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Appl. Environ. Microbiol., May 1997, 1756-1761, Vol 63, No. 5
Copyright © 1997, American Society for Microbiology

Restriction Analysis of PCR-Amplified Internal Transcribed Spacers of Ribosomal DNA as a Tool for Species Identification in Different Genera of the Order Glomales

D Redecker, H Thierfelder, C Walker and D Werner
Fachbereich Biologie der Universitat Marburg, D-35032 Marburg, Germany, and Forestry Commission, Northern Research Station, Roslin, Midlothian, United Kingdom

A technique combining PCR and restriction fragment length polymorphism analysis was used to generate specific DNA fragment patterns from spore extracts of arbuscular mycorrhizal fungi. With the universal primers ITS1 and ITS4, DNA fragments were amplified from species of Scutellospora and Gigaspora that were approximately 500 bp long. The apparent lengths of the corresponding fragments from Glomus spp. varied between 580 and 600 bp. Within the genus Glomus, the restriction enzymes MboI, HinfI, and TaqI were useful for distinguishing species. Depending on the restriction enzyme used, groups of species with common fragment patterns could be found. Five tropical and subtropical isolates identified as Glomus manihotis and G. clarum could not be distinguished by their restriction patterns, corresponding to the morphological similarity of the spores. The variation of internal transcribed spacer sequences among the Gigaspora species under study was low. Fragment patterns of Scutellospora spp. showed their phylogenetic relationship with Gigaspora and revealed only a slightly higher degree of variation.

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