Tree Physiology 2017; doi: 10.1093/treephys/tpw108

The below reference was missing from the reference list:

Karst J, Gaster J, Wiley E, Landhäusser SM (2017) Stress differentially causes roots of tree seedlings to exude carbon. Tree Physiol 37: 154–164. DOI: https://doi.org/10.1093/treephys/tpw090

This has now been corrected online.

The author apologizes for this error.