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QTL mapping of physiological traits associated with salt tolerance inMedicago truncatulaRecombinant Inbred Lines

Authors
Journal
Genomics
0888-7543
Publisher
Elsevier
Volume
99
Issue
2
Identifiers
DOI: 10.1016/j.ygeno.2011.11.005
Keywords
  • M. Truncatula
  • Recombinant Inbred Lines
  • Nacl Stress
  • Na+
  • K+
  • Quantitative Traits Loci
Disciplines
  • Biology

Abstract

Abstract In this study, QTL mapping of physiological traits in the model Legume (Medicago truncatula) was performed using a set of RILs derived from LR5. Twelve parameters associated with Na+ and K+ content in leaves, stems and roots were measured. Broad-sense heritability of these traits was ranged from 0.15 to 0.83 in control and from 0.14 to 0.61 in salt stress. Variation among RILs was dependent on line, treatment and line by treatment effect. We mapped 6 QTLs in control, 2 in salt stress and 5 for sensitivity index. No major QTL was identified indicating that tolerance to salt stress is governed by several genes with low effects. Detected QTL for leaf, stem and root traits did not share the same map locations, suggesting that genes controlling transport of Na+ and K+ may be different. The maximum of QTL was observed on chromosome 1, no QTL was detected on chromosomes 5 and 6.

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