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Cultural and Symbiotic Properties of Rhizobia from Egyptian Clover ( Trifolium alexandrinum )
Author(s) -
El Essawi T. M.,
Abdel Ghaffar A. S.
Publication year - 1967
Publication title -
journal of applied bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 0021-8847
DOI - 10.1111/j.1365-2672.1967.tb00309.x
Subject(s) - trifolium alexandrinum , rhizobia , red clover , biology , dry weight , symbiosis , agronomy , agar , botany , forage , bacteria , genetics
SUMMARY The morphological, cultural, biochemical and symbiotic properties of rhizobial strains isolated from Egyptian clover ( Trifolium alexandrinum ) were compared with those of strains from Denmark, England, Czechoslovakia and U.S.A. All were microscopically similar and showed normal growth on agar slopes, in broth and in milk. Some local but none of the foreign strains grew at 35° and in 5% NaCl solution. Differences in the reduction of nitrate, fermentation of carbohydrates and utilization of organic acids were apparent. Most Egyptian clover strains improved growth of the host plant, as measured by dry weight and nitrogen content. Egyptian clover strains formed only ineffective nodules on red clover ( T. pratense ). In general, Egyptian clover was effectively nodulated by foreign clover rhizobia.