Genetic variability and identification of quantitative trait loci affecting plant growth and chlorophyll fluorescence parameters in the model legume Medicago truncatula under control and salt stress conditions
Maryam Foroozanfar A B F , Sarah Exbrayat C , Laurent Gentzbittel A B , Georges Bertoni D , Pierre Maury E , Mohamad Reza Naghavie F , Ali Peyghambari F , Mounavar Badri G , Cécile Ben A B , Frédéric Debelle C and Ahmad Sarrafi A B H
+ Author Affiliations
- Author Affiliations
A Institut National Polytechnique (INP), Université Paul Sabatier(UPS), Laboratoire D’Ecologie Fonctionnelle et Environnement, Ecole Nationale Supérieure Agronomique de Toulouse, Université de Toulouse, 18 Chemin de Borde Rouge, BP 32607 Auzeville, 31326 Castanet-Tolosan, France.
B Centre National de la Recherche Scientifique (CNRS), Unité Mixte Recherche 5245, Laboratoire D’Ecologie Fonctionnelle et Environnement (EcoLab), 18 Chemin de Borde Rouge, 31326 Castanet-Tolosan, France.
C Centre National de la Recherche Scientifique (CNRS), Institut National de la Recherche Agronomique, Laboratoire des Interactions Plantes-Microorganismes (UMR441 and UMR 2594), 18 Chemin de Borde Rouge, 31326 Castanet-Tolosan, France.
D Institut National Polytechnique (INP), Ecole Nationale Supérieure Agronomique de Toulouse (ENSAT), Unité Mixte Recherche DYNAFOR (Dynamiques et Écologie des Paysages Agriforestiers), Université de Toulouse, BP 32607, 31326 Castanet-Tolosan, France.
E Institut National Polytechnique (INP), Ecole Nationale Supérieure Agronomique de Toulouse (ENSAT), Institut National de la Recherche Agronomique (INRA), Unité Mixte Recherche AGIR (Agroécologies, Innovations et Ruralités), Université de Toulouse, BP 52627, 31326 Castanet-Tolosan, France.
F Agronomy and Plant Breeding Department, Agricultural & Natural Resources College, University of Tehran, Karaj, 31587-11167, Iran.
G Center of Biotechnology of Borj Cedria, BP 901, Hammam-Lif 2050, Tunisia.
H Corresponding author. Email: sarrafi@ensat.fr
Functional Plant Biology 41(9) 983-1001 https://doi.org/10.1071/FP13370
Submitted: 13 January 2014 Accepted: 14 April 2014 Published: 4 July 2014
Abstract
Salinity is one of the major stresses that limits crop production worldwide and affects most physiological activities in plants. In order to study the genetic control of salt stress in the model legume Medicago truncatula Gaertn., an experiment was undertaken to determine the genetic variability and to identify quantitative trait loci (QTLs) controlling several traits related to plant growth and physiology in a population of recombinant inbred lines. Shoot and root DW, relative water content, leaf area, chlorophyll content, chlorophyll fluorescence parameters, and Na+ and K+ in shoots and roots were measured. The experiment was carried out with three replications. ANOVA showed a large genetic variation and transgressive segregation for the traits studied, suggesting putative complex tolerance mechanisms. A total of 21 QTLs were detected under control conditions and 19 QTLs were identified under 100 mm salt stress conditions, with three QTLs being common to both situations. The percentage of total phenotypic variance explained by the QTLs ranged from 4.6% to 23.01%. Overlapping QTLs for different traits were also observed, which enables us to discriminate independent traits from linked ones. The results should be helpful information for further functional analysis of salt tolerance in M. truncatula.
Additional keywords: K+ content, Na+ content, Photosystem II efficiency, recombinant inbred lines.
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