Adaptation of rhizobium to subarctic environment in Scandinavia

Ek-Jandér, Janet; Fåhræus, Gösta

doi:10.1007/bf02661846

Cited by 36 publications

(15 citation statements)

References 5 publications

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“…It is well established that the strain of Rhizobium plays an important role in determining the e¤ciency of nitrogen ¢xation at low temperature [52,53]. Many studies with rhizobia from temperate regions showed a relation between cold adaptation for growth in pure cultures and symbiotic e¡ectiveness (nodulation and nitrogenase activity) under cold conditions [41,54]. Psychrophilic arctic rhizobia in symbiosis with the temperate legume sainfoin expressed higher N 2 -¢xing activity and produced up to three times more shoot dry matter yield than temperate rhizobia at low temperatures and under ¢eld conditions, but were similar under optimal growth conditions [55,56].…”

Section: Discussionmentioning

confidence: 99%

Physiological adaptation to low temperatures of strains of Rhizobium leguminosarum bv. viciae associated with Lathyrus spp.

Drouin¹

2000

FEMS Microbiology Ecology

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Strains of Rhizobium leguminosarum bv. viciae, isolated from the legume species Lathyrus japonicus and Lathyrus pratensis in northern Quebec (Canada), showed different capacities for growing at low temperature. In the present study, we investigated some mechanisms related to cold adaptation. Two cold-adapted strains (psychrotrophs) were compared to a poorly adapted strain and to a cold-sensitive strain (reference strain) for freezing survival, protein induction and fatty acid composition under low temperature. Following cold shocks (25³C to 10, 5 and 0³C), a common 6.1-kDa CSP (cold shock protein) was induced in all strains, but the total number of CSPs synthesized at 0³C was higher in cold-adapted strains than in the cold-sensitive strain. The synthesis of CAPs (cold acclimation proteins) was observed under continuous growth at 5³C in all three strains capable of growth at this temperature. Levels of survival after 24 h at 380³C where higher in cold-(79%) and poorly adapted (64%) strains than in the cold-sensitive strain (33%), but a 2-h acclimation period at 5³C before freezing doubled the survival of the cold-sensitive strain. Low temperature conditions affected similarly the fatty acid composition of all strains, regardless of their cold adaptation level. The proportion of unsaturated fatty acids increased significantly with the lowering of growth temperature from 25 to 5³C, but showed a tendency to decrease after a cold shock from 25 to 5³C. A specific unsaturated fatty acid, cis-12 octadecanoic acid, was produced during growth at 5³C. The unsaturated cis-vaccenic acid was the principal component under all conditions. The cold adaptation trait was weakly reflected in symbiosis with the agronomic legume, Lathyrus sativus, with which one coldadapted strain showed a slightly higher nitrogenase activity and shoot dry matter yield than a commercial strain under a sub-optimal temperature regime. ß

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Section: Discussionmentioning

confidence: 99%

Physiological adaptation to low temperatures of strains of Rhizobium leguminosarum bv. viciae associated with Lathyrus spp.

Drouin¹

2000

FEMS Microbiology Ecology

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“…Coldtolerant strains of B. japonicum could be isolated from cold climates or created through genetic modification. Early research by Ek-Jander and Fahraeus (1971) found that performance of rhizobial strains at low RZT varied with geographic origin. Zhang et al (2003) evaluated 39 strains of B. japonicum originating from northern latitudes for their ability to grow at 15°C under laboratory conditions; these could be used to develop new inoculants.…”

Section: Commercially Available Rhizobial Inoculantsmentioning

confidence: 99%

Beneficial microorganisms for soybean (Glycine max (L.) Merr), with a focus on low root-zone temperatures

2015

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Background Heightened interest in biologically-based methods of raising crop yields has driven research into beneficial microorganisms that can be used to improve crop growth and productivity. Scope This review addresses the potential of rhizobia, vesicular-arbuscular mycorrhizae (VAM), and plantgrowth-promoting rhizobacteria to improve growth of soybean (Glycine max (L.) Merr) under temperate conditions. Mechanisms of action of beneficial microorganisms and considerations for utilization at all root-zone temperatures (RZTs) are reviewed. Subsequent sections address current knowledge on the inhibition of soybean growth at low RZTs and the potential of beneficial microorganisms to alleviate low temperature stress. Conclusions The three categories of beneficial microorganisms discussed differ in their modes of action and have shown potential for additive or synergistic growth promotion of soybean at all RZTs. At low RZT, pot and field studies have identified strains of rhizobia and PGPR, as well as certain phytohormones, that ameliorate the inhibitory effects of cold stress on soybean growth through a variety of mechanisms. Wider use of these treatments could aid the expansion of soybean cultivation in cold climates.

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“…nodule isolates from clover in sub-arctic Scandinavia; isolates from cowpea in the tropics (76,77). The geographical origin of the host plant is also important in determining temperature limits for nodulation.…”

Section: Temperaturementioning

confidence: 99%

Biochemical, physiological and environmental aspects of symbiotic nitrogen fixation

Dixon

Wheeler

1983

Biological Nitrogen Fixation in Forest Ecosystems: Foundations and Applications

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Adaptation of rhizobium to subarctic environment in Scandinavia

Cited by 36 publications

References 5 publications

Physiological adaptation to low temperatures of strains of Rhizobium leguminosarum bv. viciae associated with Lathyrus spp.

Physiological adaptation to low temperatures of strains of Rhizobium leguminosarum bv. viciae associated with Lathyrus spp.

Beneficial microorganisms for soybean (Glycine max (L.) Merr), with a focus on low root-zone temperatures

Biochemical, physiological and environmental aspects of symbiotic nitrogen fixation

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