Presence and dispersal of infective Frankia in peat and meadow soils in Sweden

Arveby, Agneta S.; Huss‐Danell, Kerstin

doi:10.1007/bf00257918

Cited by 47 publications

(28 citation statements)

References 15 publications

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“…*, nodules formed in a greenhouse in Seattle on C. cordulatus seedlings grown in field-collected soil as described in the text. 1 Ceanothus phylogenies based on molecular data (17) and morphological data (22) were both used as independent variables in separate CART analyses, but neither was significant in explaining Frankia phylogenetic groupings.…”

Section: Resultsmentioning

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: Resultsmentioning

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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“…Plant bioassays have demonstrated that members of the genus Frankia survive and remain infective in soils that are devoid of host plants (2,24,32,(42)(43)(44)(45)(46). This suggests that Frankia strains have the ability to grow in soil.…”

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confidence: 99%

Effect of Inoculation and Leaf Litter Amendment on Establishment of Nodule-Forming Frankia Populations in Soil

Nickel

Pelz

Hahn

et al. 2001

Appl Environ Microbiol

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High-N 2 -fixing activities of Frankia populations in root nodules on Alnus glutinosa improve growth performance of the host plant. Therefore, the establishment of active, nodule-forming populations of Frankia in soil is desirable. In this study, we inoculated Frankia strains of Alnus host infection groups I, IIIa, and IV into soil already harboring indigenous populations of infection groups (IIIa, IIIb, and IV). Then we amended parts of the inoculated soil with leaf litter of A. glutinosa and kept these parts of soil without host plants for several weeks until they were spiked with

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“…Even though Frankia is widely distributed in nature (Bond, 1976;Huss-Danell and Frej, 1986;Smolander and Sundman, 1987), surroundings without Frankia have been found (Houwers and Akkermans, 1981;Arveby and Huss-Danell, 1988;Smolander and Sundman, 1987;Smolander et al, 1988). In such Frankia-free locations, if forestation with actinorhizal trees is undertaken, inoculation with a proper Frankia would be needed.…”

Section: Discussionmentioning

confidence: 95%

Frankia-Alnus incana symbiosis: Effect of endophyte on nitrogen fixation and biomass production

1989

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The efficiency of different Finnish Frank& strains as symbionts on Alnus incana (L.) Moench was evaluated in inoculation experiments by measuring nitrogen fixation and biomass production. Since all available pure cultures of Frankia are of the Sp type (sporangia not formed in nodules), but the dominant nodule endophyte of A. incana in Finland is of the Sp § type (sporangia formed in nodules), crushed nodules of this Frankia type were included.The Sp-pure cultures, whether originating from A. incana or A. glutinosa, produced with one exception, similar biomass with A. incana. The highest biomass was produced with an American reference strain from A. viridis crispa. Using Sp § nodule homogenates from A. incana as inoculum, the biomass production was only one third of that produced by Sp pure cultures from the same host.Hence, through selection of the endophyte it is possible to exert a considerable influence on the productivity of Alnus incana.

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Presence and dispersal of infective Frankia in peat and meadow soils in Sweden

Cited by 47 publications

References 15 publications

Diversity and Distribution of Frankia Strains Symbiotic with Ceanothus in California

Diversity and Distribution of Frankia Strains Symbiotic with Ceanothus in California

Effect of Inoculation and Leaf Litter Amendment on Establishment of Nodule-Forming Frankia Populations in Soil

Frankia-Alnus incana symbiosis: Effect of endophyte on nitrogen fixation and biomass production

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