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Leaf anatomy mediates coordination of leaf hydraulic conductance and mesophyll conductance to CO 2 in Oryza
Author(s) -
Xiong Dongliang,
Flexas Jaume,
Yu Tingting,
Peng Shaobing,
Huang Jianliang
Publication year - 2017
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.14186
Subject(s) - xylem , conductance , stomatal conductance , photosynthesis , oryza sativa , botany , stomatal density , biology , positive correlation , horticulture , chemistry , biophysics , physics , biochemistry , gene , condensed matter physics , medicine
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 H 2 O and CO 2 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 .