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Applied and Environmental Microbiology, March 2004, p. 1852-1854, Vol. 70, No. 3
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.3.1852-1854.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

In Planta Production of Indole-3-Acetic Acid by Colletotrichum gloeosporioides f. sp. aeschynomene

Rudy Maor, Sefi Haskin, Hagit Levi-Kedmi, and Amir Sharon*

Department of Plant Sciences, Tel Aviv University, Ramat-Aviv, Tel Aviv 69978, Israel

Received 25 June 2003/ Accepted 3 December 2003

The plant pathogenic fungus Colletotrichum gloeosporioides f. sp. aeschynomene utilizes external tryptophan to produce indole-3-acetic acid (IAA) through the intermediate indole-3-acetamide (IAM). We studied the effects of tryptophan, IAA, and IAM on IAA biosynthesis in fungal axenic cultures and on in planta IAA production by the fungus. IAA biosynthesis was strictly dependent on external tryptophan and was enhanced by tryptophan and IAM. The fungus produced IAM and IAA in planta during the biotrophic and necrotrophic phases of infection. The amounts of IAA produced per fungal biomass were highest during the biotrophic phase. IAA production by this plant pathogen might be important during early stages of plant colonization.

* Corresponding author. Mailing address: Department of Plant Sciences, Tel Aviv University, Tel Aviv 69978, Israel. Phone: 972 3 640 6741. Fax: 972 3 6405498. E-mail: amirsh{at}tauex.tau.ac.il.

Applied and Environmental Microbiology, March 2004, p. 1852-1854, Vol. 70, No. 3
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.3.1852-1854.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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