Do concentrations of glucose and fungal inoculum influence the competitiveness of two early-stage ectomycorrhizal fungi in Afzelia africana seedlings?

Diedhiou, A.G.; Verpillot, F.; Gueye, Ousmane; Dreyfus, B; Duponnois, Robin; Bâ, Amadou

doi:10.1016/j.foreco.2004.07.048

Cited by 8 publications

(2 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because the theory links the relative consumption of an element to its relative demand for growth, we predict that the stoichiometric constraints on the elemental compositions of the organic resource and decomposers should help fulfill these two conditions and make coexistence on the two resources possible, given adequate resource supplies. Resource competition between different decomposer strains or species has rarely been addressed experimentally (e.g., Vadstein 1998;Basson 2000;Celar 2003;Diedhiou et al 2004) and certainly never by using organic resources that combine two limiting elements or by looking for differences in elemental composition between competitors. Therefore, it is premature to draw conclusions on the validity of this result.…”

Section: Discussionmentioning

confidence: 99%

Stoichiometric Constraints on Resource Use, Competitive Interactions, and Elemental Cycling in Microbial Decomposers

Cherif¹,

Loreau²

2007

The American Naturalist

View full text Add to dashboard Cite

Heterotrophic microbial decomposers, such as bacteria and fungi, immobilize or mineralize inorganic elements, depending on their elemental composition and that of their organic resource. This fact has major implications for their interactions with other consumers of inorganic elements. We combine the stoichiometric and resource-ratio approaches in a model describing the use by decomposers of an organic and an inorganic resource containing the same essential element, to study its consequences on decomposer interactions and their role in elemental cycling. Our model considers the elemental composition of organic matter and the principle of its homeostasis explicitly. New predictions emerge, in particular, (1) stoichiometric constraints generate a trade-off between the R* values of decomposers for the two resources; (2) they create favorable conditions for the coexistence of decomposers limited by different resources and with different elemental demands; (3) however, combined with conditions on species-specific equilibrium limitation, they draw decomposers toward colimitation by the organic and inorganic resources on an evolutionary time scale. Moreover, we derive the conditions under which decomposers switch from consumption to excretion of the inorganic resource. We expect our predictions to be useful in explaining the community structure of decomposers and their interactions with other consumers of inorganic resources, particularly primary producers.

show abstract

Section: Discussionmentioning

confidence: 99%

Stoichiometric Constraints on Resource Use, Competitive Interactions, and Elemental Cycling in Microbial Decomposers

Cherif¹,

Loreau²

2007

The American Naturalist

View full text Add to dashboard Cite

show abstract

“…White Scleroderma fungal strains were also observed on roots of some Gnetum spp lianas in secondary forests and fallows of Chromoleana odorata in South Cameroon (Onguene, 2000;Bechem and Alexander, 2012). However, only few studies have been carried out on African ectomycorrhizae (Diedhiou et al, 2004).…”

Section: Distinctive Ectomycorrhizal Morphological Charactersmentioning

confidence: 99%

Diversity of Endemic Ectomycorrhizae of Humid Forests of South Cameroon

Nérée¹,

Bechem

Ambroise

et al. 2022

J. Environ. Sci. Eng. Technol.

View full text Add to dashboard Cite

The ecologically important below-ground ectomycorrhizal (ECM) biodiversity of tropical humid forests remain poorly known. Most ECM inventories have been based upon description and identification of fruitbodies with few work on ECM root tips of tropical tree species. Morpho-anatomical descriptions of root tips of 24 ECM Fabaceae/Detarioideae, Uapaca tree species, and Gnetum lianas were conducted in humid forest of South Cameroon. ECM forest clumps were the only resort sites for the more than 30 endemic ECM morphotypes, with apparently no host specificity. Distinguished by four colors – white, yellow, brown, and dark brown – and five textures – smooth, cottony, woolly, spiny and verrucose –, they differed from to the golden yellow coralloïdal Gnetum liana ECM with plectenchymatous mantle. Tree ECM were of monopodial-pinnate or -pyramidal types with external felt prosenchyma mantles shielded with abundant rhizomorphs, emanating hyphae and variously shaped cystida with clamp connections. These ECM fungal attributes may confer ECM associations with strong competitive abilities to strive at best on prevailing nutrient-poor acid soils and harsh conditions, thus better explaining tropical monodominance. Yet, much research is still needed to determine the role of below-ground ECM biodiversity on structure and functioning of tropical humid forests of the Congo basin.

show abstract

Contrasting responses to ectomycorrhizal inoculation in seedlings of six tropical African tree species

Diédhiou

Gueye²,

Diabaté

et al. 2005

Mycorrhiza

View full text Add to dashboard Cite

Five caesalpinioid legumes, Afzelia africana, Afzelia bella, Anthonotha macrophylla, Cryptosepalum tetraphylum and Paramacrolobium coeruleum, and one Euphorbiaceae species, Uapaca somon, with a considerable range in seed sizes, exhibited different responses to inoculation by four species of ectomycorrhizal (ECM) fungi, Scleroderma dictyosporum, S. verrucosum, Pisolithus sp. and one thelephoroid sp. in greenhouse conditions. Thelephoroid sp. efficiently colonized seedlings of all of the five caesalpinioid legumes except U. somon, but provided no more growth benefit than the other fungi. Thelephoroid sp. and S. dictyosporum colonized seedlings of U. somon poorly, but stimulated plant growth more than the other fungi. The relative mycorrhizal dependency (RMD) values of the caesalpinioid legumes were never higher than 50%, whilst U. somon had RMD values ranging from 84.6 to 88.6%, irrespective of the fungal species. The RMD values were negatively related to seed mass for all plant species. Potassium concentrations in leaves were more closely related than phosphorus to the stimulation of seedling biomass production by the ECM fungi. Our data support the hypothesis that African caesalpinioid legumes and euphorbe tree species with smaller seeds show higher RMD values than those with the larger seeds.

show abstract

Do concentrations of glucose and fungal inoculum influence the competitiveness of two early-stage ectomycorrhizal fungi in Afzelia africana seedlings?

Cited by 8 publications

References 19 publications

Stoichiometric Constraints on Resource Use, Competitive Interactions, and Elemental Cycling in Microbial Decomposers

Stoichiometric Constraints on Resource Use, Competitive Interactions, and Elemental Cycling in Microbial Decomposers

Diversity of Endemic Ectomycorrhizae of Humid Forests of South Cameroon

Contrasting responses to ectomycorrhizal inoculation in seedlings of six tropical African tree species

Contact Info

Product

Resources

About