Occurrence and infective potential of the endophyte ofHippophaë rhamnoides L. ssp.rhamnoides in coastal sand-dune areas

Oremus, P. A. I.

doi:10.1007/bf02197959

Cited by 31 publications

(21 citation statements)

References 16 publications

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“…Frankia dispersal is poorly understood, but known Frankia dispersal vectors include birds (31) and water (1). Frankia appears to be able to persist saprophytically in soils without a host plant (see, e.g., references 20, 25, and 26), and because it can remain viable when air dried (29), wind-borne dispersal may also be common.…”

Section: Discussionmentioning

confidence: 99%

Diversity and Distribution of Frankia Strains Symbiotic with Ceanothus in California

Oakley¹,

North

Franklin³

et al. 2004

Appl Environ Microbiol

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Frankia strains symbiotic with Ceanothus present an interesting opportunity to study the patterns and causes of Frankia diversity and distribution within a particular host infectivity group. We intensively sampled Frankia from nodules on Ceanothus plants along an elevational gradient in the southern Sierra Nevada of California, and we also collected nodules from a wider host taxonomic and geographic range throughout California. The two sampling scales comprised 36 samples from eight species of Ceanothus representing six of the seven major biogeographic regions in and around California. The primary objective of this study was to use a quantitative model to test the relative importance of geographic separation, host specificity, and environment in influencing the identity of Ceanothus Frankia symbionts as determined by ribosomal DNA sequence data. At both sampling scales, Frankia strains symbiotic with Ceanothus exhibited a high degree of genetic similarity. Frankia strains symbiotic with Chamaebatia (Rosaceae) were within the same clade as several Ceanothus symbionts. Results from a classification and regression tree model used to quantitatively explain Frankia phylogenetic groupings demonstrated that the only significant variable in distinguishing between phylogenetic groups at the more local sampling scale was host species. At the regional scale, Frankia phylogenetic groupings were explained by host species and the biogeographic province of sample collection. We did not find any significant correspondence between Frankia and Ceanothus phylogenies indicative of coevolution, but we concluded that the identity of Frankia strains inhabiting Ceanothus nodules may involve interactions between host species specificity and geographic isolation.Frankia strains are gram-positive, filamentous, N-fixing bacteria that form symbiotic relationships with 24 genera of host plants representing 8 families (2, 3). These actinorhizal plants are found throughout the world and serve an important function in many ecosystems as the major source of N, commonly a limiting nutrient (33, 34). Three main groups of Frankia have been classified based on host plant family: an Alnus (Betulaceae)/Myricaceae/Casuarinaceae group, an Eleagnaceae/Rhamnaceae group, and a third group which includes Frankia symbiotic with actinorhizal plants in the families Coriariaceae, Datiscaceae, and Rosaceae and the genus Ceanothus (Rhamnaceae) (9,27,35). These groupings only loosely correspond to host plant phylogenetic relationships, but they are generally consistent with the Frankia infection mode and phenotype (35). Frankia strains within a single host group also exhibit some degree of genetic heterogeneity, yet the patterns and causes of this heterogeneity are less well understood.For several reasons, Frankia strains symbiotic with Ceanothus present an interesting opportunity to study the patterns and causes of Frankia diversity within a particular host-group. First, Frankia strains from the seven actinorhizal genera in the family Rhamnaceae all group with Fr...

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Section: Discussionmentioning

confidence: 99%

Diversity and Distribution of Frankia Strains Symbiotic with Ceanothus in California

Oakley¹,

North

Franklin³

et al. 2004

Appl Environ Microbiol

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“…Field studies on nodulation of Hippophae in England (Stewart and Pearson, 1967) and The Netherlands (Akkermans, 1971;Oremus, 1980) (Zoon, 1986 …”

Section: Nematodesmentioning

confidence: 99%

“…; Houwers and Akkermans, 1981; Rodriguez- Barrueco, 1968) (van Dijk, 1984;Houwers and Akkermans, 1981;Maas et al, 1983;Oremus, 1980, Oremus andOtten, 1981 (Callaham et al, 1978 (Miller and Baker, 1986 (Baker, 1987 Stolk, 1984) and pure cultures of these ineffective strains have been described (Hahn et aL, 1988;Hahn et aL, 1989 (Lalonde, 1988 (Wallis and Reynolds, 1962;1965). In addition to the involvement of specific ectomycorrhizas, as described above, this phenomenon has also been explained by competition for available nitrogen.…”

mentioning

confidence: 97%

Interactions between root symbionts, root pathogens and actinorhizal plants

Akkermans¹,

Hahn²,

Zoon³

1989

Ann. For. Sci.

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“…Samples from uniform soils exhibit considerable variation in infective units of Frankia (Oremus, 1980;Zimpfer et al, 1997;1999), perhaps because of patchy favorable soil microhabitats, the localized release of Frankia from degrading nodules, localized stimulation of infective capacity by release of compounds from host plants and related genera, or the localized deposition by dispersal agents.…”

Section: Ecological Factors Influencing Infective Frankia Populationsmentioning

confidence: 99%

“…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). However, some actinorhizal genera are often sparsely nodulated or not nodulated at all even within their native habitats (Lawrie et al, 1982) and, therefore, probably contribute little to either host-plant success or the overall accumulation of soil nitrogen.…”

Section: Biotic Factors Influencing Frankia In Soilmentioning

confidence: 99%

Ecology Of Actinorhizal Plants

Dawson

Nitrogen Fixation: Origins, Applications, and Research Progress

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Occurrence and infective potential of the endophyte ofHippophaë rhamnoides L. ssp.rhamnoides in coastal sand-dune areas

Cited by 31 publications

References 16 publications

Diversity and Distribution of Frankia Strains Symbiotic with Ceanothus in California

Diversity and Distribution of Frankia Strains Symbiotic with Ceanothus in California

Interactions between root symbionts, root pathogens and actinorhizal plants

Ecology Of Actinorhizal Plants

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