Acknowledgment
We thank Ian Eggleston for helping with the ICP-MS analysis and Dr. Steve Eyles at the University of Massachusetts Mass Spectrometry Core Facility (RRID:SCR_019063) for providing technical expertise for analyzing 5-OP. This work was supported by the Lotta M. Crabtree fellowship, USDA-NIFA Hatch project (MAS #578), and USDA Forest Service, NRS.