Root cooperation in a clonal plant: connected strawberries segregate roots

Area of Science:

• Plant Biology
• Ecology
• Evolutionary Biology

Background:

• Intraspecific competition can reduce plant performance.
• Clonal plants, connected via runners, may face competition among ramets.
• Selective avoidance of competition is advantageous but rarely demonstrated in plants.

Purpose of the Study:

• To investigate if physical connection in wild strawberry (Fragaria chiloensis) influences root segregation and clonal performance.
• To determine the role of carbon transport through runners in mediating root segregation.

Main Methods:

• Comparing root distribution and performance of connected versus physically separated ramets of F. chiloensis.
• Assessing the effect of artificial root zone division in containers.
• Examining root segregation in different F. chiloensis clones with varying degrees of carbon transport.

Main Results:

• Physical connection between F. chiloensis ramets induced significant root segregation.
• Root segregation led to increased clonal performance.
• Artificial separation of root zones did not yield the same performance increase.
• The effect of connection on root segregation was dependent on the degree of carbon transport between ramets, suggesting a signaling mechanism.

Conclusions:

• Clonal integration in F. chiloensis facilitates root segregation, reducing intraspecific competition.
• This coordination of below-ground foraging represents a form of root cooperation.
• The mechanism likely involves signal transport through runners, coordinating resource allocation.