Germination and physiological properties of Frankia spores

Krumholz, Glenn D.; Chval, Matthew S.; McBride, Mark J.; Tisa, Louis S.

doi:10.1007/978-94-017-1601-7_7

Cited by 5 publications

(1 citation statement)

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“…While filamentous hyphae are the primary vegetative state for all growing Frankia strains, the extent of sporangia and vesicle formation varies from cluster to cluster. The sporulation of strains from clusters 1, 3, and 4 may be readily detected in vitro or may depend on the composition of media and cultural conditions ( Tisa et al, 1983 ; Krumholz et al, 2003 ). The sporulation of the two cultivated strains of cluster 2 seems to be completely suppressed ( Gtari et al, 2015 ; Nouioui et al, 2017b ).…”

Section: Resultsmentioning

confidence: 99%

Taxogenomic status of phylogenetically distant Frankia clusters warrants their elevation to the rank of genus: A description of Protofrankia gen. nov., Parafrankia gen. nov., and Pseudofrankia gen. nov. as three novel genera within the family Frankiaceae

Gtari

2022

Front. Microbiol.

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The genus Frankia is at present the sole genus in the family Frankiaceae and encompasses filamentous, sporangia-forming actinomycetes principally isolated from root nodules of taxonomically disparate dicotyledonous hosts named actinorhizal plants. Multiple independent phylogenetic analyses agree with the division of the genus Frankia into four well-supported clusters. Within these clusters, Frankia strains are well defined based on host infectivity range, mode of infection, morphology, and their behaviour in culture. In this study, phylogenomics, overall genome related indices (OGRI), together with available data sets for phenotypic and host-plant ranges available for the type strains of Frankia species, were considered. The robustness and the deep radiation observed in Frankia at the subgeneric level, fulfilling the primary principle of phylogenetic systematics, were strengthened by establishing genome criteria for new genus demarcation boundaries. Therefore, the taxonomic elevation of the Frankia clusters to the rank of the genus is proposed. The genus Frankia should be revised to encompass cluster 1 species only and three novel genera, Protofrankia gen. nov., Parafrankia gen. nov., and Pseudofrankia gen. nov., are proposed to accommodate clusters 2, 3, and 4 species, respectively. New combinations for validly named species are also provided.

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