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Studies on biological characteristics of frankia sp from hippophae rhamnoides


, : Studies on biological characteristics of frankia sp from hippophae rhamnoides. Weishengwu Xuebao 27(3): 227-232

Eight actinomycetous endophytes were isolated from the root nodules of Hippophae rhamnoides L. collected in the eastern district of Liaoning province. All of them have the typical morphological characteristics of Frankia, and infected and nodulated their hosts efficiently. The infecting abilities of these isolates are different from each other, and vary with the kinds of the solutions used for inoculating the seedlings of host. The strains isolated from two different districts showed different cultural characteristics when grown on the GyA medium. The strains tested can utilize a number of carbohydrates as sole C source. Among them, the pyruvate is found to be the best one. When the concentration of pyruvate used as sole C source is 10 mM in the Bap medium, the doubling time of Frankia sp. Hr16 can be dropped down to 40 h in the log period, and the maximum growth yield is reached in the two weeks after inoculation. The strain Hr16 showed the nitrogen-fixing activity in vitro in N-free medium, which was influenced apparently by the sort of C source in the N-free medium. 176.5 nmol C2H4/mg protein/h was assayed when the strain grown in the N-free Bap medium containing 5 mM pyruvate as sole C source.

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