Ecology Of Actinorhizal Plants

Dawson, Jeffrey O.

doi:10.1007/978-1-4020-3547-0_8

Cited by 70 publications

(47 citation statements)

References 159 publications

(197 reference statements)

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“…Prior to the availability of isolated Frankia strains, Becking (1970) proposed species status for the microsymbionts of each of the ten Dawson (2007) and Gtari and Dawson (2011) (continued) actinorhizal plant genera described at that time (Table 7.2). However, after Frankia isolates became available, inocula from crushed nodules were shown to be more restricted in their host plant ranges than isolated strains from nodules of similar plants (Lalonde 1979), as though host plant phenotypically "fixed" the microbial cells.…”

Section: Diversity Based On Host Plant Rangesmentioning

confidence: 99%

Diversity of Frankia Strains, Actinobacterial Symbionts of Actinorhizal Plants

2013

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In the last edition of the Bergey's Manual of Systematic Bacteriology, Frankia was the sole genus found in the family Frankiaceae. This single-genus family, together with Geodermatophilaceae, Nakamurellaceae, Sporichthyaceae, Acidothermaceae, and Cryptosporangiaceae, makes up the order Frankiales, an artificial taxon within the phylum Actinobacteria supported only marginally by 16S rDNA similarities (Normand and Benson 2012). Genus Frankia represents a monophyletic assemblage of soil actinobacteria distinguishable by multilocular sporangia-forming branched hyphae and their unique ability to grow in nitrogen-limited substrates due to their ability to fix nitrogen within specialized thick-walled structures, termed vesicles, produced in vitro and in planta. Diversity of Frankia has been noted in several separate reports on the presence of comparable root nodule structures induced in numerous trees and shrubs growing as aggressive pioneers in nitrogenlimited ecosystems such as glacial moraines, gravel slopes, volcanic ashes, mine spoils, or burned forests with a contributed input of 15 % of total biologically fixed nitrogen on earth (Quispel 1990). Despite the absence of apparent close kinship among these plants, they have been termed actinorhizal plants due to the nature of the root nodule-causing agents detected in plant tissues. Based on in planta morphology and the limited cross-infectivity of crushed-nodule inocula, Becking

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Section: Diversity Based On Host Plant Rangesmentioning

confidence: 99%

Diversity of Frankia Strains, Actinobacterial Symbionts of Actinorhizal Plants

2013

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“…Complex culture conditions coupled with prolonged doubling times often running into days have slowed down research into these unique organisms. But nevertheless, the contribution of the actinorhizal symbiosis, in terms of nitrogen fixation has been estimated to be as high as 25 % of the annual global nitrogen fixation in terrestrial ecosystems (Dawson 2008). The actinorhizal association begins with a compatible frankiae and host plant coming in contact.…”

Section: Xanthomonas Axonopodismentioning

confidence: 99%

Diversity Utility and Potential of Actinobacteria in the Agro-Ecosystem

Selvakumar

Panneerselvam

Ganeshamurthy

2014

Sustainable Development and Biodiversity

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“…Bacteria induce the formation of nodules on plant roots during both interactions. In the case of actinorhizal symbiosis, Gram-positive actinomycetous soil bacteria in the genus Frankia induce the formation of root nodules in [200 dicotyledonous plants from eight families (Dawson 2008;Gtari et al 2013). All of these host plants are perennial dicotyledons, and all except the genus Datisca are trees or shrubs.…”

Section: Introductionmentioning

confidence: 97%

“…A number of abiotic and biotic factors affect the freeliving and symbiotic properties of the Frankia-actinorhizal symbiosis, including moisture, aeration, temperature, pH, organic matter, inorganic chemicals, and the distributions of Frankia, and mycorrhizal fungi; excellent reviews have summarized these effects (Huss-Danell 1997;Dawson 2008;Valdés 2008;Põlme et al 2014). The growth responses of legumes to elevated CO 2 are occasionally constrained by factors other than N availability, such as P availability and water conditions (Hungate et al 2004;Reverchon et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Responses of symbiotic N2 fixation in Alnus species to the projected elevated CO2 environment

Tobita

Yazaki

Harayama

et al. 2015

Trees

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Key message Nitrogen fixation in Alnus species in response to elevated CO 2 may depend on the presence of non-N 2 -fixing tree species in addition to soil conditions. Abstract Alnus is a major genus of actinorhizal plants. Symbiosis with Frankia allows the Alnus species to fix nitrogen (N) at the rate of several to 320 kg N ha -1 year -1 with a nodule biomass of 16-480 kg ha -1 . Alnus species ensures an effective supply of N to soils because of the high N content of leaf litter, rapid decomposition rate, and the influx of herbivorous insects. In addition, the association between regenerated endozoochorous species and Alnus hirsuta suggests that N 2 fixation in Alnus species influences the distribution patterns of regenerated plants as well as improve soil fertility. N 2 fixation by the AlnusFrankia symbiotic relationship may be positively associated with elevated carbon dioxide (CO 2 ) levels. Nodule biomass increased under elevated CO 2 due to enhanced plant growth, rather than changes in biomass allocation. The inhibitory effect of high soil N on nodulation was retained under elevated CO 2 , and the effects of elevated CO 2 on N 2 fixation depended on soil P availability, drought, and many other abiotic and biotic factors. Recent free-air CO 2 enrichment experiments have demonstrated increased N 2 fixation in A. glutinosa exposed to elevated CO 2 in mixed-species stands containing non-N 2 -fixers but not in monocultures, suggesting that N 2 fixation depends on an association with non-N 2 -fixing tree species. Because elevated CO 2 can alter the N and P contents and stoichiometry of plants, it will be necessary to evaluate N allocation and accumulation of biomass when investigating the response of Alnus species to future global climate change.

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Ecology Of Actinorhizal Plants

Cited by 70 publications

References 159 publications

Diversity of Frankia Strains, Actinobacterial Symbionts of Actinorhizal Plants

Diversity of Frankia Strains, Actinobacterial Symbionts of Actinorhizal Plants

Diversity Utility and Potential of Actinobacteria in the Agro-Ecosystem

Responses of symbiotic N2 fixation in Alnus species to the projected elevated CO2 environment

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