Acknowledgements
We thank Amanda Cardoso who conducted a preliminary experiment that revealed a p-type ABA response in Umbellularia ; Mike Mickelbart and Gyeong-Mee Yoon for helpful comments on experimental design and text; and John Ross, without whose mentorship and advice on hormone analysis, this study would not have been possible. We acknowledge the use of the Metabolite Profiling Facility of the Bindley Bioscience Center, a core facility of the NIH-funded Indiana Clinical and Translational Sciences Institute for quantifying hormone levels. Support for this project came from the USDA National Institute of Food and Agriculture Hatch project 10104908 and the National Science Foundation grant IOS-2140119.