Stable isotope labelling reveals that NaCl stress decreases the production ofEnsifer(Sinorhizobium)arborislipochitooligosaccharide signalling molecules

Penttinen, Petri; Rásänen, Leena; Lortet, Gilles; Lindström, Kristina

doi:10.1111/1574-6968.12303

Cited by 6 publications

(2 citation statements)

References 35 publications

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“…However, increased salinity reduces Nod factor production by S. arboris , which nodulates Acacia and Prosopis , both of which are legume trees tolerant to salt stresses ( Penttinen et al, 2013 ). Similar effects were found for R. tropici and R. etli , which nodulate P. vulgaris ( Dardanelli et al, 2012 ).…”

Section: Environmental Effects On Signal Exchangementioning

confidence: 99%

Legume-rhizobia signal exchange: promiscuity and environmental effects

2015

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Although signal exchange between legumes and their rhizobia is among the best-known examples of this biological process, most of the more characterized data comes from just a few legume species and environmental stresses. Although a relative wealth of information is available for some model legumes and some of the major pulses such as soybean, little is known about tropical legumes. This relative disparity in current knowledge is also apparent in the research on the effects of environmental stress on signal exchange; cool-climate stresses, such as low-soil temperature, comprise a relatively large body of research, whereas high-temperature stresses and drought are not nearly as well understood. Both tropical legumes and their environmental stress-induced effects are increasingly important due to global population growth (the demand for protein), climate change (increasing temperatures and more extreme climate behavior), and urbanization (and thus heavy metals). This knowledge gap for both legumes and their environmental stresses is compounded because whereas most temperate legume-rhizobia symbioses are relatively specific and cultivated under relatively stable environments, the converse is true for tropical legumes, which tend to be promiscuous, and grow in highly variable conditions. This review will clarify some of this missing information and highlight fields in which further research would benefit our current knowledge.

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Section: Environmental Effects On Signal Exchangementioning

confidence: 99%

Legume-rhizobia signal exchange: promiscuity and environmental effects

2015

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“…. In liquid medium, AK23 and HAMBI 1552 tolerate 600 and 750 mmol l −1 NaCl, respectively , whereas Rm1021 grows poorly on LB agar with 400 mmol l −1 NaCl . The salt tolerance of STM 1064 was estimated by growing the strain in liquid M9 medium with 0, 600, and 800 mmol l −1 NaCl.…”

Section: Methodsmentioning

confidence: 99%

Divergent genes in potential inoculant Sinorhizobium strains are related to DNA replication, recombination, and repair

Penttinen

Greco

Muntyan

et al. 2016

J. Basic Microbiol.

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To serve as inoculants of legumes, nitrogen-fixing rhizobium strains should be competitive and tolerant of diverse environments. We hybridized the genomes of symbiotically efficient and salt tolerant Sinorhizobium inoculant strains onto the Sinorhizobium meliloti Rm1021 microarray. The number of variable genes, that is, divergent or putatively multiplied genes, ranged from 503 to 1556 for S. meliloti AK23, S. meliloti STM 1064 and S. arboris HAMBI 1552. The numbers of divergent genes affiliated with the symbiosis plasmid pSymA and related to DNA replication, recombination and repair were significantly higher than expected. The variation was mainly in the accessory genome, implying that it was important in shaping the adaptability of the strains.

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A synergistic interaction between salt-tolerant Pseudomonas and Mesorhizobium strains improves growth and symbiotic performance of liquorice (Glycyrrhiza uralensis Fish.) under salt stress

Egamberdieva

Lindström

et al. 2015

Appl Microbiol Biotechnol

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Chinese liquorice (Glycyrrhiza uralensis Fish.) is a salt-tolerant medicinal legume that could be utilized for bioremediation of salt-affected soils. We studied whether co-inoculation of the symbiotic Mesorhizobium sp. strain NWXJ19 or NWXJ31 with the plant growth-promoting Pseudomonas extremorientalis TSAU20 could restore growth, nodulation, and shoot/root nitrogen contents of salt-stressed G. uralensis, which was grown in potting soil and irrigated with 0, 50, and 75 mM NaCl solutions under greenhouse conditions. Irrigation with NaCl solutions clearly retarded the growth of uninoculated liquorice, and the higher the NaCl concentration (75 and 100 mM NaCl), the more adverse is the effect. The two Mesorhizobium strains, added either alone or in combination with P. extremorientalis TSAU20, responded differently to the salt levels used. The strain NWXJ19 was a good symbiont for plants irrigated with 50 mM NaCl, whereas the strain NWXJ31 was more efficient for plants irrigated with water or 75 mM NaCl solution. P. extremorientalis TSAU20 combined with single Mesorhizobium strains alleviated the salt stress of liquorice plants and improved yield and nodule numbers significantly in comparison with single-strain-inoculated liquorice. Both salt stress and inoculation raised the nitrogen content of shoots and roots. The nitrogen contents were at their highest, i.e., 30 and 35 % greater compared to non-stressed uninoculated plants, when plants were inoculated with P. extremorientalis TSAU20 and Mesorhizobium sp. NWXJ31 as well as irrigated with 75 mM NaCl solution. From this study, we conclude that dual inoculation with plant growth-promoting rhizobacteria could be a new approach to improve the tolerance of G. uralensis to salt stress, thereby improving its suitability for the remediation of saline lands.

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Stable isotope labelling reveals that NaCl stress decreases the production ofEnsifer(Sinorhizobium)arborislipochitooligosaccharide signalling molecules

Cited by 6 publications

References 35 publications

Legume-rhizobia signal exchange: promiscuity and environmental effects

Legume-rhizobia signal exchange: promiscuity and environmental effects

Divergent genes in potential inoculant Sinorhizobium strains are related to DNA replication, recombination, and repair

A synergistic interaction between salt-tolerant Pseudomonas and Mesorhizobium strains improves growth and symbiotic performance of liquorice (Glycyrrhiza uralensis Fish.) under salt stress

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