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000185940 1001_ $$0P:(DE-Juel1)136919$$aFanourakis, Dimitrios$$b0$$eCorresponding Author
000185940 245__ $$aPore size regulates operating stomatal conductance, while stomatal densities drive the partitioning of conductance between leaf sides
000185940 260__ $$aOxford$$bOxford University Press$$c2015
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000185940 520__ $$aBackground and Aims Leaf gas exchange is influenced by stomatal size, density, distribution between the leaf adaxial and abaxial sides, as well as by pore dimensions. This study aims to quantify which of these traits mainly underlie genetic differences in operating stomatal conductance (gs) and addresses possible links between anatomical traits and regulation of pore width.Methods Stomatal responsiveness to desiccation, gs-related anatomical traits of each leaf side and estimated gs (based on these traits) were determined for 54 introgression lines (ILs) generated by introgressing segments of Solanum pennelli into the S. lycopersicum ‘M82’. A quantitative trait locus (QTL) analysis for stomatal traits was also performed.Key Results A wide genetic variation in stomatal responsiveness to desiccation was observed, a large part of which was explained by stomatal length. Operating gs ranged over a factor of five between ILs. The pore area per stomatal area varied 8-fold among ILs (2–16 %), and was the main determinant of differences in operating gs between ILs. Operating gs was primarily positioned on the abaxial surface (60–83 %), due to higher abaxial stomatal density and, secondarily, to larger abaxial pore area. An analysis revealed 64 QTLs for stomatal traits in the ILs, most of which were in the direction of S. pennellii.Conclusions The data indicate that operating and maximum gs of non-stressed leaves maintained under stable conditions deviate considerably (by 45–91 %), because stomatal size inadequately reflects operating pore area (R2 = 0·46). Furthermore, it was found that variation between ILs in both stomatal sensitivity to desiccation and operating gs is associated with features of individual stoma. In contrast, genotypic variation in gs partitioning depends on the distribution of stomata between the leaf adaxial and abaxial epidermis. 
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000185940 7001_ $$0P:(DE-HGF)0$$aGiday, H.$$b1
000185940 7001_ $$0P:(DE-HGF)0$$aMilla, R.$$b2
000185940 7001_ $$0P:(DE-Juel1)129379$$aPieruschka, R.$$b3
000185940 7001_ $$0P:(DE-HGF)0$$aKjaer, K. H.$$b4
000185940 7001_ $$0P:(DE-Juel1)162335$$aBolger, M.$$b5
000185940 7001_ $$0P:(DE-Juel1)151349$$aVasilevski, A.$$b6
000185940 7001_ $$0P:(DE-HGF)0$$aNunes-Nesi, A.$$b7
000185940 7001_ $$0P:(DE-Juel1)143649$$aFiorani, F.$$b8
000185940 7001_ $$0P:(DE-HGF)0$$aOttosen, C.-O.$$b9
000185940 773__ $$0PERI:(DE-600)1461328-1$$a10.1093/aob/mcu247$$gp. mcu247$$n4$$p555-565$$tAnnals of botany$$v115$$x1095-8290$$y2015
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