Hydroxysulochrin is a fungal metabolite and plant growth regulator that has been found in Aureobasidium.1 It inhibits tea (C. sinensis) pollen tube growth by 41%, but does not inhibit lettuce (L. sativa) seedling root growth, when used at a concentration of 100 mg/L.
References
1. Shimada, A., Shiokawa, C., Kusano, M., et al. Hydroxysulochrin, a tea pollen growth inhibitor from the fungus Aureobasidium sp. Biosci. Biotechnol. Biochem. 67(2),442-444(2003).
