Interaction of abscisic acid and indole-3-acetic acid-producing fungi with Salix leaves |
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Authors: | Tapani Tuomi Jouni Ilvesoksa Simo Laakso Heikki Rosenqvist |
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Affiliation: | (1) Faculty of Process Engineering and Materials Science, Department of Chemical Engineering, Laboratory of Biochemistry and Microbiology, Helsinki University of Technology, SF-02150 Espoo, Finland |
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Abstract: | The molds Botrytis cinerea, Cladosporium cladosporioides, and the yeast Aureobasidium pullulans, isolated from the leaves of three short-rotation Salix clones, were found to produce indole-3-acetic acid (IAA). Abscisic acid (ABA) production was detected in B. cinerea. The contents of IAA and ABA in the leaves of the Salix clones and the amounts of fungal propagules in these leaves were also measured, in order to evaluate whether the amounts of plant growth regulators produced by the fungi would make a significant contribution to the hormonal quantities of the leaves. The content of ABA, and to a lesser degree that of IAA, showed a positive correlation with the frequency of infection by the hormone-producing organisms. The amounts of hormone-producing fungi on leaves that bore visible colonies were, however, not sufficiently high to support the claim that either the fungal production of ABA or IAA would significantly contribute to the hormonal contents of the leaves of the Salix clones. It is therefore suggested that the effect of fungal IAA production on plants is limited to the rhizosphere and that B. cinerea, which is a known pathogen, induces ABA production by the mother plant as a response to physiological stress.Abbreviations ABA
abscisic acid
- ABA-Me
abscisic acid methyl ester
- GC-MS-SIM
gas chromatography-selected ion monitoring-mass spectrometry
- IAA
indole-3-acetic acid
- IAA-Me
indole-3-acetic acid methyl ester
Author for correspondence. |
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