title: Auxins as signals in arbuscular mycorrhiza formation.
abstract: Plant hormones such as auxin derivatives are likely signals during the establishment of an arbuscular mycorrhizal (AM) symbiosis. Although reports on auxin levels during AM in different plant species are contradictory, the contribution of auxins to the establishment of an AM symbiosis might be an important factor especially for the development of lateral roots which are the preferred infection sites for the fungi. In addition to evidence that different auxins could be elevated after colonization with AM fungi, there are also overlapping gene expression patterns between auxin-treated and AM-inoculated roots that provide further clues on auxin-triggered colonization events. Using an auxin-inducible promoter-reporter system it was shown that the reporter was strongly induced in AM colonized roots, although co-localization with AM fungi was not observed. Our data are discussed in frame of a model together with other plant hormones which might be involved in the AM colonization processes.
authors.affiliation: Institut für Botanik; Technische Universität Dresden; Dresden, Germany.
authors.forename: Jutta
authors.initials: J
authors.lastname: Ludwig-Müller
authors.forename: Mike
authors.initials: M
authors.lastname: Güther
references.citation: Physiol Plant. 2002 Jun;115(2):320-329
references.pmid: 12060252
references.citation: New Phytol. 2002 May;154(2):501-507
references.pmid: 33873426
references.citation: Mol Plant Microbe Interact. 1997 Jan;10(1):124-31
references.pmid: 9002275
references.citation: Plant Biol (Stuttg). 2006 May;8(3):346-52
references.pmid: 16807827
references.citation: Plant Physiol. 2002 Nov;130(3):1213-20
references.pmid: 12427988
references.citation: Mol Plant Microbe Interact. 1997 Mar;10(2):215-20
references.pmid: 9057327
references.citation: J Plant Growth Regul. 2000 Jun;19(2):144-154
references.pmid: 11038224
references.citation: Plant Cell. 1996 Oct;8(10):1871-1883
references.pmid: 12239368
references.citation: J Plant Physiol. 2005 Nov;162(11):1210-9
references.pmid: 16323272
references.citation: Planta. 2005 May;221(2):184-96
references.pmid: 15871030
references.citation: New Phytol. 2000 May;146(2):343-352
references.pmid: 33862976
references.citation: Planta. 2005 Nov;222(4):709-15
references.pmid: 16025340