Leaf anatomy mediates coordination of leaf hydraulic conductance and mesophyll conductance to CO2 in Oryza. Issue 2 (22nd September 2016)

• Record Type: Journal Article
• Authors: Xiong, Dongliang; Flexas, Jaume; Yu, Tingting; Peng, Shaobing; Huang, Jianliang
• Is Part Of: New phytologist. Volume 213:Issue 2(2017)
• Page Start: 572
• Page End: 583
• Publication Date: 2016-09-22
• Subjects: leaf hydraulic conductance (Kleaf) -- leaf vein density -- mesophyll conductance (gm) -- mesophyll structure -- rice (Oryza) -- stomata; Botany -- Periodicals; 580
• DOI: 10.1111/nph.14186
• Languages: English
• ISSNs: 0028-646X

Abstract

Summary: Leaf hydraulic conductance ( K leaf ) and mesophyll conductance ( g m ) both represent major constraints to photosynthetic rate ( A ), and previous studies have suggested that K leaf and g m is correlated in leaves. However, there is scarce empirical information about their correlation. In this study, K leaf, leaf hydraulic conductance inside xylem ( K x ), leaf hydraulic conductance outside xylem ( K ox ), A, stomatal conductance ( g s ), g m, and anatomical and structural leaf traits in 11 Oryza genotypes were investigated to elucidate the correlation of H2 O and CO2 diffusion inside leaves. All of the leaf functional and anatomical traits varied significantly among genotypes. K leaf was not correlated with the maximum theoretical stomatal conductance calculated from stomatal dimensions ( g smax ), and neither g s nor g smax were correlated with K x . Moreover, K ox was linearly correlated with g m and both were closely related to mesophyll structural traits. These results suggest that K leaf and g m are related to leaf anatomical and structural features, which may explain the mechanism for correlation between g m and K leaf .