Plasmid content of salt stress-tolerant <Emphasis Type="Italic">Rhizobium</Emphasis> strains from Egyptian soils nodulating common bean (<Emphasis Type="Italic">Phaseolus vulgaris</Emphasis> L.) |
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Authors: | Abdelaal Shamseldin |
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Institution: | (1) Environmental Biotechnology Department, Genetic Engineering and Biotechnology Research Institute, Mubarak City for Scientific Research and Technological Applications, P.O. Box: 21934, New Borg El-Arab City, Alexandria, Egypt |
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Abstract: | Plasmid profile analysis is useful to characterize Rhizobium strains within the same species. Among the 16 Rhizobium strains examined, 14 had distinct plasmid profiles. The size of plasmids ranged from 40 to 650 kb, and three plasmids of
650, 510 and 390 kb were common to several strains. Plasmid analysis revealed that Rhizobium etli contained a mega-plasmid, similar in size to Rhizobium tropici. All the salt-tolerant strains examined had a plasmid of 250 kb, except for strain EBRI 29. This suggests that this plasmid
may play an important adaptive role under salt stress conditions. |
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Keywords: | Common bean Plasmid DNA Rhizobium Salt stress |
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