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Integrating root exudation into belowground carbon economics
Zhihui Wen1, Jiayin Pang2, Jianbo Shen3
1State Key Laboratory of Nutrient Use and Management; College of Resources and Environmental Sciences; National Academy of Agriculture Green Development; Key Laboratory of Plant-Soil Interactions, Ministry of Education, China Agricultural University, Beijing 100193, China; Crop Functional Genomics, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn 53113, Germany.
Trends in Plant Science
|March 13, 2026
Summary
Root exudation, a key belowground process, is often overlooked in plant trait frameworks. This study proposes integrating root exudation into the Root Economics Space (RES) to better predict carbon allocation.
Area of Science:
- Ecology
- Plant Biology
- Soil Science
Background:
- Root exudation plays a crucial ecological role, influencing rhizosphere processes and belowground interactions.
- Current Root Economics Space (RES) frameworks primarily focus on morphological and chemical root traits, largely neglecting exudation.
- Inconsistent correlations exist between root exudation traits and the collaboration-conservation gradients within the RES.
Purpose of the Study:
- To investigate the role of root exudation in plant trait organization.
- To explore mechanisms causing inconsistencies between root exudation and the RES.
- To propose how root exudation can be integrated into or extend the RES framework.
Main Methods:
- Literature review and synthesis of existing research on root traits and exudation.
- Theoretical exploration of integrating root exudation into the RES framework.
- Formulation of testable hypotheses regarding root exudation's position within the RES.
Main Results:
- Root exudation represents a significant carbon investment with substantial ecological implications.
- Existing RES framework shows inconsistencies when incorporating root exudation traits.
- Two hypotheses are proposed: 1) integration into the current 2D RES, or 2) extension to a 3D RES.
Conclusions:
- Root exudation is a critical trait that needs to be incorporated into plant trait frameworks.
- The RES framework may require expansion to a 3D model to adequately represent root economics, including exudation.
- Further research is needed to fill knowledge gaps in belowground carbon allocation and trait-based predictions.
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