Related Experiment Video
Updated: Nov 4, 2025

A Simple Protocol for Mapping the Plant Root System Architecture Traits
Published on: February 10, 2023
Root anatomy helps to reconcile observed root trait syndromes in tropical tree species
Oscar J Valverde-Barrantes1, Louise Authier2, Heidy Schimann2
1Institute of Environment, International Center of Tropical Biodiversity, Department of Biological Sciences, Florida International University, Miami, FL, 33199, USA.
Premise:
Studying the organization of functional traits in plant leaves and stems has revealed notable patterns linking function and form; however, evidence of similarly robust organization in root tissues remains controversial. We posit that anatomical traits in roots can provide insight on the overall organization of the root system. We hypothesized that size variation in the tissue outside the stele is related in a nonlinear fashion with functional traits associated with direct resource uptake, including a negative relationship with root architectural traits, and that similar relationships detected in tropical areas also hold true in other biomes.
Methods:
We addressed our hypotheses using empirical data from 24 tropical tree species in French Guiana, including anatomical measurements in first order roots and functional trait description for the entire fine root system. In addition, we compiled a global meta-analysis of root traits for 500+ forest species across tropical, subtropical, and temperate forests.
Results:
Our results supported the expected nonlinear relationships between cortical size and morphological traits and a negative linear trend with architectural traits. We confirmed a global negative relationship among specific root length (SRL), diameter, and tissue density, suggesting similar anatomical constraints in root systems across woody plants. However, the importance of factors varies across biomes, possibly related to the unequal phylogenetic representation across latitudes.
Conclusions:
Our findings imply that the rhizocentric hypothesis can be a valuable approach to understand fine root trait syndromes and the evolution of absorptive roots in vascular plants.
Related Concept Videos
Basic Plant Anatomy: Roots, Stems, and Leaves
Primary and Secondary Growth in Roots and Shoots
Water and Mineral Acquisition
Epiphytes, Parasites, and Carnivores
Introduction to Seed Plants
Phylogeny

