Biology of Frankia strains, actinomycete symbionts of actinorhizal plants

Article Abstract:

Frankia strains which modulate actinorhizal plants constitute a group of soil actinomycetes facultatively symbiotic with higher plants. Differentiation of vessicles in culture and symbiosis and true participation in N2-fixation are essential features of the actinomycetes. Frankia cells enter symbiosis by root hair infection during which the hyphae become encapsulated with a layer of plant cell-wall-like material. Hyphae, sporangia and vesicles are the three structural forms of Frankia strains. Symbiotic Frankie strains have the major storage compounds-Glycozen and trehalose.

Symbiosis

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Amplification of 16S rRNA genes from Frankia strains in root nodules of Ceanothus griseus, Coriaria arborea, Coriaria plumosa, Discaria toumatou, and Purshia tridentata

Article Abstract:

Amplification of 16S rRNA sequences from plant-symbiotic nitrogen-fixing Frankia strains reveals identical sequences for nodules from Ceanothus griseus and P. tridentata and their resemblance to the endophyte of Dryas drummondii. The sequences for nodules from Coriaria arborea and Coriaria plumosa were identical along with a separate lineage. The Frankia strains in Discaria toumatou provide an exceptional sequence with a lineage close to bacteria infecting Elaeagnaceae. The amplification technique uses a very small amount of tissue and avoids digesting enzymes completely.

Ribosomal RNA, Nitrogen-fixing microorganisms

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Natural diversity of Frankia strains in actinorhizal root nodules from promiscuous hosts in the family Myricaceae

Article Abstract:

Research was conducted to examine the molecular diversity of Frankia species in plant root nodules using gene amplification and sequencing techniques. The gene sequence data from three host plants indicate that the distribution frequency varies greatly.

United States, Analysis, Environmental aspects, Fungi, Statistics (Mathematics), Mathematical statistics, Gene frequency

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