Record ID No. |
1677 |
Author(s) |
Croll, D., Wille, L., Gamper, H A., Mathimaran, N., Lammers, P J., Corradi, N., Sanders, I R , 2008 |
Affiliation |
University of Lausanne, Department of Ecology & Evolution, Biophore Building, CH-1015 Lausanne, SWITZERLAND |
Title |
Genetic diversity and host plant preferences revealed by simple sequence repeat and mitochondrial markers in a population of the arbuscular mycorrhizal fungus Glomus intraradices |
Source. Vol.(no):Page |
New Phytologist.178(3):672-687p |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Biochemistry |
Sub-subjects |
Miscellaneous |
Organism |
n.a. |
Country |
SWITZERLAND, Europe |
Abstracts |
Arbuscular mycorrhizal fungi (AMF) are important symbionts of plants that improve
plant nutrient acquisition and promote plant diversity. Although within-species genetic
differences among AMF have been shown to differentially affect plant growth, very little is
actually known about the degree of genetic diversity in AMF populations. This is largely because
of difficulties in isolation and cultivation of the fungi in a clean system allowing reliable
genotyping to be performed. A population of the arbuscular mycorrhizal fungus Glomus intraradices
growing in an in vitro cultivation system was studied using newly developed simple sequence
repeat (SSR), nuclear gene intron and mitochondrial ribosomal gene intron markers. The markers
revealed a strong differentiation at the nuclear and mitochondrial level among isolates.
Genotypes were nonrandomly distributed among four plots showing genetic subdivisions in the
field. Meanwhile, identical genotypes were found in geographically distant locations. AMF
genotypes showed significant preferences to different host plant species (Glycine max, Helianthus
annuus and Allium porrum) used before the fungal in vitro culture establishment. Host plants in a
field could provide a heterogeneous environment favouring certain genotypes. Such preferences may
partly explain within-population patterns of genetic diversity. |