Title:
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The Peclet effect on leaf water enrichment correlates with leaf hydraulic conductance and mesophyll conductance for CO2
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Author:
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Ferrio Díaz, Juan Pedro; Pou, Alicia; Florez-Sarasa, Igor; Gessler, Arthur; Kodama, Naomi; Flexas, Jaume; Ribas-Carbó, Miquel
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Notes:
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Leaf water gets isotopically enriched through transpiration,
and diffusion of enriched water through the leaf depends on
transpiration flow and the effective path length (L).The aim
of this work was to relate L with physiological variables
likely to respond to similar processes. We studied the
response to drought and vein severing of leaf lamina
hydraulic conductance (Klamina), mesophyll conductance for
CO2 (gm) and leaf water isotope enrichment in Vitis vinifera
L cv. Grenache. We hypothesized that restrictions in
water pathways would reduce Klamina and increase L. As a
secondary hypothesis, we proposed that, given the common
pathways for water and CO2 involved, a similar response
should be found in gm. Our results showed that L was
strongly related to mesophyll variables, such as Klamina or gm
across experimental drought and vein-cutting treatments,
showing stronger relationships than with variables included
as input parameters for the models, such as transpiration.
Our findings were further supported by a literature survey
showing a close link between L and leaf hydraulic conductance
(Kleaf = 31.5 ¥ L-0.43, r2 = 0.60, n = 24). The strong correlation
found between L, Klamina and gm supports the idea
that water and CO2 share an important part of their diffusion
pathways through the mesophyll.
This work was funded by the Marie Curie projects MC-IEF-039418 (FP6) and MC-ERG-246725 (FP7), and Spanish projects BFU2008- 01072 (MEFORE) and CGL2009-13079-C02-01 (PALEOISOTREE). A.P. and I.F-S. were supported by FPI fellowships (MCINN, Spain). J.P.F. is supported by the Ramón y Cajal programme (RYC-2008-02050). A.G. acknowledges support by the DFG. |
Subject(s):
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-Drought -Grapevine -Grenache |
Rights:
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(c) Blackwell Publishing Ldt, 2012
info:eu-repo/semantics/restrictedAccess |
Document type:
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article publishedVersion |
Published by:
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Blackwell Publishing Ltd
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