Additive effects of high growth rate and low transpiration rate drive differences in whole plant transpiration efficiency among black poplar genotypes
Additive effects of high growth rate and low transpiration rate drive differences in whole plant transpiration efficiency among black poplar genotypes
Poplar plantations, widely used for the production of woody biomass, might be at high risk from the climate change-induced increase in the frequency of drought periods. Therefore, selecting improved genotypes, which are highly productive but with a high water use efficiency (WUE), is becoming a major target. The use of automated weighing systems in controlled environments facilitates the estimation of cumulated water loss and whole plant transpiration efficiency (TE). Differences in TE and leaf level intrinsic WUE as well as the contribution of underlying ecophysiological traits were determined in three contrasting P. nigra genotypes. Strong differences in TE among the selected genotypes were congruent with differences in leaf level intrinsic WUE. Our data show that a high total leaf area was overcompensated by a low per leaf area transpiration rate, leading to higher TE in highly productive genotypes originating from cool locations. Nocturnal water loss was relatively low but contributed to variations in TE among genotypes. In response to drought, leaf level WUE increased but not TE, suggesting that carbon losses due to whole plant respiration could offset the drought-induced increase in intrinsic WUE.
Intraspecific diversity, Nocturnal transpiration, Poplar, Transpiration efficiency, Water deficit, Water use efficiency
Bogeat-Triboulot, M. B.
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Buré, C.
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Gerardin, T.
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Chuste, P. A.
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Le Thiec, D.
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Hummel, I.
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Durand, M.
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Wildhagen, H.
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Douthe, C.
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Molins, A.
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Galmés, J.
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Smith, H. K.
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Flexas, J.
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Polle, A.
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Brendel, O.
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1 October 2019
Bogeat-Triboulot, M. B.
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Buré, C.
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Gerardin, T.
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Chuste, P. A.
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Le Thiec, D.
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Hummel, I.
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Durand, M.
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Wildhagen, H.
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Douthe, C.
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Molins, A.
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Galmés, J.
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Smith, H. K.
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Flexas, J.
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Polle, A.
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Brendel, O.
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Bogeat-Triboulot, M. B., Buré, C., Gerardin, T., Chuste, P. A., Le Thiec, D., Hummel, I., Durand, M., Wildhagen, H., Douthe, C., Molins, A., Galmés, J., Smith, H. K., Flexas, J., Polle, A., Taylor, G. and Brendel, O.
(2019)
Additive effects of high growth rate and low transpiration rate drive differences in whole plant transpiration efficiency among black poplar genotypes.
Environmental and Experimental Botany, 166, [103784].
(doi:10.1016/j.envexpbot.2019.05.021).
Abstract
Poplar plantations, widely used for the production of woody biomass, might be at high risk from the climate change-induced increase in the frequency of drought periods. Therefore, selecting improved genotypes, which are highly productive but with a high water use efficiency (WUE), is becoming a major target. The use of automated weighing systems in controlled environments facilitates the estimation of cumulated water loss and whole plant transpiration efficiency (TE). Differences in TE and leaf level intrinsic WUE as well as the contribution of underlying ecophysiological traits were determined in three contrasting P. nigra genotypes. Strong differences in TE among the selected genotypes were congruent with differences in leaf level intrinsic WUE. Our data show that a high total leaf area was overcompensated by a low per leaf area transpiration rate, leading to higher TE in highly productive genotypes originating from cool locations. Nocturnal water loss was relatively low but contributed to variations in TE among genotypes. In response to drought, leaf level WUE increased but not TE, suggesting that carbon losses due to whole plant respiration could offset the drought-induced increase in intrinsic WUE.
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Accepted/In Press date: 29 May 2019
e-pub ahead of print date: 19 June 2019
Published date: 1 October 2019
Keywords:
Intraspecific diversity, Nocturnal transpiration, Poplar, Transpiration efficiency, Water deficit, Water use efficiency
Identifiers
Local EPrints ID: 432703
URI: http://eprints.soton.ac.uk/id/eprint/432703
ISSN: 0098-8472
PURE UUID: 282868c0-e4a2-4baa-b85e-7fa392b58a92
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Date deposited: 24 Jul 2019 16:30
Last modified: 18 Mar 2024 05:24
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Contributors
Author:
M. B. Bogeat-Triboulot
Author:
C. Buré
Author:
T. Gerardin
Author:
P. A. Chuste
Author:
D. Le Thiec
Author:
I. Hummel
Author:
M. Durand
Author:
H. Wildhagen
Author:
C. Douthe
Author:
A. Molins
Author:
J. Galmés
Author:
H. K. Smith
Author:
J. Flexas
Author:
A. Polle
Author:
G. Taylor
Author:
O. Brendel
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