Diversity of Frankia strains in root nodules of plants from the families elaegnaceae and Rhamnaceae

Article Abstract:

Research was conducted to examine the diversity and relationships among Frankia that infect family Rhamnaceae members. Partial and full-length 16S rDNAs from Frankia microsymbionts living in root nodules of Elaeagnaceae and Rhamnaceae families were isolated and sequenced. The close relationship between strains of Frankia that infect most plants belonging to the Elaeagnaceae and Rhamnaceae families indicate that the last common ancestor of both families was nodulated by Frankia strains similar to those occupying the nodules.

Symbiosis, Recombinant DNA

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Variability among Rhizobium strains originating from nodules of Vicia faba

Article Abstract:

The tests of multilocus gel electrophoresis and restriction length polymorphism on Rhizobium strains taken from nodules of Vicia faba, detected the diversity in plasmid content and serology, and various deep chromosomal lineages in the strains. The Rhizobium strains originating from different geographical locations are different, and are explained by the linkage disequilibrium between the chromosomal types. This tendency supports a low incidence of genetic recombination.

Analysis, Observations, Rhizobium, Plasmids, Serology

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Ethylene production by root nodules and effect of ethylene on nodulation in Glycine max

Article Abstract:

More ethylene is produced by nodulated soybean roots, and they contain more 1-aminocyclopropane-1-carboxylic acid as compared to uninoculated roots. The plant portion of the nodules is responsible for ethylene production by the nodules. The soybean B. japonilcum system is not as sensitive to the effects of ethylene as the rhizobium systems. Nodulation in soybeans is not affected by low and intermediate levels of ethylene.

Organic compound synthesis, Ethylene

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