Asaph B;
Journal The New phytologist
Year 2019
DOI
10.1111/nph.16106
URL
Keywords Keywords not found

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