Soil moisture—a regulator of arbuscular mycorrhizal fungal community assembly and symbiotic phosphorus uptake

Sharma, Deepika; Kothamasi, David

doi:10.1007/s00572-014-0596-1

Cited by 125 publications

(85 citation statements)

References 56 publications

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“…In 2014, a significant decrease in the intensity of mycorrhizal colonization was observed (Figure 18) due to high humidity of the soil, which reduces the root colonization by the AMF as a result of high rainfall (740 mm) compared to the other years ( Figure 1). These results are in agreement with the results found by Bagayoko (2000b) and Deepika and Kothamasi (2015). On the other hand, since the soil is very poor in mineral elements and mostly soluble P, the mycorrhization becomes obviously the only way to ensure phosphate nutrition from the stocks of nonsoluble phosphorus, which is well known to maximize colonization and sporulation (Daniels and Trappe, 1986) and that any abundance of phosphorus in the soil solution around the plant roots could reduce the intensity of the mycorrhizal activity.…”

Section: Intensity Of Mycorrhizal Colonization (M%)supporting

confidence: 82%

Impact of previous legumes on millet mycorrhization and yields in sandy soil of West African Sahel

Sangaré¹,

Doka²,

M³

et al. 2017

J. Soil Sci. Environ. Manage.

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A preliminary study was conducted during the raining seasons 2012 through 2015 to assess the status of arbuscular mycorrhiza fungi associated with 4 legumes and millet on the sandy soil of Sadoré, Niger. A factorial completely randomized block design was used for the layout. Crop roots parameters of mycorrhization and soil fungi spore density and biodiversity were investigated as responses to varied planting densities, rates of rock phosphate, and of urea application on millet monoculture. Spores of Glomus were present in 100% of plots with respectively 96%, 47%, 77%, and 13% as relative frequency during rainy seasons 2012, 2013, 2014, and 2015; but spores of Gigaspora were present in 70% of plots and with 3.63%, 4%, 1.38%, and 1% as relative frequency the same years. Spore density/100g of root zone soil varied with crop species and rate of applied crop residue. The maximum intensity of mycorrhization was 78% while the arbuscular had a rate of 48% as maximum. The parameters of mycorrhization were influenced by the crop species but not by the rates of applied rock phosphate and the rate of returned crop residues as well. Millet yield in monoculture was affected by residual effects of previous basis legume crop.

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Section: Intensity Of Mycorrhizal Colonization (M%)supporting

confidence: 82%

Impact of previous legumes on millet mycorrhization and yields in sandy soil of West African Sahel

Sangaré¹,

Doka²,

M³

et al. 2017

J. Soil Sci. Environ. Manage.

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“…In particular, our results showed distinctive communities when grassland plots were exposed to increased rainfall, compared to those experiencing drought treatments. Other studies have observed changes in the composition and richness of AM fungal communities from semi‐arid environments due to an increase in rainfall amount (Deepika & Kothamasi, ; Li et al., ). In contrast, rainfall reduction, change in frequency or summer drought did not form as distinctly divergent communities from the ambient treatment, possibly because these fungi exhibit adaptation to the high intra‐ and interannual rainfall variability that is characteristic of our site (Power et al., ).…”

Section: Discussionmentioning

confidence: 96%

Experimentally altered rainfall regimes and host root traits affect grassland arbuscular mycorrhizal fungal communities

et al. 2018

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Future climate scenarios predict changes in rainfall regimes. These changes are expected to affect plants via effects on the expression of root traits associated with water and nutrient uptake. Associated microorganisms may also respond to these new precipitation regimes, either directly in response to changes in the soil environment or indirectly in response to altered root trait expression. We characterized arbuscular mycorrhizal (AM) fungal communities in an Australian grassland exposed to experimentally altered rainfall regimes. We used Illumina sequencing to assess the responses of AM fungal communities associated with four plant species sampled in different watering treatments and evaluated the extent to which shifts were associated with changes in root traits. We observed that altered rainfall regimes affected the composition but not the richness of the AM fungal communities, and we found distinctive communities in the increased rainfall treatment. We found no evidence of altered rainfall regime effects via changes in host physiology because none of the studied traits were affected by changes in rainfall. However, specific root length was observed to correlate with AM fungal richness, while concentrations of phosphorus and calcium in root tissue and the proportion of root length allocated to fine roots were correlated to community composition. Our study provides evidence that climate change and its effects on rainfall may influence AM fungal community assembly, as do plant traits related to plant nutrition and water uptake. We did not find evidence that host responses to altered rainfall drive AM fungal community assembly in this grassland ecosystem.

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“…There is evidence of several biotic factors with strong influences in regulating AMF community composition, with the best studied being the host plant (29,30,(72)(73)(74) and host functional traits (6,37). Among the abiotic factors that can have relevant roles in driving AMF communities are soil moisture (75), rainfall patterns, and geographical distance (40,76). There is no doubt that soil type has a role in the AMF distribution (10,34,35,40,(77)(78)(79)(80), and our work also demonstrated that soil type is a major factor driving AMF assemblages, after elimination of the host factor and other environmental variables not related to soil characteristics.…”

Section: Discussionmentioning

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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Soil moisture—a regulator of arbuscular mycorrhizal fungal community assembly and symbiotic phosphorus uptake

Cited by 125 publications

References 56 publications

Impact of previous legumes on millet mycorrhization and yields in sandy soil of West African Sahel

Impact of previous legumes on millet mycorrhization and yields in sandy soil of West African Sahel

Experimentally altered rainfall regimes and host root traits affect grassland arbuscular mycorrhizal fungal communities

Soil Characteristics Driving Arbuscular Mycorrhizal Fungal Communities in Semiarid Mediterranean Soils

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