The nodule bacteria Sinorhizobium meliloti are mutualistic
symbionts of alfalfa, which has a wide area of distribution, including the zone
of arid agriculture, the soils of which are subject to salinization. S.
meliloti, as typical saprophytes, are found in soils of different types and
degree of salinity. Therefore, rhizobia must have a gene pool that determines
their ability to adapt to different conditions. This paper presents the first
results of phylogenetic analysis of genes involved in primary and secondary
responses to the stress factor salinity. Analysis of 26 S. meliloti strains for
which full genomic data are available showed that the pSymA replicon, on which
the genes essential for symbiotic nitrogen-fixing activity are localized, also
plays a significant role in the formation of the gene pool associated with
tolerance to salinity stress. The identification of the closest putative
phylogenetic relatives for all 14 genes studied allowed, for the first time, to
gain insight into the evolutionary pathway of stress-related gene pool formation
in nodule bacteria forming nitrogen-fixing symbiosis with leguminous plants.
Author(s) Details:
Victoria Spartakovna Muntyan,
Laboratory of Genetics and Selection of Microorganisms, Federal
State Budget Scientific Institution All-Russia Research Institute for
Agricultural Microbiology (FSBSI ARRIAM), 196608 Saint Petersburg, Russia.
Marina
Lvovna Roumiantseva,
Laboratory
of Genetics and Selection of Microorganisms, Federal State Budget Scientific
Institution All-Russia Research Institute for Agricultural Microbiology (FSBSI
ARRIAM), 196608 Saint Petersburg, Russia.
Please see the link here: https://stm.bookpi.org/RACAS-V6/article/view/14144
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