Acknowledgements
We thank the FRED initiative for sharing trait data about root traits.
We thank Walter Judd, Suzanne Koptur, Aaron Hogan and Alan Franck for
their insightful comments in previous versions of this manuscript. This
research was supported by grants from the US National Science Foundation
(DEB-0918240, DEB-0918878, DEB-1549964), US Department of Energy
(DE-SC0004335), and the Natural Sciences and Engineering Research
Council of Canada (NSERC RGPIN-2018-04620).
sSTATEMENT OF AUTHORSHIP
O.J.V.B., and C.B.B. conceived the idea, O.J.V.B and H.M. collected the
data, and O.J.V.B., C.B. and H.M. conducted the statistical analyses and
graph configuration. All authors interpreted results and contributed to
the writing of the manuscript.