Effect of indole-acetic acid (IAA) on the development of symptoms caused by <Emphasis Type="Italic">Pythium ultimum</Emphasis> on tomato plants |
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| Authors: | Valérie Gravel Hani Antoun Russell J Tweddell |
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| Institution: | (1) Centre de recherche en horticulture, Université Laval, Quebec, QC, Canada, G1K 7P4 |
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| Abstract: | The effect of indole-acetic acid (IAA) on the development of symptoms caused by Pythium ultimum on tomato plants was investigated using different bioassays. Application of IAA (5 μg ml−1) on tomato seedlings inoculated with P. ultimum did not affect their emergence suggesting that IAA did not affect the severity of Pythium damping-off. However, IAA was shown
to influence the development of P. ultimum symptoms on tomato plantlets. Low concentrations of IAA (0–0.1 μg ml−1) within the rhizosphere of plantlets increased the severity of the symptoms caused by P. ultimum, while higher concentrations (10 μg ml−1), applied either by drenching to the growing medium or by spraying on the shoot, reduced the symptoms caused by this pathogen.
In addition, the study demonstrated that P. ultimum produces IAA in liquid culture amended with L-tryptophan, tryptamine or tryptophol (200 μg ml−1) and in unamended culture. |
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| Keywords: | Damping-off Plant growth regulator Pythium ultimum Root rot Systemic response Tomato |
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