Order of plant host establishment alters the composition of arbuscular mycorrhizal communities

Hausmann, Natasha; Hawkes, Christine V.

doi:10.1890/09-0924.1

Cited by 76 publications

(61 citation statements)

References 52 publications

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“…Because the trap culture source material comprised soil from underneath host plants, it is possible that the AMF community in each sample was not only influenced by the target host, but by neighboring vegetation and the legacy effects of prior inhabitants of that microsite as well (Hausmann and Hawkes 2009;Hausmann and Hawkes 2010). Trap cultures also introduce cultivation bias due to the varying growth strategies of the different AMF species and vastly different field and culture environmental conditions (Sýkorová et al 2007).…”

Section: Discussionmentioning

confidence: 99%

Arbuscular mycorrhizal fungal community differs between a coexisting native shrub and introduced annual grass

et al. 2012

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Arbuscular mycorrhizal fungi (AMF) have been implicated in non-native plant invasion success and persistence. However, few studies have identified the AMF species associating directly with plant invaders, or how these associations differ from those of native plant species. Identifying changes to the AMF community due to plant invasion could yield key plant-AMF interactions necessary for the restoration of native plant communities. This research compared AMF associating with coexisting Bromus tectorum, an invasive annual grass, and Artemisia tridentata, the dominant native shrub in western North America. At three sites, soil and root samples from Bromus and Artemisia were collected. Sporulation was induced using trap cultures, and spores were identified using morphological characteristics. DNA was extracted from root and soil subsamples and amplified. Sequences obtained were aligned and analyzed to compare diversity, composition, and phylogenetic distance between hosts and sites. Richness of AMF species associated with Artemisia in cultures was higher than AMF species associated with Bromus. Gamma diversity was similar and beta diversity was higher in AMF associated with Bromus compared to Artemisia. AMF community composition differed between hosts in both cultures and roots. Two AMF species (Archaeospora trappei and Viscospora viscosum) associated more frequently with Artemisia than Bromus across multiple sites. AMF communities in Bromus roots were more phylogenetically dispersed than in Artemisia roots, indicating a greater competition for resources within the invasive grass. Bromus associated with an AMF community that differed from Artemisia in a number of ways, and these changes could restrict native plant establishment.

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Section: Discussionmentioning

confidence: 99%

Arbuscular mycorrhizal fungal community differs between a coexisting native shrub and introduced annual grass

et al. 2012

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“…Within such a framework, it was impossible to implement many of the dynamic features of plant/network interactions (Smith and Read 2008;Hausmann and Hawkes 2009). As such, this implementation acted to demonstrate the significance of the spatial distribution of networks among plants/resources on the cost/benefit relationship between plants and networks, and to inform future experiments and their research.…”

Section: Discussionmentioning

confidence: 99%

“…The limitations also highlight the need for moving into a more temporally explicit model. Such a model would also allow the order of patch encounter (Duke and Caldwell 2000), temporal network dynamics (Hausmann and Hawkes 2009), and the physical size and temporal properties of patches (Fitter 1994;Hodge 2004) to be integrated.…”

Section: Discussionmentioning

confidence: 99%

Optimal root proliferation strategies: the roles of nutrient heterogeneity, competition and mycorrhizal networks

2011

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Background and Aims Plants proliferate roots in order to acquire nutrients, typically contending with heterogeneous resources and competing neighbours. A mathematical model was developed to identify optimal root proliferation strategies in patchy nutrient environments. The impact of joining mycorrhizal networks was also assessed. Methods A simple model of growth and competition in one spatial dimension was implemented within a genetic algorithm to obtain optimal proliferation strategies under different scenarios of Responsible Editor: Hans Lambers. Electronic supplementary materialThe online version of this article (resource distribution, and in the presence or absence of local competition and large-scale mycorrhizal networks. Results A strong proliferation response emerged for isolated plants in heterogeneous environments with low resources, and also for plants growing in competition. Even in statistically homogeneous environments, the presence of competition conferred a selective advantage to plants proliferating in the direction of the most recently acquired patch. In the presence of mycorrhizal networks, the optimal strategy switched from symbiosis to proliferation driven growth as the relative cost of acquiring resources through the networks increased. Conclusions The optimal proliferation response in a given scenario was governed by a hierarchy of factors: resource levels and distribution; the presence or absence of competition; and the marginal benefit of obtaining resources via symbiotic relationships with mycorrhizas.

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“…As a consequence, the number of ecological studies concerning AMF has increased considerably in recent years (1)(2)(3)(4)(5)(6)(7)(8)(9). Those studies considered AMF communities associated with different host plants in many different ecosystems.…”

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confidence: 99%

Soil Characteristics Driving Arbuscular Mycorrhizal Fungal Communities in Semiarid Mediterranean Soils

Alguacil

Torres

Montesinos‐Navarro

et al. 2016

Appl Environ Microbiol

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We investigated communities of arbuscular mycorrhizal fungi (AMF) in the roots and the rhizosphere soil of Brachypodium retusum in six different natural soils under field conditions. We explored phylogenetic patterns of AMF composition using indicator species analyses to find AMF associated with a given habitat (root versus rhizosphere) or soil type. We tested whether the AMF characteristics of different habitats or contrasting soils were more closely related than expected by chance. Then we used principal-component analysis and multivariate analysis of variance to test for the relative contribution of each factor in explaining the variation in fungal community composition. Finally, we used redundancy analysis to identify the soil properties that significantly explained the differences in AMF communities across soil types. The results pointed out a tendency of AMF communities in roots to be closely related and different from those in the rhizosphere soil. The indicator species analyses revealed AMF associated with rhizosphere soil and the root habitat. Soil type also determined the distribution of AMF communities in soils, and this effect could not be attributed to a single soil characteristic, as at least three soil properties related to microbial activity, i.e., pH and levels of two micronutrients (Mn and Zn), played significant roles in triggering AMF populations. IMPORTANCECommunities of arbuscular mycorrhizal fungi (AMF) are main components of soil biota that can determine the productivity of ecosystems. These fungal assemblages vary across host plants and ecosystems, but the main ecological processes that shape the structures of these communities are still largely unknown. A field study in six different soil types from semiarid areas revealed that AMF communities are significantly influenced by habitat (soil versus roots) and soil type. In addition, three soil properties related to microbiological activity (i.e., pH and manganese and zinc levels) were the main factors triggering the distribution of AMF. These results contribute to a better understanding of the ecological factors that can shape AMF communities, an important soil microbial group that affects multiple ecosystem functions.A rbuscular mycorrhizal fungi (AMF) represent an important soil microbial group that affects multiple ecosystem functions and processes, including nutrient cycling, plant productivity and competition, and plant diversity. As a consequence, the number of ecological studies concerning AMF has increased considerably in recent years (1-9). Those studies considered AMF communities associated with different host plants in many different ecosystems. However, studies comparing the occurrence of specific AMF species and communities in different soil types are scarce and have focused mainly on cultivated soils and different land uses (10-13). Differences in soil types have been reported to be key factors determining AMF community composition (10), and this is particularly relevant in stressed environments such as serpentine soi...

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Order of plant host establishment alters the composition of arbuscular mycorrhizal communities

Cited by 76 publications

References 52 publications

Arbuscular mycorrhizal fungal community differs between a coexisting native shrub and introduced annual grass

Arbuscular mycorrhizal fungal community differs between a coexisting native shrub and introduced annual grass

Optimal root proliferation strategies: the roles of nutrient heterogeneity, competition and mycorrhizal networks

Soil Characteristics Driving Arbuscular Mycorrhizal Fungal Communities in Semiarid Mediterranean Soils

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