The diversity of 13C isotope discrimination in a Quercus robur full-sib family is associated with differences in intrinsic water use efficiency, transpiration efficiency, and stomatal conductance
Identifieur interne : 000621 ( Main/Exploration ); précédent : 000620; suivant : 000622The diversity of 13C isotope discrimination in a Quercus robur full-sib family is associated with differences in intrinsic water use efficiency, transpiration efficiency, and stomatal conductance
Auteurs : Magali Roussel [France] ; Erwin Dreyer [France] ; Pierre Montpied [France] ; Grgoire Le-Provost [France] ; Jean-Marc Guehl [France] ; Oliver Brendel [France]Source :
- Journal of Experimental Botany [ 0022-0957 ] ; 2009-04-20.
Abstract
13C discrimination in organic matter with respect to atmospheric CO2 (13C) is under tight genetic control in many plant species, including the pedunculate oak (Quercus robur L.) full-sib progeny used in this study. 13C is expected to reflect intrinsic water use efficiency, but this assumption requires confirmation due to potential interferences with mesophyll conductance to CO2, or post-photosynthetic discrimination. In order to dissect the observed 13C variability in this progeny, six genotypes that have previously been found to display extreme phenotypic values of 13C [either very high (high ) or low (low ) phenotype] were selected, and transpiration efficiency (TE; accumulated biomass/transpired water), net CO2 assimilation rate (A), stomatal conductance for water vapour (gs), and intrinsic water use efficiency (WiA/gs) were compared with 13C in bulk leaf matter, wood, and cellulose in wood. As expected, high displayed higher values of 13C not only in bulk leaf matter, but also in wood and cellulose. This confirmed the stability of the genotypic differences in 13C recorded earlier. High also displayed lower TE, lower Wi, and higher gs. A small difference was detected in photosynthetic capacity but none in mesophyll conductance to CO2. High and low displayed very similar leaf anatomy, except for higher stomatal density in high . Finally, diurnal courses of leaf gas exchange revealed a higher gs in high in the morning than in the afternoon when the difference decreased. The gene ERECTA, involved in the control of water use efficiency, leaf differentiation, and stomatal density, displayed higher expression levels in low . In this progeny, the variability of 13C correlated closely with that of Wi and TE. Genetic differences of 13C and Wi can be ascribed to differences in stomatal conductance and stomatal density but not in photosynthetic capacity.
Url:
DOI: 10.1093/jxb/erp100
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In order to dissect the observed 13C variability in this progeny, six genotypes that have previously been found to display extreme phenotypic values of 13C [either very high (high ) or low (low ) phenotype] were selected, and transpiration efficiency (TE; accumulated biomass/transpired water), net CO2 assimilation rate (A), stomatal conductance for water vapour (gs), and intrinsic water use efficiency (WiA/gs) were compared with 13C in bulk leaf matter, wood, and cellulose in wood. As expected, high displayed higher values of 13C not only in bulk leaf matter, but also in wood and cellulose. This confirmed the stability of the genotypic differences in 13C recorded earlier. High also displayed lower TE, lower Wi, and higher gs. A small difference was detected in photosynthetic capacity but none in mesophyll conductance to CO2. High and low displayed very similar leaf anatomy, except for higher stomatal density in high . Finally, diurnal courses of leaf gas exchange revealed a higher gs in high in the morning than in the afternoon when the difference decreased. The gene ERECTA, involved in the control of water use efficiency, leaf differentiation, and stomatal density, displayed higher expression levels in low . In this progeny, the variability of 13C correlated closely with that of Wi and TE. Genetic differences of 13C and Wi can be ascribed to differences in stomatal conductance and stomatal density but not in photosynthetic capacity.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Aquitaine</li><li>Grand Est</li><li>Lorraine (région)</li><li>Nouvelle-Aquitaine</li></region><settlement><li>Talence</li><li>Vandoeuvre</li></settlement></list><tree><country name="France"><region name="Grand Est"><name sortKey="Roussel, Magali" sort="Roussel, Magali" uniqKey="Roussel M" first="Magali" last="Roussel">Magali Roussel</name></region><name sortKey="Brendel, Oliver" sort="Brendel, Oliver" uniqKey="Brendel O" first="Oliver" last="Brendel">Oliver Brendel</name><name sortKey="Brendel, Oliver" sort="Brendel, Oliver" uniqKey="Brendel O" first="Oliver" last="Brendel">Oliver Brendel</name><name sortKey="Dreyer, Erwin" sort="Dreyer, Erwin" uniqKey="Dreyer E" first="Erwin" last="Dreyer">Erwin Dreyer</name><name sortKey="Guehl, Jean Marc" sort="Guehl, Jean Marc" uniqKey="Guehl J" first="Jean-Marc" last="Guehl">Jean-Marc Guehl</name><name sortKey="Le Provost, Grgoire" sort="Le Provost, Grgoire" uniqKey="Le Provost G" first="Grgoire" last="Le-Provost">Grgoire Le-Provost</name><name sortKey="Montpied, Pierre" sort="Montpied, Pierre" uniqKey="Montpied P" first="Pierre" last="Montpied">Pierre Montpied</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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