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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

Symanczik, Sarah; Courty, Pierre-Emmanuel; Boller, Thomas; Wiemken, Andreas and Al-Yahya'ei, Mohamed N. (2015) 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. Mycorrhiza, 25 (8), pp. 639-647.

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Summary

Field studies have revealed the impact of changing water regimes on the structure of arbuscular mycorrhizal fungal (AMF) communities, but it is not known what happens to the abundance of individual AMF species within the community when the water conditions in the rhizosphere change. The behavior of four AMF species isolated from the Arabian desert (Diversispora aurantia, Diversispora omaniana, Septoglomus africanum, and an undescribed Paraglomus species) was investigated when assembled in microcosms containing Sorghum bicolor as host plant, and treated with various water regimes. Furthermore, the impact of invasion of these assemblages by Rhizophagus irregularis, an AMF species widely used in commercial inocula, was studied. The abundance of each AMF species in sorghum roots was measured by determining the transcript numbers of their large ribosomal subunit (rLSU) by real-time PCR, using cDNA and species-specific primers. Plant biomass and length of AMF extraradical hyphae were also measured. The abundance of each AMF species within the sorghum roots was influenced by both the water regime and the introduction of R. irregularis. Under dry conditions, the introduction of R. irregularis reduced the total abundance of all native AMF species in roots and also led to a reduction in the amount of extraradical mycelium, as well as to a partial decrease in plant biomass. The results indicate that both water regime and the introduction of an invasive AMF species can strongly alter the structure of an AMF native assemblage with a consequent impact on the entire symbiotic mycorrhizal relationship.


EPrint Type:Journal paper
Keywords:Adaptation, Arbuscular mycorrhiza, Competition, Desert, Mycorrhizal community, Water regime, Department of Soil Scinences, Plant Symbiosis
Subjects: Soil
Crop husbandry > Crop health, quality, protection
Research affiliation:Other countries
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Soil Sciences
Switzerland > Other organizations
Deposited By: Forschungsinstitut für biologischen Landbau, FiBL
ID Code:33352
Deposited On:18 Jun 2018 12:48
Last Modified:18 Jun 2018 12:48
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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