Germination and physiological properties of Frankia spores

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

doi:10.1023/a:1024911231889

Cited by 20 publications

(16 citation statements)

References 36 publications

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“…However, the same condition did not increase sporulation of other two Frankia strains (18). Germination rates of Frankia spore were largely different depending on strains from less than 1% to 75% (48,108). Sporulation was stimulated by a gentle heat shock, low concentration of phenol, root extracts of a host plant (48), and some secondary plant products (108).…”

Section: Geneticsmentioning

confidence: 93%

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The Determinants of the Actinorhizal Symbiosis

Kucho

Hay²,

Normand³

2010

Microb. Environ.

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The actinorhizal symbiosis is a major contributor to the global nitrogen budget, playing a dominant role in ecological successions following disturbances. The mechanisms involved are still poorly known but there emerges the vision that on the plant side, the kinases that transmit the symbiotic signal are conserved with those involved in the transmission of the Rhizobium Nod signal in legumes. However, on the microbial side, complementation with Frankia DNA of Rhizobium nod mutants failed to permit identification of symbiotic genes. Furthermore, analysis of three Frankia genomes failed to permit identification of canonical nod genes and revealed symbiosis-associated genes such as nif, hup, suf and shc to be spread around the genomes. The present review explores some recently published approaches aimed at identifying bacterial symbiotic determinants.

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Section: Geneticsmentioning

confidence: 93%

“…Germination rates of Frankia spore were largely different depending on strains from less than 1% to 75% (48,108). Sporulation was stimulated by a gentle heat shock, low concentration of phenol, root extracts of a host plant (48), and some secondary plant products (108). Culture medium also affects germination efficiency (108).…”

Section: Geneticsmentioning

confidence: 99%

The Determinants of the Actinorhizal Symbiosis

Kucho

Hay²,

Normand³

2010

Microb. Environ.

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“…Increased rhizosphere soil-nodulation capacity of actinorhizal hosts and some other closely related plant species suggests the release of compounds that stimulate Frankia growth or infectious capacity or both (Zimpfer et al, 2002;2003). A compound from roots of an actinorhizal plant has been shown to stimulate Frankia spore germination (Krumholz et al, 2003). In order to determine the distribution of Frankia in nature, they must first be retrieved from soil or nodules and described to allow differentiation among genotypes.…”

Section: Global Distribution Of Frankia Taxamentioning

confidence: 99%

“…Host plants apparently release compounds that increase the numbers of infective Frankia in soil (Krumholz et al, 2003;Zimpfer et al, 1999;2003). Most actinorhizal plants are nodulated in their native habitats and Frankia is usually found in abundance in soils beneath nodulated host plants (Arveby and Huss-Danell, 1988;Oremus, 1980;Smolander, 1990;Van Dijk, 1979;Zimpfer et al, 1999).…”

Section: Biotic Factors Influencing Frankia In Soilmentioning

confidence: 99%

“…The increase in nodulation capacity caused by compounds released into plant rhizospheres may result from one or more of many possibilities, including: (i) the stimulation of Frankia growth; (ii) the stimulation of "helper" bacteria; (iii) the inhibition of competitors of Frankia; (iv) the enhancement of signaling by molecules important in the nodulation process; and (v) the stimulation of root-hair curling or fine-root production (Benoit and Berry, 1997;Gauthier et al, 2000;Kapulnik et al, 1987;Knowlton et al, 1980). In addition, Alnus and Elaeagnus root extracts increase Frankia spore germination (Krumholz 2003). Further, Alnus-infective Frankia can grow as saprophytes in incubated soils and the addition of Alnus leaves to incubated soils can increase both growth and infectivity of Alnus-infective strains of Frankia 2000).…”

Section: Biotic Factors Influencing Frankia In Soilmentioning

confidence: 99%

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Ecology Of Actinorhizal Plants

Dawson

Nitrogen Fixation: Origins, Applications, and Research Progress

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Diversity of Frankia Strains, Actinobacterial Symbionts of Actinorhizal Plants

2013

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In the last edition of the Bergey's Manual of Systematic Bacteriology, Frankia was the sole genus found in the family Frankiaceae. This single-genus family, together with Geodermatophilaceae, Nakamurellaceae, Sporichthyaceae, Acidothermaceae, and Cryptosporangiaceae, makes up the order Frankiales, an artificial taxon within the phylum Actinobacteria supported only marginally by 16S rDNA similarities (Normand and Benson 2012). Genus Frankia represents a monophyletic assemblage of soil actinobacteria distinguishable by multilocular sporangia-forming branched hyphae and their unique ability to grow in nitrogen-limited substrates due to their ability to fix nitrogen within specialized thick-walled structures, termed vesicles, produced in vitro and in planta. Diversity of Frankia has been noted in several separate reports on the presence of comparable root nodule structures induced in numerous trees and shrubs growing as aggressive pioneers in nitrogenlimited ecosystems such as glacial moraines, gravel slopes, volcanic ashes, mine spoils, or burned forests with a contributed input of 15 % of total biologically fixed nitrogen on earth (Quispel 1990). Despite the absence of apparent close kinship among these plants, they have been termed actinorhizal plants due to the nature of the root nodule-causing agents detected in plant tissues. Based on in planta morphology and the limited cross-infectivity of crushed-nodule inocula, Becking

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Germination and physiological properties of Frankia spores

Cited by 20 publications

References 36 publications

The Determinants of the Actinorhizal Symbiosis

The Determinants of the Actinorhizal Symbiosis

Ecology Of Actinorhizal Plants

Diversity of Frankia Strains, Actinobacterial Symbionts of Actinorhizal Plants

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