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Physiological and symbiotic characteristics of Rhizobium fredii isolated from subtropical-tropical soils
Authors:C. C. Young  J. Y. Chang  C. C. Chao
Affiliation:(1) Department of Soil Science, National Chung Hsing University, 40227 Taichung, Taiwan, Republic of China
Abstract:Summary Physiological and symbiotic characteristics were identified in Rhizobium fredii isolated from subtropical-tropical soils. The generation times of R. fredii Taiwan isolated-SB 357 and -SB 682 were 1.7 and 2.5 h, respectively. These strains were associated with acid production in yeast-extract mannitol medium. They were able to use hexoses, pentose, sucrose, trehalose and raffinose. Strain SB 357 can resist a high concentration of kanamycin (100 mgrg ml–1 and penicillin (400 mgrg ml–1). It can tolerate up to 2.34% NaCl and 1031.3 mosmol kg–1 (23.4 bars). The growth rate of R. fredii SB 357 under the concentration of approximately 450 mosmol kg–1 (10.2 bars) was not affected by salinity, but responded to osmotic pressure. Both strains (SB 357 and SB 682) isolated from subtropical-tropical soils were able to form an effective N2-fixing symbiosis with the US soybean cv Clark lanceolate leaflet.
Keywords:Rhizobia  Effective N2-fixation  Osmotic pressure  Symbiosis  Glycine max  Rhizobium fredii  Rhizobium japonicum
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