Weak coordination among petiole, leaf, vein, and gas-exchange traits across Australian angiosperm species and its possible implications

Ecology and Evolution
Sean M GleasonMark Westoby

Abstract

Close coordination between leaf gas exchange and maximal hydraulic supply has been reported across diverse plant life forms. However, it has also been suggested that this relationship may become weak or break down completely within the angiosperms. We examined coordination between hydraulic, leaf vein, and gas-exchange traits across a diverse group of 35 evergreen Australian angiosperms, spanning a large range in leaf structure and habitat. Leaf-specific conductance was calculated from petiole vessel anatomy and was also measured directly using the rehydration technique. Leaf vein density (thought to be a determinant of gas exchange rate), maximal stomatal conductance, and net CO 2 assimilation rate were also measured for most species (n = 19-35). Vein density was not correlated with leaf-specific conductance (either calculated or measured), stomatal conductance, nor maximal net CO 2 assimilation, with r (2) values ranging from 0.00 to 0.11, P values from 0.909 to 0.102, and n values from 19 to 35 in all cases. Leaf-specific conductance calculated from petiole anatomy was weakly correlated with maximal stomatal conductance (r (2) = 0.16; P = 0.022; n = 32), whereas the direct measurement of leaf-specific conductance was weakly ...Continue Reading

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Citations

Apr 18, 2018·American Journal of Botany·Dustin M Ray, Cynthia S Jones
Jan 8, 2019·Plant, Cell & Environment·Sandra J BucciFabían G Scholz
Jul 28, 2020·The New Phytologist·Benjamin BlonderYadvinder Malhi
Jun 1, 2016·Functional Plant Biology : FPB·Caroline A Brocious, Uwe G Hacke

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