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

Nickel, Anja; Pelz, Oliver; Hahn, Dittmar; Saurer, Matthias; Siegwolf, Rolf; Zeyer, Josef

doi:10.1128/aem.67.6.2603-2609.2001

Cited by 41 publications

(29 citation statements)

References 54 publications

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“…Frankia spp. are known to survive and remain infective in soil devoid of host plants (Nickel et al, 2001;Ridgway et al, 2004). Nonetheless, these results indicate good performance of Frankia-nodulated alders in OSPM and that planting alders to improve soil characteristics is a viable approach to enhance revegetation.…”

Section: Discussionmentioning

confidence: 92%

Field performance of alder-Frankia symbionts for the reclamation of oil sands sites

Lefrançois

Quoreshi

Khasa

et al. 2010

Applied Soil Ecology

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Section: Discussionmentioning

confidence: 92%

Field performance of alder-Frankia symbionts for the reclamation of oil sands sites

Lefrançois

Quoreshi

Khasa

et al. 2010

Applied Soil Ecology

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“…In our previous analyses, only one group of frankiae, i.e., subgroup II of the Alnus host infection group represented by strain Ag45/Mut15, was detected by qPCR in both nodules on A. glutinosa and in soils, though with numbers in soils that corresponded largely to those retrieved for nitrogen-fixing frankiae [19]. This subgroup was dominant apparently independent of environmental characteristics such as organic matter content and matric potential that had been shown to affect the development of specific Frankia populations [9][10][11]31]. Our current analyses detected three of our four target subgroups within the genus demonstrating the potential of our qPCRbased quantification procedure for population analyses in soils.…”

Section: Rbwmentioning

confidence: 93%

“…In the absence of plants, amendment of soils with slowly available C resources such as leaf litter affected the nodulation capacity of different Frankia strains [11] and allowed growth of a small number of strains only, all of which belonged to a distinct phylogenetic cluster within the Alnus host infection group [9,10]. Casuarina-infective strains, another distinct phylogenetic cluster within the Alnus host infection group [12,13], also grew saprotrophically, however, only in the rhizosphere of their host plant [10] or with leaf litter of Casuarina sp.…”

Section: Introductionmentioning

confidence: 99%

Abundance and Relative Distribution of Frankia Host Infection Groups Under Actinorhizal Alnus glutinosa and Non-actinorhizal Betula nigra Trees

et al. 2015

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Quantitative polymerase chain reaction (qPCR) was used to assess the abundance and relative distribution of host infection groups of the root-nodule forming, nitrogen-fixing actinomycete Frankia in four soils with similar physicochemical characteristics, two of which were vegetated with a host plant, Alnus glutinosa, and two with a non-host plant, Betula nigra. Analyses of DAPI-stained cells at three locations, i.e., at a distance of less than 1 m (near stem), 2.5 m (middle crown), and 3-5 m (crown edge) from the stems of both tree species revealed no statistically significant differences in abundance. Frankiae generally accounted for 0.01 to 0.04 % of these cells, with values between 4 and 36 × 10(5) cells (g soil)(-1). In three out of four soils, abundance of frankiae was significantly higher at locations "near stem" and/or "middle crown" compared to "crown edge," while numbers at these locations were not different in the fourth soil. Frankiae of the Alnus host infection group were dominant in all samples accounting for about 75 % and more of the cells, with no obvious differences with distance to stem. In three of the soils, all of these cells were represented by strain Ag45/Mut15. In the fourth soil that was vegetated with older A. glutinosa trees, about half of these cells belonged to a different subgroup represented by strain ArI3. In all soils, the remaining cells belonged to the Elaeagnus host infection group represented by strain EAN1pec. Casuarina-infective frankiae were not found. Abundance and relative distribution of Frankia host infection groups were similar in soils under the host plant A. glutinosa and the non-host plant B. nigra. Results did thus not reveal any specific effects of plant species on soil Frankia populations.

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“…Some evidence suggests that active Frankia populations in the soil may be preferentially selected by the host for nodulation (33,36). Previous research in our laboratory has confirmed the importance of the plant host in selecting Frankia strains for symbiosis when the same soil was inoculated into six different actinorhizal plant species and resulted in six different diversity profiles (34).…”

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confidence: 65%

Diversity of Frankia Populations in Root Nodules of Geographically Isolated Arizona Alder Trees in Central Arizona (United States)

Welsh

Dawson

Gottfried

et al. 2009

Appl Environ Microbiol

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The diversity of uncultured Frankia populations in root nodules of Alnus oblongifolia trees geographically isolated on mountaintops of central Arizona was analyzed by comparative sequence analyses of nifH gene fragments. Sequences were retrieved from Frankia populations in nodules of four trees from each of three mountaintops (n ‫؍‬ 162) and their levels of diversity compared using spatial genetic clustering methods and single-nucleotide or 1, 3, or 5% sequence divergence thresholds. With the single-nucleotide threshold level, 45 different sequences with significant differences between the mountaintops were retrieved, with the southern site partitioning in a separate population from the two other sites. Some of these sequences were identical in nodules from different mountaintops and to those of strains isolated from around the world. A high level of diversity that resulted in the assignment of 14 clusters of sequences was also found on the 1% divergence level. Single-nucleotide and 1% divergence levels thus demonstrate microdiversity of frankiae in root nodules of A. oblongifolia trees and suggest a partitioning of diversity by site. At the 3 and 5% divergence levels, however, diversity was reduced to three clusters or one cluster, respectively, with no differentiation by mountaintop. Only at the 5% threshold level do all Frankia strains previously assigned to one genomic group cluster together.

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

Cited by 41 publications

References 54 publications

Field performance of alder-Frankia symbionts for the reclamation of oil sands sites

Field performance of alder-Frankia symbionts for the reclamation of oil sands sites

Abundance and Relative Distribution of Frankia Host Infection Groups Under Actinorhizal Alnus glutinosa and Non-actinorhizal Betula nigra Trees

Diversity of Frankia Populations in Root Nodules of Geographically Isolated Arizona Alder Trees in Central Arizona (United States)

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