Influence of salt stress on the genetically polymorphic system of Sinorhizobium meliloti-Medicago truncatula

The impacts of salt stress (75 mM NaCl) on the ecological efficiency of the genetically polymorphic Sinorhizobium meliloti-Medicago truncatula system were studied. Its impact on a symbiotic system results in an increase of the partners’ variability for symbiotic traits and of the symbiosis integrity...

Full description

Saved in:
Bibliographic Details
Published in:Russian journal of genetics 2014, Vol.50 (7), p.677-685
Main Authors: Kurchak, O. N, Provorov, N. A, Onishchuk, O. P, Vorobyov, N. I, Roumiantseva, M. L, Simarov, B. V
Format: Article
Language:English
Subjects:
Animal Genetics and Genomics
Biomedical and Life Sciences
Biomedicine
cultivars
Genetics of Microorganisms
genotype
Human Genetics
loci
Microbial Genetics and Genomics
nutrition
plasmids
salt stress
Sinorhizobium
sodium chloride
symbiosis
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The impacts of salt stress (75 mM NaCl) on the ecological efficiency of the genetically polymorphic Sinorhizobium meliloti-Medicago truncatula system were studied. Its impact on a symbiotic system results in an increase of the partners’ variability for symbiotic traits and of the symbiosis integrity as indicated by: (a) the specificity of the partners’ interactions-the nonadditive inputs of their genotypes into the variation of symbiotic parameters and (b) the correlative links between these parameters. The structure of the nodD1 locus and the plasmid content correlates to the efficiency of the symbiosis between S. meliloti and M. truncatula genotypes under stress conditions more sufficiently than in the absence of stress. Correlations between the symbiotic efficiency of rhizobia strains and their growth rate outside symbiosis are expressed under stress conditions, not in the absence of stress. Under salt stress symbiotic effectiveness was decreased for M. truncatula line F83005.5, which was salt sensitive for mineral nutrition. The inhibition of symbiotic activity for this line is linked with decreased nodule formation, whereas for Jemalong 6 and DZA315.16 lines it is associated with repressed N₂-fixation. It was demonstrated for the first time that salt stress impairs the M. truncatula habitus (the mass: height ratio increased 2- to 6-fold), which in the salt-resistant cultivar Jemalong 6 is normalized as the result of rhizobia inoculation.
ISSN:1022-7954
1608-3369
DOI:10.1134/S1022795414060064