Indoleacetic Acid (IAA)
Definition - What does Indoleacetic Acid (IAA) mean?
Indoleacetic acid or Indole-3-acid (3-IAA or IAA) is a naturally-occuring hormone of plants in the auxin class. It is a colorless solid and a derivative of indole, which contains a substituent of carboxymethyl. It is via IAA that plants can produce tryptophan and also gives plants the ability to cope with stress.
WineFrog explains Indoleacetic Acid (IAA)
As grape vines are widely cultivated in poor soils and in harsh climates, it is crucial that Indole acetic acid (Indole-3-acetic acid) is naturally produced in the vine. In order to produce quality wines and quality grapes, they must be under constant stress, including well-draining soils with poor nutrients. This allows for the vine to search out and dig into the earth with their roots for necessary and vital elements.
The stress-tolerant acid of Indole acetic acid is crucial for the survival of the grape vine, as stress can result in cell death.