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Whole-tree mesophyll conductance reconciles isotopic and gas-exchange estimates of water-use efficiency

Gimeno, Teresa E.; Campany, Courtney E.; Drake, John E.; Barton, Craig V M; Tjoelker, Mark G; Ubierna, Nerea; Marshall, John D.


Photosynthetic water-use efficiency (WUE) describes the link between terrestrial carbon (C) and water cycles. Estimates of intrinsic WUE (iWUE) from gas exchange and C isotopic composition (δ13C) differ due to an internal conductance in the leaf mesophyll (gm) that is variable and seldom computed. We present the first direct estimates of whole-tree gm, together with iWUE from whole-tree gas exchange and δ13C of the phloem (δ13Cph). We measured gas exchange, online 13C-discrimination, and δ13Cph...[Show more]

CollectionsANU Research Publications
Date published: 2020
Type: Journal article
Source: New Phytologist
DOI: 10.1111/nph.17088


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