Microbiome-mediated rootstock technology for enhanced tomato yield and disease resistance

Overview

This research investigates the critical relationship between tomato rootstock genetics and the plant's rhizosphere microbiome—the community of microorganisms living in the soil surrounding roots. The central hypothesis is that many of the well-known benefits of disease-resistant rootstocks are actually mediated by microbial communities rather than the rootstock genetics alone. By identifying genetic traits that can structure these microbial communities, this work aims to develop rootstocks that naturally suppress soil-borne pathogens, enhance tolerance to abiotic stresses such as drought or salinity, and improve tomato yield and fruit quality. The research addresses a significant gap in field-level understanding of how rootstock genetics and environmental microbiomes interact across diverse agro-ecosystems.

Technical specifications

Research approach:

• Utilizes a wide-cross tomato inbred advanced backcross population (IBC2S4) to explore quantitative trait loci (QTLs) that influence microbiome structure and composition
• Evaluates diverse rootstocks, including wild species-derived lines, for resistance to soil-borne diseases
• Employs three control varieties: Maxifort (industry-standard interspecific rootstock), 7-1K (advanced disease-tolerant line), and Mountain Fresh (common commercial hybrid)
• Conducts field experiments in western North Carolina production soils with established tomato cropping history
• Collects soil health metrics, disease phenotype data, and metagenomic sequencing to map microbiome communities
• Identifies marker-trait linkages connecting host genetics to beneficial microbial associations

Key value for partners:

• Access to a genetically diverse tomato population with characterized disease resistance
• Framework for breeding next-generation rootstocks that harness microbiome-mediated benefits
• Data and germplasm for developing sustainable disease management strategies

Technology readiness level

The research is currently in the field validation stage (TRL 4–6). Initial rootstock evaluations for soil-borne disease resistance have been completed, and resistant rootstocks have been identified. A rootstock breeding program using wild tomato species has been initiated. Future validation involves establishing field trials with diverse genetic lines and controls in a western North Carolina field with a history of tomato production. The team will collect integrated soil health, disease phenotype, and metagenomic data to identify genetic markers linked to beneficial microbiome structures. Additional field seasons and replicated trials will be needed to confirm findings before commercial rootstock varieties can be developed.