Angiosperm Gymnostoma Trees Produce Root Nodules Colonized by Arbuscular Mycorrhizal Fungi Related to Glomus

Structure and fungal composition is presented here for 'mycorrhizal' nodules of two angiosperms of the genus Gymnostoma (Casuarinaceae), G. deplancheanum and G. nodiflorum. These species are endemic to New Caledonia, where they grow on ultramafic soils. The mycorrhizal nodules, which are m...

Full description

Saved in:
Bibliographic Details
Published in:The New phytologist 2001-01, Vol.149 (1), p.115-125
Main Authors: Duhoux, E., Rinaudo, G., Diem, H. G., Auguy, F., Fernandez, D., Bogusz, D., Franche, C., Dommergues, Y., Huguenin, B.
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
arbuscular mycorrhiza
arbuscular mycorrhizas
Biological and medical sciences
Casuarinaceae
Economic plant physiology
Fundamental and applied biological sciences. Psychology
Fungi
Glomus
Gymnostoma
Gymnostoma deplancheanum
Gymnostoma nodiflorum
Hyphae
Infections
morphogenesis
Mycorrhizal fungi
mycorrhizal nodule
Nodules
Parasitism and symbiosis
Plant physiology and development
Plant roots
Plants
Polymerase chain reaction
Root nodules
Symbiosis
Symbiosis (nodules, symbiotic nitrogen fixation, mycorrhiza...)
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Structure and fungal composition is presented here for 'mycorrhizal' nodules of two angiosperms of the genus Gymnostoma (Casuarinaceae), G. deplancheanum and G. nodiflorum. These species are endemic to New Caledonia, where they grow on ultramafic soils. The mycorrhizal nodules, which are modified lateral roots invaded by an arbuscular mycorrhizal fungus, occur in addition to N2-fixing nodules. Techniques included PCR amplification of extracted DNA, for species identification, and histological studies to compare the developmental pathway of Gymnostoma mycorrhizal nodules with that of actinorhizal nodules. The fungal DNA suggested that the strain belongs to the genus Glomus (Glomales). The endophytic mycelium also contained typical Glomus arbuscules and hyphal coils. Structurally, Gymnostoma mycorrhizal nodules are similar to those described in some Coniferales and in Caesalpinioideae trees of French Guyana. The mycorrhizal nodules of G. deplancheanum and G. nodiflorum contain a fungus belonging to the Glomales. The role of the nodules might be linked to the ecological situation of the host plants, which are pioneers in exposed and rocky habitats.
ISSN:0028-646X
1469-8137
DOI:10.1046/j.1469-8137.2001.00005.x