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, Sarah Exbrayat, Laurent Gentzbittel, Georges Bertoni, Pierre Maury, Mohamad Reza Naghavie, Ali Peyghambari, Mounavar Badri, Cécile Ben, Frédéric Debelle, Ahmad Sarrafi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

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 100mm 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.

Original languageEnglish
Pages (from-to)983-1001
Number of pages19
JournalFunctional Plant Biology
Volume41
Issue number9
DOIs
Publication statusPublished - 2014
Externally publishedYes

Keywords

  • content
  • K
  • Na
  • Photosystem II efficiency
  • recombinant inbred lines.

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