Arbuscular mycorrhizas and ectomycorrhizas of Uapaca bojeri L. (Euphorbiaceae): sporophore diversity, patterns of root colonization, and effects on seedling growth and soil microbial catabolic diversity

Abstract

The main objectives of this study were (1) to describe the diversity of mycorrhizal fungal communities associated with Uapaca bojeri, an endemic Euphorbiaceae of Madagascar, and (2) to determine the potential benefits of inoculation with mycorrhizal fungi [ectomycorrhizal and/or arbuscular mycorrhizal (AM) fungi] on the growth of this tree species and on the functional diversity of soil microflora. Ninety-four sporophores were collected from three survey sites. They were identified as belonging to the ectomycorrhizal genera Afroboletus, Amanita, Boletus, Cantharellus, Lactarius, Leccinum, Rubinoboletus, Scleroderma, Tricholoma, and Xerocomus. Russula was the most frequent ectomycorrhizal genus recorded under U. bojeri. AM structures (vesicles and hyphae) were detected from the roots in all surveyed sites. In addition, this study showed that this tree species is highly dependent on both types of mycorrhiza, and controlled ectomycorrhization of this Uapaca species strongly influences soil microbial catabolic diversity. These results showed that the complex symbiotic status of U. bojeri could be managed to optimize its development in degraded areas. The use of selected mycorrhizal fungi such the Scleroderma Sc1 isolate in nursery conditions could be of great interest as (1) this fungal strain is very competitive against native symbiotic microflora, and (2) the fungal inoculation improves the catabolic potentialities of the soil microflora.

Mycorrhizal status of native trees and shrubs from eastern Madagascar littoral forests with special emphasis on one new ectomycorrhizal endemic family, the Asteropeiaceae

“…Typical ECM fungi were reported more than 60 yr ago (Heim, 1938), but no links with particular host genera were suggested. Ongoing mycological inventories underline the exceptional diversity of the associated ECM fungi (Buyck et al ., 2007; Ramanankierana et al ., 2007). Ducousso et al .…”

ITS-based assessment of Madagascar’s fungal diversity and arrival of ectomycorrhizal fungi to the island

“…In our study we identified mainly fungi belonging to Basidiomycota, with the most abundant families being Russulaceae, Thelephoraceae, Boletaceae, Cortinariaceae and Amanitaceae, which are regularly found to be the most abundant ectomycorrhizal clades in tropical forests (Ramanankierana et al . 2007; Henkel et al .…”

“…We generated three family-level datasets with the OTUs obtained in our clustering analyses belonging to the EcM families Amanitaceae, Boletaceae and Russulaceae, as they are among the most abundant EcM families found in tropical forests (Ramanankierana et al . 2007; Henkel et al .…”

Effect of Indole Acetic Acid on the Synergistic Interactions ofBradyrhizobiumandGlomus fasciculatumon Growth, Nodulation, and Nitrogen Fixation ofDalbergia sissooRoxb

“…The tripartite synergistic interaction of DS-Rhz-9 and G. fasciculatum with D. sissoo seems to be promising and can be utilized in improving seedling growth in forest nurseries and reforestation of degraded areas. The mycorrhizal communities associated with Uapaca bojeri and the potential benefits of inoculation with mycorrhizal fungi in terms of plant growth and functional diversity of soil microflora was studied by Ramanankierana et al (2007) and suggested that the complex symbiotic status of the plant could be managed to optimize its development in degraded areas. The ability of leguminous trees to develop symbiotic association with Bradyrhizobium and mycorrhiza makes them ideal for reforestation, and this twin symbiotic association offers a better chance for these plants to survive adverse conditions.…”