Functional traits diversity and fitness evaluation in response to salt stress in some Medicago spp wild populations
2016
Amokrane, M. S. Y. | Kadri, A. | Laouar, Meriem | Ben, Cécile | Julier, Bernadette | Gentzbittel, Laurent | Abdelguerfi, A. | Laboratoire d’Amélioration Integrative des Productions Végétales ; École Nationale Supérieure d’Agronomie [Alger] (ENSA) | Laboratoire des Ressources Génétiques et Biotechnologies ; École Nationale Supérieure d’Agronomie [Alger] (ENSA) | Laboratoire Ecologie Fonctionnelle et Environnement (LEFE) ; Institut Ecologie et Environnement - CNRS Ecologie et Environnement (INEE-CNRS) ; Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3) ; Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP) ; Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) ; Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP) ; Université de Toulouse (UT) | Centre National de la Recherche Scientifique (CNRS) | Institut National Polytechnique (Toulouse) (Toulouse INP) ; Université de Toulouse (UT) | Université Toulouse III - Paul Sabatier (UT3) ; Université de Toulouse (UT) | Faculté des Sciences, Département d’Agronomie ; University of M'sila / Université Mohamed Boudiaf - M'sila (Uni M'sila) | Unité de Recherche Pluridisciplinaire Prairies et Plantes Fourragères (P3F) ; Institut National de la Recherche Agronomique (INRA) | International Legume Society (ILS). INT.
Land salinity is one of the major abiotic constraints that affect negatively crop production worldwide. Medicago genus, mostly composed by annual species, is of a real interest in improving soil fertility and maintaining pastures for livestock. We assessed adaptive traits for salt tolerance in 40 contrasted populations belonging to 6 Medicago species. In a common site, trial was performed in saline and non-saline soils where functional and fitness traits were recorded. Only M. ciliaris populations survived in the saline soil, highlighting the negative effect of even low salt levels at plant lift. ANOVA and PCA revealed that lifting rate, length branch at flowering time and total pod number might be involved in salt tolerance. The response to salt stress of Medicago was further studied by analyzing germination kinetics of 37 populations under five ranges of NaCl concentrations from 0 to 200 mM, during 7days. Kaplan-Meier survivor curves and Cox PH models indicated that time to 50% germination, germinability and germination synchrony are affected by the increase of salts. The risk of non-germinated seeds depends on species, populations and NaCl concentrations. Altogether, these results show that both salt level and exposition duration affect the phenotypical traits. Local adaptation may partly explain the patterns of salt tolerance. M. ciliaris is the most tolerant species, with a relatively high level of intraspecific variability for most studied traits.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
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تم تزويد هذا السجل من قبل Institut national de la recherche agronomique