Journal Article10.1086/658156
Frankia assemblages associated with alnus rubra and alnus viridis are strongly influenced by host species identity
Adam Lipus,Peter G. Kennedy +1 more
TL;DR: It is indicated that host identity is a major factor influencing the genotype composition and abundance of Alnus-associated Frankia assemblages.
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Abstract: This study examined the effect of host species identity on the structure of Alnus-associated Frankia bacterial assemblages in the Pacific Northwest, United States, using two approaches. First, Frankia in nodules were sampled from six stands of Alnus rubra or Alnus viridis. Second, a bioassay was conducted where A. rubra and A. viridis seedlings were grown in different soils collected from these two hosts. Frankia genotypes were characterized with nifH sequences and bacterial assemblages were compared using taxon- and divergence-based analyses. Strong host associations were evident in the field; the dominant Frankia genotypes showed significant associations with either A. rubra or A. viridis, and there were host-associated groupings at the assemblage level as well. In the bioassay, host associations among Frankia genotypes were evident but less pronounced, reflecting an interaction between host species and other factors. Although nodule abundance varied among bioassay treatments, seedling dry mass was not ...
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Citations
Global biogeography of Alnus-associated Frankia actinobacteria
Sergei Põlme,Sergei Põlme,Mohammad Bahram,Urmas Kõljalg,Urmas Kõljalg,Leho Tedersoo,Leho Tedersoo +6 more
TL;DR: The results suggest that Alnus species exert strong phylogenetically determined selection pressure on compatible Actinobacteria in Frankia communities and their biogeographic patterns.
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•Journal Article
Variability of nitrogen-fixing Frankia on Alnus species [Erratum: 2009 Oct., v. 87, no. 10, p. 1011.]
TL;DR: Investigation of differences in the effect of nitrogen-fixing Frankia on Alnus species suggests that A. rugosa develops resistance to high lev...
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Symbiotic Frankia bacteria in Alnus forests in Mexico and the United States of America: is geographic location a good predictor of assemblage structure?
TL;DR: Genotype- and distance-based community analyses indicated that neither geographic location nor the phylogenetic relationships among hosts are strong predictors of Frankia assemblage structure, suggesting that factors other than classic biogeography are more influential in determining the continental-scale distribution and diver- sity of Alnus-associated Frankia.
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Patterns of diversity, endemism and specialization in the root symbiont communities of alder species on the island of Corsica
Adrien C. Pozzi,Mélanie Roy,Mélissande Nagati,Guillaume Schwob,Sophie Manzi,Monique Gardes,Pierre-Arthur Moreau,Maria P. Fernandez +7 more
TL;DR: Corsica is not a hotspot of diversity for all alder symbionts but sustains an increased frequency of poor-dispersers such as hypogeous fungi and host-dependent profusely sporulating Frankia were abundantly associated with Corsican A. cordata.
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Diversity of Frankia in root nodules of six Morella sp. from the Cape flora of South Africa
Dale A. Wilcox,Don A. Cowan +1 more
TL;DR: This study is the first to investigate the diversity of Frankia associated with endemic African actinorhizal species in their natural habitats, and to report isolated Frankia strains from African Morella.
References
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Frankia bacteria in Alnus rubra forests: genetic diversity and determinants of assemblage structure
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Variability of nitrogen-fixing Frankia on Alnus species
TL;DR: In this article, the effect of nitrogenfixing Frankia on Alnus species, spore-producing (sp+) nodules from alnus rubra Bong and A. crispa (Ait.) Turrill, A.incana subsp. rugosa (Du Roi) Clausen and non-spore producing (sp−) nodules were collected from each of four different populations and used to inoculate all three species.
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