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Plant and Cell Physiology, 2003, Vol. 44, No. 11 1208-1214
© 2003 Oxford University Press

A Member of the Germin-Like Protein Family is a Highly Conserved Mycorrhiza-Specific Induced Gene

Jasmin Doll1, Bettina Hause2, Kirill Demchenko3,4, Katharina Pawlowski3 and Franziska Krajinski1,5

1 Lehrgebiet Molekulargenetik, Universität Hannover, Herrenhäuser Str. 2, D-30419 Hannover, Germany
2 Institute of Plant Biochemistry, Department of Secondary Metabolism, P.O. Box 110432, D-06018 Halle, Germany
3 Universität Göttingen, Justus-von-Liebig-Weg 11, D-37077 Göttingen, Germany

A Medicago truncatula cDNA encoding a germin-like protein (GLP) was isolated from a suppression subtractive hybridization cDNA library enriched for arbuscular mycorrhiza (AM)-induced genes. The MtGLP1 amino acid sequence shows some striking differences to previously described plant GLP sequences and might therefore represent a new subgroup of this multigene family. The MtGlp1 mRNA was strongly induced in roots and root cultures colonized by the AM fungus Glomus intraradices. Whereas MtGlp1 is strongly induced in AM, no transcripts of the gene were detected in non-infected roots or in roots after infection with the oomycete root pathogen Aphanomyces euteiches or with Rhizobia. Increased phosphate levels during fertilization also could not stimulate MtGlp1 transcription. Hence, MtGlp1 induction seems to be an AM-specific phenomenon. In situ hybridization showed that MtGlp1 is localized in arbuscule containing cells. A putative orthologue of this AM-specific GLP gene could be localized in a second legume Lotus japonicus, indicating that the regulation of a member of the GLP family belongs to a conserved mechanism in AM regulation in different plant species.

4 Present address: Komarov Botanical Institute RAS, Prof. Popov St. 2, 197376 St.-Petersburg, Russia.

5 Corresponding author: Email, krajinski{at}lgm.uni-hannover.de; Fax, +49-511-7624088.


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