Stem xylem resistance to cavitation is related to xylem structure but not to growth and water-use efficiency at the within-population level in Populus nigra L

© The Author 2015. Published by Oxford University Press on behalf of the Society for Experimental Biology. All rights reserved. For permissions, please email: journals.permissionsoup.com.

Bibliographische Detailangaben
Veröffentlicht in:Journal of experimental botany. - 1985. - 66(2015), 15 vom: 18. Aug., Seite 4643-52
1. Verfasser: Guet, Justine (VerfasserIn)
Weitere Verfasser: Fichot, Régis, Lédée, Camille, Laurans, Françoise, Cochard, Hervé, Delzon, Sylvain, Bastien, Catherine, Brignolas, Franck
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2015
Zugriff auf das übergeordnete Werk:Journal of experimental botany
Schlagworte:Journal Article Bud phenology Populus nigra bulk leaf carbon isotope discrimination drought-induced cavitation functional trade-offs growth riparian species water-use efficiency within-population genetic variation mehr... xylem structure. Water 059QF0KO0R
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245 1 0 |a Stem xylem resistance to cavitation is related to xylem structure but not to growth and water-use efficiency at the within-population level in Populus nigra L 
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520 |a © The Author 2015. Published by Oxford University Press on behalf of the Society for Experimental Biology. All rights reserved. For permissions, please email: journals.permissionsoup.com. 
520 |a Xylem resistance to drought-induced cavitation is a key trait of plant water relations. This study assesses the genetic variation expressed for stem cavitation resistance within a population of a riparian species, the European black poplar (Populus nigra L.), and explores its relationships with xylem anatomy, water-use efficiency (WUE), and growth. Sixteen structural and physiological traits related to cavitation resistance, xylem anatomy, growth, bud phenology, and WUE were measured on 33 P. nigra genotypes grown under optimal irrigation in a 2-year-old clonal experiment in a nursery. Significant genetic variation was expressed for the xylem tension inducing 50% loss of hydraulic conductivity (Ψ50) within the studied population, as attested by the high value of broad-sense heritability estimated for this trait (H (2) ind = 0.72). Stem cavitation resistance was associated with xylem structure: the more cavitation-resistant genotypes exhibited lower hydraulic efficiency and higher mechanical reinforcement as assessed from stem xylem cross sections. By contrast, Ψ50 was not significantly related to shoot height increment, total above-ground dry mass, or bulk leaf carbon isotope discrimination, a proxy for intrinsic WUE. These findings indicate that the trade-offs between xylem resistance to cavitation, hydraulic efficiency, and mechanical reinforcement can occur at the within-population level. Given that the studied genotypes were exposed to the same environmental conditions and evolutionary drivers in situ, the trade-offs detected at this scale are expected to reflect true functional relationships 
650 4 |a Journal Article 
650 4 |a Bud phenology 
650 4 |a Populus nigra 
650 4 |a bulk leaf carbon isotope discrimination 
650 4 |a drought-induced cavitation 
650 4 |a functional trade-offs 
650 4 |a growth 
650 4 |a riparian species 
650 4 |a water-use efficiency 
650 4 |a within-population genetic variation 
650 4 |a xylem structure. 
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700 1 |a Fichot, Régis  |e verfasserin  |4 aut 
700 1 |a Lédée, Camille  |e verfasserin  |4 aut 
700 1 |a Laurans, Françoise  |e verfasserin  |4 aut 
700 1 |a Cochard, Hervé  |e verfasserin  |4 aut 
700 1 |a Delzon, Sylvain  |e verfasserin  |4 aut 
700 1 |a Bastien, Catherine  |e verfasserin  |4 aut 
700 1 |a Brignolas, Franck  |e verfasserin  |4 aut 
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