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. 2019 Oct 11;10:1215. doi: 10.3389/fpls.2019.01215

Figure 1.

Figure 1

Fine-root economic traits including root diameter, root tissue density, specific root length, and root nitrogen content together with expanded circles portraying differing levels of mycorrhizal associations are depicted in two contrasting root types. Economic traits are commonly expected to define strategies for effective resource acquisition belowground. However, it is unclear how these traits integrate at the level of individual roots (e.g., first-order roots) and how these traits then relate to associations with mycorrhizal fungi which may provide additional resource uptake capacity with increasing rates of colonization and production of external hyphae.