ivanovicl

Hi. Over the course of 12 weeks I have conducted a chemistry experiment for school on the effect that the auxin Indole-3-acetic-acid has on plant growth (tommy toe tomato plant). This is because IAA is meant to increase plant growth by promoting cell division, expansion etc. We also created a nutrient solution. However, I found that instead of increasing plant growth, yeast precipitates have formed within the solution taking all the nutrients from the plant and effectively killing it. My question therefore is this, in terms of chemistry, why is the addition of Indole-3-acetic-acid producing yeast?