Inoculation of Woody Legumes with Selected Arbuscular Mycorrhizal Fungi and Rhizobia To Recover Desertified Mediterranean Ecosystems

Herrera, M. A.; Salamanca, CP; Barea, José Miguel

doi:10.1128/aem.59.1.129-133.1993

Cited by 184 publications

(64 citation statements)

References 19 publications

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“…Several studies have demonstrated that rhizobial inoculation can increase various components of plant performance. Examples include the yield of cultivated legumes (Young & Mytton, 1983;Bergersen, 1987;Thies et al, 1991), seedling survival and growth in revegetation projects (Herrera et al, 1993;Jha et al, 1995), and the lifetime reproductive success of Amphicarpaea bracteata (L.) Fernald in a natural habitat in eastern North America not previously occupied by this species (Parker, 1995). A second prediction, from assumptions (1) and (2) together, is that introduced legume populations may occasionally go extinct if inoculated rhizobia fail to survive due to competition from indigenous soil organisms.…”

Section: Discussionmentioning

confidence: 99%

Mutualism as a constraint on invasion success for legumes and rhizobia

Parker

2001

Diversity and Distributions

127

113

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Because hereditary symbiont transmission is normally absent in the mutualism of legume plants and root‐nodule bacteria (rhizobia), dispersing plants may often arrive at new habitats where mutualist partners are too rare to provide full benefits. Factors governing invasion success were explored by analysing a system of two coupled pairwise competition models: a legume invader competing with a resident non‐mutualistic plant, and a rhizobial population competing with a resident population of nonsymbiotic bacteria. The non‐linear dependence of benefits on partner abundance in this mutualism creates the possibility of two alternative population size equilibria, so that a threshold density can exist for invasion. If legumes and rhizobia exceed a critical population size, both species achieve rapid population growth, while if initial densities of both species are below their respective thresholds, they remain rare and are thus vulnerable to extinction in the presence of competitors. Overall, the results indicate that legumes may often fail at colonization attempts within habitats where mutualist partners are scarce. Data on legume prevalence in island floras and rates of geographical spread by legume weeds are consistent with this inference. Predictive insights about invasiveness may emerge from comparative research on key traits identified by the model, especially the shape of the function determining the number of nodules formed at low rhizobial density.

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Section: Discussionmentioning

confidence: 99%

Mutualism as a constraint on invasion success for legumes and rhizobia

Parker

2001

Diversity and Distributions

127

113

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“…This process is physically mediated by mycorrhizal mycelia and glomalin, a glycoprotein of the hyphal wall (Miller & Jastrow 2000). Thus, the larger mycorrhizal mycelia associated with nurse species have an important effect in soil stabilization, which benefit species recruitment and accelerates succession in drylands and alpine ecosystems (Herrera, Salamanca & Barea 1993;Carrillo-Garc ıa et al 1999;Requena et al 2001;Ouahmane et al 2006;Casanova-Katny et al 2011;Duponnois et al 2011). In addition, soil aggregates contain water and nutritional resources that can protect micro-organisms from extreme conditions and affect microbial enzymatic activity (Six et al 2006;Bach & Hofmockel 2014).…”

Section: Soil Stabilizationmentioning

confidence: 99%

Influence of soil microbiota in nurse plant systems

2015

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Summary Facilitation by nurse plants is a key process involved in the organization of plant communities and maintenance of biodiversity, particularly in harsh environments. Nurse plants increase plant diversity and productivity in these ecosystems, but our knowledge on the mechanisms through which such facilitation operates is still expanding. Despite growing evidence that soil microbiota impact plant fitness and community dynamics, their role in plant facilitation has been little explored. Here, we synthesize available evidence on the effect of nurse plants on the abundance, composition and activity of soil microbial communities, and the effect of these soil communities on beneficiary plant species. Studies conducted mostly in arid and semi‐arid systems show that nurse plants promote the development of differentiated soil microbial communities characterized by a higher microbial abundance and activity, the dominance of competitive bacteria and larger mycorrhizal networks, compared to gaps and to coexisting non‐nurses. There is also evidence that differentiated soil microbiota associated with nurse plants has positive effects on the establishment, growth and fitness of beneficiary plant species, although the mechanisms involved remain unclear. We suggest that they include increased nutrient availability for plants, a better use of resources through functional complementarity in the microbial community, soil stabilization and also direct molecular signalling between soil microbes and plants that affect plant defence and plant interactions. Evidence for the role of soil microbiota as mediators of facilitation by nurse plants is growing, but there are still too few studies on which to draw generalizable conclusions. Future studies are needed to assess the effect of plant ontogeny and environmental conditions on soil microbial communities under nurse plants and other coexisting species, and to determine the microbial groups and specific mechanisms involved in facilitation by nurse plants.

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“…However, because many legume invasions derive from plants introduced for forestry or ornamental purposes, we cannot exclude the possibility that compatible rhizobial symbionts were co-introduced with their legume-hosts. Several studies have demonstrated that rhizobial inoculation can increase the yield of cultivated legumes (Bagyaraj et al, 1979;Young & Mytton, 1983) and seedling survival and growth in revegetation projects (Herrera et al, 1993;Rodríguez-Echeverría & Pérez-Fernández, 2005).…”

Section: Conclusion and Priorities For Future Workmentioning

confidence: 99%

Jack‐of‐all‐trades and master of many? How does associated rhizobial diversity influence the colonization success of Australian Acacia species?

Rodríguez‐Echeverría

Roux

Crisóstomo

et al. 2011

Diversity and Distributions

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Aim To evaluate the role of rhizobial diversity, and symbiotic promiscuity, on the invasive ability of Australian acacias (Acacia species in subgenus Phyllodineae native to Australia). Location Global. Methods A bibliographic review of the rhizobial diversity associated with Australian Acacia species was performed to assess symbiotic promiscuity for invasive and non‐invasive species. The rhizobial diversity associated with Acacia dealbata and A. saligna in Australia and Portugal and with A. pycnantha in Australia and South Africa was assessed by 16S rDNA and intergenic spacer sequencing of bacteria isolated from field‐collected nodules. Results All studied Australian acacias are nodulated by strains in the genus Bradyrhizobium, which appears to be the dominant group of acacia symbionts in native and non‐native soils. Both literature and experimental data from this study suggest that Australian bradyrhizobia might have been co‐introduced with acacias to new geographical regions. The studied Acacia species can also harbour other root‐nodulating alpha and betaproteobacteria genera, although these are less abundant than Bradyrhizobium. Main conclusions There is no clear difference in the diversity of rhizobial species associated with invasive and non‐invasive Australian acacias. All studied invasive acacias nodulate in both native and non‐native regions, harbouring predominantly Bradyrhizobium strains but showing some degree of symbiotic promiscuity. The co‐introduction of compatible root‐nodulating bacteria from Australia might explain the establishment of invasive populations, but novel associations with rhizobia from the invaded soils are also possible. Invasive legumes might use both strategies but species with low symbiotic promiscuity would become invasive only if compatible bacteria are co‐introduced in the new regions. The progress of invasion and the impacts on the invaded ecosystems might also differ depending on the nodulation strategy.

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Inoculation of Woody Legumes with Selected Arbuscular Mycorrhizal Fungi and Rhizobia To Recover Desertified Mediterranean Ecosystems

Cited by 184 publications

References 19 publications

Mutualism as a constraint on invasion success for legumes and rhizobia

Mutualism as a constraint on invasion success for legumes and rhizobia

Influence of soil microbiota in nurse plant systems

Jack‐of‐all‐trades and master of many? How does associated rhizobial diversity influence the colonization success of Australian Acacia species?

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