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.