In planta production of indole-3-acetic acid by Colletotrichum gloeosporioides f. sp. aeschynomene.
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.
Department of Plant Sciences, Tel Aviv University, Ramat-Aviv, Tel Aviv 69978, Israel.
Rudy
R
Maor
Sefi
S
Haskin
Hagit
H
Levi-Kedmi
Amir
A
Sharon
D020231:Colletotrichum / Q000254:growth & development / Q000378:metabolism* / Q000472:pathogenicity; D007887:Fabaceae / Q000382:microbiology*; D007210:Indoleacetic Acids / Q000378:metabolism*; D010935:Plant Diseases / Q000382:microbiology; D010937:Plant Growth Regulators / Q000096:biosynthesis; D014364:Tryptophan / Q000378:metabolism
D007210:Indoleacetic Acids; D010937:Plant Growth Regulators; C030737:indoleacetic acid; C015950:indoleacetamide; D014364:Tryptophan