Conditions for successful Rhizobium-legume symbiosis in saline environments

Zahran, H. H.

doi:10.1007/bf00369391

Cited by 80 publications

(46 citation statements)

References 99 publications

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“…Unlike rhizobia, legume-rhizobium symbiosis and nodule formation on legumes are more sensitive to salt (Zahran 1991). Salt stress not only inhibits the initial steps of nodule formation, but also affects nitrogen fixation of legumes (Delgado and others 1994;Nair and others 1993;Salwa and others 2005).…”

Section: Discussionmentioning

confidence: 99%

Synergistic Interactions Between Salt-tolerant Rhizobia and Arbuscular Mycorrhizal Fungi on Salinity Tolerance of Sesbania cannabina Plants

Ren

Bai

Chen

et al. 2016

J Plant Growth Regul

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Legumes can host rhizobia and mycorrhizal fungi, and this triple symbiosis might be exploited to improve saline soil fertility. Therefore, a greater understanding of the interaction of rhizobia and arbuscular mycorrhizal fungus during legume growth in saline soil is required. We investigated the efficiency of salt tolerance conferred by rhizobia in mycorrhizal Sesbania cannabina. Greenhouse experiments were conducted in which S. cannabina plants inoculated with Glomus mosseae BGC NM03D (GM), and two rhizobia strains Agrobacterium pusense YIC4105 (4105) and Neorhizobium huautlense YIC4083 (4083), were exposed to 100 and 200 mM NaCl. Under 200 mM NaCl stress, plants inoculated with 4105, rather than 4083, showed significant increases in shoot and root dry mass compared with non-inoculated plants. Simultaneously, a significant increase over GM-inoculated plants in mycorrhizal colonization and dependency was recorded for 4105 ? GM-inoculated plants compared with 4083 ? GM-inoculated plants. In addition, under NaCl stress, significant increases in the number and mass of nodules, nitrogenase activity, and leghemoglobin content of nodules occurred in 4105 ? GM-inoculated plants compared with 4083 ? GM-inoculated plants. Furthermore, the activities of antioxidant enzymes in rhizobiainoculated plants were significantly higher in the GM ? 4105 group than the 4083 ? GM group. The malondialdehyde content of plants from the 4105 ? GM group was significantly lower than in the 4083 ? GM group. Thus, the results revealed a synergistic relationship among the 4105 and GM in alleviating salt stress in S. cannabina. Salt-tolerant rhizobia might improve the salinity tolerance of S. cannabina by enhancing the antioxidant system.

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Section: Discussionmentioning

confidence: 99%

Synergistic Interactions Between Salt-tolerant Rhizobia and Arbuscular Mycorrhizal Fungi on Salinity Tolerance of Sesbania cannabina Plants

Ren

Bai

Chen

et al. 2016

J Plant Growth Regul

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“…The Rhizobium-legume symbiosis is more sensitive to salt or osmotic stress than the free-living rhizobia are (12,65). Salt stress may inhibit the initial steps of the symbiosis (root colonization and infection and nodule development), but it also has a depressive effect on nitrogen fixation (66).…”

mentioning

confidence: 99%

Transcriptome Profiling Reveals the Importance of Plasmid pSymB for Osmoadaptation of Sinorhizobium meliloti

et al. 2006

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In this work, DNA microarrays were used to investigate genome-wide transcriptional responses of Sinorhizobium meliloti to a sudden increase in external osmolarity elicited by addition of either NaCl or sucrose to exponentially growing cultures. A time course of the response within the first 4 h after the osmotic shock was established. We found that there was a general redundancy in the differentially expressed genes after NaCl or sucrose addition. Both kinds of stress resulted in induction of a large number of genes having unknown functions and in repression of many genes coding for proteins with known functions. There was a strong replicon bias in the pattern of the osmotic stress response; whereas 64% of the upregulated genes had a plasmid localization, 85% of the downregulated genes were chromosomal. Among the pSymB osmoresponsive genes, 83% were upregulated, suggesting the importance of this plasmid for S. meliloti osmoadaptation. Indeed, we identified a 200-kb region in pSymB needed for adaptation to saline shock which has a high density of osmoregulated genes.

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“…The legume-Rhizobium symbioses and nodule formation on legumes are more sensitive to salt or osmotic stress than are the rhizobia (Zahran, 1991). Salt stress inhibits the initial steps of Rhizobium-legume symbiosis.…”

Section: Changes Of Physical and Chemical Properties Of The Soils Andmentioning

confidence: 99%

Effect of Rhizobium and Intercropping Systems on Soil Nutrients and Biological Nitrogen Fixation as Influenced by Legumes (Phaseolus vulgaris and Dolichos lablab)

Massawel¹,

Mtei²,

Ndakidemi³

2016

Int.J.Curr.Microbiol.App.Sci

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Conditions for successful Rhizobium-legume symbiosis in saline environments

Cited by 80 publications

References 99 publications

Synergistic Interactions Between Salt-tolerant Rhizobia and Arbuscular Mycorrhizal Fungi on Salinity Tolerance of Sesbania cannabina Plants

Synergistic Interactions Between Salt-tolerant Rhizobia and Arbuscular Mycorrhizal Fungi on Salinity Tolerance of Sesbania cannabina Plants

Transcriptome Profiling Reveals the Importance of Plasmid pSymB for Osmoadaptation of Sinorhizobium meliloti

Effect of Rhizobium and Intercropping Systems on Soil Nutrients and Biological Nitrogen Fixation as Influenced by Legumes (Phaseolus vulgaris and Dolichos lablab)

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