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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.
Russian Journal of Genetics – Springer Journals
Published: Jul 24, 2014
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