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. 1990 May;56(5):1342–1346. doi: 10.1128/aem.56.5.1342-1346.1990

Oligonucleotide Probes That Hybridize with rRNA as a Tool To Study Frankia Strains in Root Nodules

Dittmar Hahn 1,*, Marjo J C Starrenburg 1, Antoon D L Akkermans 1
PMCID: PMC184406  PMID: 16348187

Abstract

Oligonucleotide probes that hybridize with specific sequences in variable regions of the 16S rRNA of the nitrogen-fixing actinomycete Frankia were used for the identification of Frankia strains in nodules. Frankia cells were released from plant tissue by grinding glutaraldehyde-fixed root nodules in guanidine hydrochloride solution. rRNA was obtained after sonication, precipitation with ethanol, and purification by phenolchloroform extraction. Degradation of rRNA, evident in Northern blots, did not affect hybridization with the oligonucleotides. Nodules of about 1 mg (fresh weight) provided sufficient rRNA for reliable detection of the Frankia strain. The utility of this rRNA extraction method was tested in a competition experiment between two effective Frankia strains on cloned Alnus glutinosa plants.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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