Impact of water regimes on an experimental community of four desert arbuscular mycorrhizal fungal (AMF) species, as affected by the introduction of a non-native AMF species

Symanczik, Sarah; Courty, Pierre‐Emmanuel; Boller, Thomas; Wiemken, A.; Al-Yahya’ei, Mohamed N.

doi:10.1007/s00572-015-0638-3

Cited by 57 publications

(36 citation statements)

References 65 publications

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“…Approaches based on isolate-specific targets offer greater promise but are less common. Again, studies using this approach have shown variable outcomes (Farmer et al, 2007;Symanczik, Courty, Boller, Wiemken, & Al-Yahya'ei, 2015). While Köhl, Lukasiewicz, and Van der Heijden (2016) showed Rhizophagus irregularis establishment in a field soil microcosm, they did not measure persistence past 8 weeks.…”

Section: Tracking Specific Inoculantsmentioning

confidence: 99%

“…One of the few consistent lines of evidence is that inoculation can change AMF communities, leading to partial (Koch et al, 2011;Symanczik et al, 2015) or complete replacement of resident fungi (Jin, Germida, & Walley, 2013;Pellegrino et al, 2012;Symanczik et al, 2015). Not surprisingly, the degree to which an inoculant dominates F I G U R E 3 Knowledge gaps and future research priorities for arbuscular mycorrhizal fungi (AMF) inoculants depends on the context.…”

Section: Amf Biodiversitymentioning

confidence: 99%

“…Not surprisingly, the degree to which an inoculant dominates F I G U R E 3 Knowledge gaps and future research priorities for arbuscular mycorrhizal fungi (AMF) inoculants depends on the context. For example, AMF with r-life-history strategies inoculated into communities of K-strategists could displace resident fungi (Abbott et al, 1983) particularly in disturbed or stressful conditions (Symanczik et al, 2015). Abiotic factors can also influence inoculant dominance-inoculants may fail to establish effective levels of colonization in soils to which they are not well adapted (Abbott et al, 1983).…”

Section: Amf Biodiversitymentioning

confidence: 99%

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Fungal inoculants in the field: Is the reward greater than the risk?

et al. 2017

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Abstract1. Biofertilizers are a large part of the global agricultural economy.2. Recently, there has been an increase in the number of companies producing fungal inoculants.3. Whether these inoculants are useful is not clear; they are difficult to monitor in the field. The unintended consequences of inoculants in natural systems is not known, but ifinvasive, they may pose a threat to soil and plant biodiversity and ecosystem functioning. K E Y W O R D Sarbuscular mycorrhizal fungi, biofertilizers, fungal inoculants, invasive fungi, sustainable agriculture

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Section: Tracking Specific Inoculantsmentioning

confidence: 99%

Section: Amf Biodiversitymentioning

confidence: 99%

Section: Amf Biodiversitymentioning

confidence: 99%

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Fungal inoculants in the field: Is the reward greater than the risk?

et al. 2017

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“…How introduced AMF species would alter existing AMF communities is still poorly understood as only few greenhouse studies have addressed this question. While some studies detected a decrease in diversity (Mummey et al, 2009; Koch et al, 2011) or functionality (Symanczik et al, 2015) of native AMF communities by introduced AMF inoculants, other studies observed no effect (Antunes et al, 2009). Without more precise knowledge about potential changes of native communities due to current application practices, there remains a risk of future unwanted consequences (Schwartz et al, 2006).…”

Section: Discussionmentioning

confidence: 98%

Application of Mycorrhiza and Soil from a Permaculture System Improved Phosphorus Acquisition in Naranjilla

et al. 2017

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Naranjilla (Solanum quitoense) is a perennial shrub plant mainly cultivated in Ecuador, Colombia, and Central America where it represents an important cash crop. Current cultivation practices not only cause deforestation and large-scale soil degradation but also make plants highly susceptible to pests and diseases. The use of arbuscular mycorrhizal fungi (AMF) can offer a possibility to overcome these problems. AMF can act beneficially in various ways, for example by improving plant nutrition and growth, water relations, soil structure and stability and protection against biotic and abiotic stresses. In this study, the impact of AMF inoculation on growth and nutrition parameters of naranjilla has been assessed. For inoculation three European reference AMF strains (Rhizoglomus irregulare, Claroideoglomus claroideum, and Cetraspora helvetica) and soils originating from three differently managed naranjilla plantations in Ecuador (conventional, organic, and permaculture) have been used. This allowed for a comparison of the performance of exotic AMF strains (reference strains) versus native consortia contained in the three soils used as inocula. To study fungal communities present in the three soils, trap cultures have been established using naranjilla as host plant. The community structures of AMF and other fungi inhabiting the roots of trap cultured naranjilla were assessed using next generation sequencing (NGS) methods. The growth response experiment has shown that two of the three reference AMF strains, a mixture of the three and soil from a permaculture site led to significantly better acquisition of phosphorus (up to 104%) compared to uninoculated controls. These results suggest that the use of AMF strains and local soils as inoculants represent a valid approach to improve nutrient uptake efficiency of naranjilla and consequently to reduce inputs of mineral fertilizers in the cultivation process. Improved phosphorus acquisition after inoculation with permaculture soil might have been caused by a higher abundance of AMF and the presence of Piriformospora indica as revealed by NGS. A higher frequency of AMF and enhanced root colonization rates in the trap cultures supplemented with permaculture soil highlight the importance of diverse agricultural systems for soil quality and crop production.

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“…Such concerns were also expressed in relation to AMF inoculations, but remain largely hypothetic due to our insufficient knowledge on AMF biogeography, population and community ecology [15]. Inoculation may substantially decrease the diversity of the root-colonizing AMF community by suppressing root colonization by native AMF [10, 16–19]. This suggests low resistance of native AMF communities against the biotic disturbance by introduction of new AMF genotypes.…”

Section: Introductionmentioning

confidence: 99%

Inoculation effects on root-colonizing arbuscular mycorrhizal fungal communities spread beyond directly inoculated plants

et al. 2017

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Inoculation with arbuscular mycorrhizal fungi (AMF) may improve plant performance at disturbed sites, but inoculation may also suppress root colonization by native AMF and decrease the diversity of the root-colonizing AMF community. This has been shown for the roots of directly inoculated plants, but little is known about the stability of inoculation effects, and to which degree the inoculant and the inoculation-induced changes in AMF community composition spread into newly emerging seedlings that were not in direct contact with the introduced propagules. We addressed this topic in a greenhouse experiment based on the soil and native AMF community of a post-mining site. Plants were cultivated in compartmented pots with substrate containing the native AMF community, where AMF extraradical mycelium radiating from directly inoculated plants was allowed to inoculate neighboring plants. The abundances of the inoculated isolate and of native AMF taxa were monitored in the roots of the directly inoculated plants and the neighboring plants by quantitative real-time PCR. As expected, inoculation suppressed root colonization of the directly inoculated plants by other AMF taxa of the native AMF community and also by native genotypes of the same species as used for inoculation. In the neighboring plants, high abundance of the inoculant and the suppression of native AMF were maintained. Thus, we demonstrate that inoculation effects on native AMF propagate into plants that were not in direct contact with the introduced inoculum, and are therefore likely to persist at the site of inoculation.

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Impact of water regimes on an experimental community of four desert arbuscular mycorrhizal fungal (AMF) species, as affected by the introduction of a non-native AMF species

Cited by 57 publications

References 65 publications

Fungal inoculants in the field: Is the reward greater than the risk?

Fungal inoculants in the field: Is the reward greater than the risk?

Application of Mycorrhiza and Soil from a Permaculture System Improved Phosphorus Acquisition in Naranjilla

Inoculation effects on root-colonizing arbuscular mycorrhizal fungal communities spread beyond directly inoculated plants

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