Molecular phylogeny of Alnus (Betulaceae), inferred from nuclear ribosomal DNA ITS sequences

Navarro, Elisabeth; Bousquet, Jean; Moiroud, A.; Munive, Antonio; Piou, Dominique; Normand, Philippe

doi:10.1007/978-94-017-1601-7_22

Cited by 22 publications

(27 citation statements)

References 25 publications

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“…Alternatively, this apparent reciprocal speciWcity may represent genetic diVerences between alder species and/or among Frankia genotypes in the range of symbiotic partners with which they are compatible. Large such diVerences between the host species in this study would be congruent with the large phylogenetic distance between them (Chen and Li 2004;Navarro et al 2003). InterspeciWc host-symbiont speciWcity in Alnus is apparent in some cross-inoculation studies (Du and Baker 1992;Weber 1990;van Dijk et al 1988;Weber et al 1987), and genetic variation even within a host species may aVect the level of infection by speciWc symbiont genotypes (van Dijk and Sluimer 1994).…”

Section: Discussionmentioning

confidence: 62%

Host species and habitat affect nodulation by specific Frankia genotypes in two species of Alnus in interior Alaska

et al. 2009

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Alders (Alnus spp.) are important components of northern ecosystems due to their ability to fix nitrogen (N) in symbiosis with Frankia bacteria. Availability of optimal Frankia may be a contributing factor in limiting the performance and ecological effects of Alnus, but the factors underlying distribution of Alnus-infective Frankia are not well understood. This study examined the genetic structure (nifD-K spacer RFLP haplotypes) of Frankia assemblages symbiotic with two species of Alnus (A. tenuifolia and A. viridis) in four successional habitats in interior Alaska. We used one habitat in which both hosts occurred to observe differences between host species independent of habitat, and we used replicate sites for each habitat and host to assess the consistency of symbiont structure related to both factors. We also measured leaf N content and specific N-fixation rate (SNF) of nodules ((15)N uptake) to determine whether either covaried with Frankia structure, and whether Frankia genotypes differed in SNF in situ. Frankia structure differed between sympatric hosts and among habitats, particularly for A. tenuifolia, and was largely consistent among replicate sites representing both factors. Leaf N differed between host species and among habitats for both hosts. SNF did not differ among habitats or host species, and little evidence for differences in SNF among Frankia genotypes was found, due largely to high variation in SNF. Consistency of Frankia structure among replicate sites suggests a consistent relationship between both host species and habitat among these sites. Correlations with specific environmental variables and possible underlying mechanisms are discussed.

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Section: Discussionmentioning

confidence: 62%

Host species and habitat affect nodulation by specific Frankia genotypes in two species of Alnus in interior Alaska

et al. 2009

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“…The study focused on Alnus rubra and Alnus viridis, two regionally abundant host species that belong to different Alnus subgenera (Navarro et al 2003;Chen and Li 2004). We first determined whether A. rubra and A. viridis support different Frankia assemblages in natural settings (hereafter referred to as the field study).…”

Section: Introductionmentioning

confidence: 99%

FrankiaAssemblages Associated withAlnus rubraandAlnus viridisAre Strongly Influenced by Host Species Identity

Lipus

Kennedy

2011

International Journal of Plant Sciences

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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 divergencebased 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 strongly correlated with either nodule quantity or soil chemistry. Collectively, our observation and experimental results indicate that host identity is a major factor influencing the genotype composition and abundance of Alnus-associated Frankia assemblages.

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“…Bold indicates dominant pore numbers. For charts with more inclusive and up-to-date alder phylogeny, see Navarro et al (2003) and Chen and Li (2004); for example, Chen and Li (2004) Palynology 183 as exemplified in pollen of Alnus glutinosa (L.) Gaertner and Alnus sieboldiana Matsumura. The number of pores may be variable within an Alnus species but four and five pores are the most common.…”

Section: Description Of Alder Pollen and Poresmentioning

confidence: 99%

“…Alnus sieboldiana is referred to by Ina (1992) as the equivalent of leaf ''fossil species C'' from the eastern part of the Miocene Setouchi province in Japan and it may also have contributed to hybridization. In a study of molecular phylogeny (for the reconstruction of the phylogeny of plant genera), sequencing ambiguities due to two polymorphic alleles in Alnus sieboldiana were interpreted as evidence that interspecific hybridization is common (Navarro et al 2003). Alnus sieboldiana, is, however, a warm temperate tree with a modern distribution in eastern Asia including sites along the Pacific coast in Japan (Kitamura and Murata 1979), and may therefore be less of a contributor in a cooling Pliocene climate (Barron and Baldauf 1990).…”

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confidence: 99%

Variations in alder pollen pore numbers—a possible new correlation tool for the Neogene Kenai lowland, Alaska

Reinink-Smith

2010

Palynology

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Molecular phylogeny of Alnus (Betulaceae), inferred from nuclear ribosomal DNA ITS sequences

Cited by 22 publications

References 25 publications

Host species and habitat affect nodulation by specific Frankia genotypes in two species of Alnus in interior Alaska

Host species and habitat affect nodulation by specific Frankia genotypes in two species of Alnus in interior Alaska

FrankiaAssemblages Associated withAlnus rubraandAlnus viridisAre Strongly Influenced by Host Species Identity

Variations in alder pollen pore numbers—a possible new correlation tool for the Neogene Kenai lowland, Alaska

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