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Microbiol Mol Biol Rev. 1993 June; 57(2): 293-319

Biology of Frankia strains, actinomycete symbionts of actinorhizal plants.

D R Benson and W B Silvester

Department of Molecular and Cell Biology, University of Connecticut, Storrs 06269-3044.

SUMMARY

Frankia strains are N2-fixing actinomycetes whose isolation and cultivation were first reported in 1978. They induce N2-fixing root nodules on diverse nonleguminous (actinorhizal) plants that are important in ecological successions and in land reclamation and remediation. The genus Frankia encompasses a diverse group of soil actinomycetes that have in common the formation of multilocular sporangia, filamentous growth, and nitrogenase-containing vesicles enveloped in multilaminated lipid envelopes. The relatively constant morphology of vesicles in culture is modified by plant interactions in symbiosis to give a diverse array of vesicles shapes. Recent studies of the genetics and molecular genetics of these organisms have begun to provide new insights into higher-plant-bacterium interactions that lead to productive N2-fixing symbioses. Sufficient information about the relationship of Frankia strains to other bacteria, and to each other, is now available to warrant the creation of some species based on phenotypic and genetic criteria.

Microbiol Mol Biol Rev. 1993 June; 57(2): 293-319




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