Mycorrhizal associations of some actinomycete nodulated nitrogen-fixing plants

Rose, S. L.

doi:10.1139/b80-176

Cited by 72 publications

(28 citation statements)

References 15 publications

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“…In the field A. incana is colonized by one or both of ecto-and arbuscular-mycorrhiza (Harley & Harley, 1987;Rose, 1980). Plants in the present experiment were grown in non-sterilized sand.…”

Section: Mycorrhizal Effects On Nodulated Aldermentioning

confidence: 99%

Fungal biomass in roots and extramatrical mycelium in relation to macronutrients and plant biomass of ectomycorrhizal Pinus sylvestris and Alnus incana

et al. 1995

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SUMMARYWe studied the effects of macronutrients on the production and distribution of fungal biomass and plant biomass in ectomycorrhizai {Paxillus involutus (Fr.) Fr.) or non-mycorrhizal Pinus sylvestris L. and Alnus incana (L.) Moench, Fungal biomass was measured as ergosterol content in roots and extramatrical mycelium. Alnus incana was nodulated with Frankia. All six macronutrients were varied according to a two-level fractional factorial design. The plants were grown in pots during two growing periods in a growth chamber. Levels of N, P and sometimes K and interactions between tbem, had highly significant effects, whereas Ca, Mg and S bad no significant effects. The production of extramatrical mycelial biomass peaked when P was low and otber nutrients were high. This investment in extramatrical mycelium resulted in a 660 "" higber biomass in mycorrhizal compared witb nonmycorrhiza! P. sylvestris at this nutrient regime. The proportion of fungal biomass in roots was stable in P. svlvestris but more variable in A. incana. Alnus incana grew less when mycorrhizal then when non-mycorrhizal. The growtb responses to mycorrbiza and to the different nutrient treatments were evident at tbe end of tbe first growing period. Non-mycorrhizal P. sylvestris did not respond to P limitation by a production of proportionally more roots. Tbis migbt be a reflection of an obligate dependency on mycorrhiza for effective P uptake. By contrast, tbe root/shoot ratio in botb mycorrhizal and non-mycorrbizal P. sylvestris decreased strongly in response to increased N. The opposite root/sboot response was found in Alnus incana, and tbe ratio decreased strongly in response to increased P and increased in response to increased N.

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Section: Mycorrhizal Effects On Nodulated Aldermentioning

confidence: 99%

Fungal biomass in roots and extramatrical mycelium in relation to macronutrients and plant biomass of ectomycorrhizal Pinus sylvestris and Alnus incana

et al. 1995

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“…There are no detailed studies of Acaulospora and Gigaspora (El-Giahmi, Nicolson & the processes by which Casuarina roots become Daft, 1976;Rose, 1980;Daft, Clelland & Gardner, infected by AM fungi. By contrast, infection of 1985 ; Vasanthrakrishna & Bagyaraj, 1993).…”

Section: Actinorhizal Plants Such As Casuarina Can Formmentioning

confidence: 99%

Lack of competition between Frankia and Glomus for infection and colonization of roots of Casuarina equisetifolia (L.)

Sempavalan

Wheeler

Hooker³

1995

New Phytologist

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SUMMARYCasuarina equisetifolia (L.) seedlings, grown with a limiting supply of mineral N and P, were inoculated with either Frankia or Glomus fasciculatum E3 and subjected to delayed inoculation with the second microsymbiont.Comparison with seedhngs inoculated simultaneously with both microsymbionts showed that neither the development of nodules nor mycorrhizal colonization was delayed when seedling were pre-inoculated for periods of up to 60 d with either Glomus or Frankia, respectively.Mycorrhizal colonization was affected when inoculation with Frankia was delayed for 60 d. Thus, a 60 d delay in Frankia inoculation of G/owi/.s-inoculated seedlings resulted in a lower percentage mycorrhizal colonization of the root system than in seedlings inoculated earlier with Frankia or simultaneously with Gtomus. A similar delay in Glomus inoculation of Frankia-inoculated seedlings resulted in a 50",, reduction in the colonization of the roots with Glomus 60 d after inoculation. Delayed inoculation with either microsymbiont had no long-term effect on subsequent nodulation.Inhere was a highly significant, hnear relationship between log[j (nodule number per plant/ "o Glomus root colonization) and the time (days) after Frankia or Glomus inoculation, indicating a high degree of co-ordination between nodulation, mycorrhizal colonization and seedling growth in mineral deficient conditions.These data indicate a co-operative, but not a competitive interaction between Frankia and Gtomus for nodulation and mycorrhizal colonization of Casuarina.

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“…were present at a site that had not had Elaeagnus for many years (11), and Comptonia peregrina (cluster I Frankia host) seed was viable after being in a pine-dominated forest seed bank for more than 70 years (27). Alternatively, since Ceanothus and Cercocarpus support mycorrhizal symbiosis (28,29), the mycorrhizal mycelia may be a means of conveying a chemical signal.…”

Section: Discussionmentioning

confidence: 99%

The Influence of the Host Plant Is the Major Ecological Determinant of the Presence of Nitrogen-Fixing Root Nodule Symbiont Cluster II Frankia Species in Soil

Battenberg

Wren

Hillman³

et al. 2017

Appl Environ Microbiol

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The actinobacterial genus Frankia establishes nitrogen-fixing root nodule symbioses with specific hosts within the nitrogen-fixing plant clade. Of four genetically distinct subgroups of Frankia, cluster I, II, and III strains are capable of forming effective nitrogen-fixing symbiotic associations, while cluster IV strains generally do not. Cluster II Frankia strains have rarely been detected in soil devoid of host plants, unlike cluster I or III strains, suggesting a stronger association with their host. To investigate the degree of host influence, we characterized the cluster II Frankia strain distribution in rhizosphere soil in three locations in northern California. The presence/absence of cluster II Frankia strains at a given site correlated significantly with the presence/absence of host plants on the site, as determined by glutamine synthetase (glnA) gene sequence analysis, and by microbiome analysis (16S rRNA gene) of a subset of host/nonhost rhizosphere soils. However, the distribution of cluster II Frankia strains was not significantly affected by other potential determinants such as host-plant species, geographical location, climate, soil pH, or soil type. Rhizosphere soil microbiome analysis showed that cluster II Frankia strains occupied only a minute fraction of the microbiome even in the host-plant-present site and further revealed no statistically significant difference in the ␣-diversity or in the microbiome composition between the host-plantpresent or -absent sites. Taken together, these data suggest that host plants provide a factor that is specific for cluster II Frankia strains, not a general growthpromoting factor. Further, the factor accumulates or is transported at the site level, i.e., beyond the host rhizosphere.IMPORTANCE Biological nitrogen fixation is a bacterial process that accounts for a major fraction of net new nitrogen input in terrestrial ecosystems. Transfer of fixed nitrogen to plant biomass is especially efficient via root nodule symbioses, which represent evolutionarily and ecologically specialized mutualistic associations. Frankia spp. (Actinobacteria), especially cluster II Frankia spp., have an extremely broad host range, yet comparatively little is known about the soil ecology of these organisms in relation to the host plants and their rhizosphere microbiomes. This study reveals a strong influence of the host plant on soil distribution of cluster II Frankia spp.

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Mycorrhizal associations of some actinomycete nodulated nitrogen-fixing plants

Cited by 72 publications

References 15 publications

Fungal biomass in roots and extramatrical mycelium in relation to macronutrients and plant biomass of ectomycorrhizal Pinus sylvestris and Alnus incana

Fungal biomass in roots and extramatrical mycelium in relation to macronutrients and plant biomass of ectomycorrhizal Pinus sylvestris and Alnus incana

Lack of competition between Frankia and Glomus for infection and colonization of roots of Casuarina equisetifolia (L.)

The Influence of the Host Plant Is the Major Ecological Determinant of the Presence of Nitrogen-Fixing Root Nodule Symbiont Cluster II Frankia Species in Soil

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