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genetics of water-use efficiency and its relation to growth in maritime pine

To meet the increasing demand of wood biomass worldwide in the context of climate change, developing improved forest tree varieties for high productivity in water-limited conditions is becoming a major issue. This involves breeding for genotypes combining high growth and moderate water loss and thus...

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Published in:Journal of experimental botany 2014-09, Vol.65 (17), p.4757-4768
Main Authors: Marguerit, Elisa, Bouffier, Laurent, Chancerel, Emilie, Costa, Paolo, Lagane, Frédéric, Guehl, Jean-Marc, Plomion, Christophe, Brendel, Oliver
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creator Marguerit, Elisa
Bouffier, Laurent
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Plomion, Christophe
Brendel, Oliver
description To meet the increasing demand of wood biomass worldwide in the context of climate change, developing improved forest tree varieties for high productivity in water-limited conditions is becoming a major issue. This involves breeding for genotypes combining high growth and moderate water loss and thus high water-use efficiency (WUE). The present work provides original data about the genetics of intrinsic WUE (the ratio between net CO2 assimilation rate and stomatal conductance, also estimated by carbon isotope composition of plant material; δ13C) and its relation to growth in Pinus pinaster Ait. First, heritability for δ13C was estimated (0.29) using a 15-year-old progeny trial (Landes provenance), with no significant differences among three sites contrasting in water availability. High intersite correlations (0.63–0.91) and significant but low genotype–environment interactions were detected. Secondly, the genetic architectures of δ13C and growth were studied in a three-generation inbred pedigree, introducing the genetic background of a more-drought-adapted parent (Corsican provenance), at ages of 2 years (greenhouse) and 9 years (plantation). One of the quantitative trait loci (QTLs) identified in the field experiment, explaining 67% of the phenotypic variance, was also found among the QTLs detected in the greenhouse experiment, where it colocalized with QTLs for intrinsic WUE and stomatal conductance. This work was able to show that higher WUE was not genetically linked to less growth, allowing thus genetic improvement of water use. As far as is known, the heritability and QTL effects estimated here are based on the highest number of genotypes measured to date.
doi_str_mv 10.1093/jxb/eru226
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source JSTOR Archival Journals and Primary Sources Collection; Oxford Journals Online
subjects biomass
Breeding
carbon
carbon dioxide
Carbon isotopes
Carbon Isotopes - metabolism
Climate Change
field experimentation
Forest genetics
forest trees
France
genetic background
genetic improvement
Genetic variation
Genotypes
greenhouse experimentation
greenhouses
heritability
isotopes
Life Sciences
pedigree
Phenotypic traits
phenotypic variation
Pine trees
Pinus - genetics
Pinus - growth & development
Pinus - metabolism
Pinus pinaster
Plant genetics
Plantations
Population genetics
progeny
provenance
Quantitative trait loci
RESEARCH PAPER
Selection, Genetic
stomatal conductance
Trees - genetics
Trees - growth & development
Trees - metabolism
Water - metabolism
water use efficiency
wood
title genetics of water-use efficiency and its relation to growth in maritime pine
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