Salt-tolerant tomato lines with enhanced root water uptake and photosynthetic capacity under salinity stress
Research collaboration offering tomato introgression lines (SG18-247, SG18-197) and transcriptomic expertise to identify molecular traits for salt tolerance breeding. The lines show improved root hydraulic conductivity and photosynthetic rate under salt stress compared to standard cultivars.
Overview
This research program addresses a critical challenge in agriculture: improving crop performance under salt stress. The project focuses on tomato introgression lines (ILs) derived from the salt-tolerant wild species Solanum galapagense LA1141 crossed with the commercial cultivar OH8245. Two key ILs have been characterized: SG18-247, which exhibits 60% higher root hydraulic conductivity and 22% higher photosynthetic rate than OH8245 under salt stress, and SG18-197, which does not show these improvements. The goal is to identify the molecular traits responsible for enhanced water uptake and carbon assimilation under salinity conditions, enabling breeding programs to develop salt-tolerant tomato varieties.
Technical specifications
Key research capabilities:
- Plant material: Two pre-selected tomato introgression lines (SG18-247 with high salt tolerance and SG18-197 without improved tolerance) plus parental lines (cv. OH8245 and S. galapagense LA1141)
- Physiological validation: Stomatal conductance and photosynthetic rate measurement using infrared gas analyzer (LI-6400, LI-COR)
- Root hydraulics: Custom-made pressure chambers for root system hydraulic conductivity measurement
- Stress protocols: Controlled salt treatments using nutrient solution plus 60 mM NaCl and 30 mM CaCl2 over 3-4 week exposure periods
- Molecular analysis: Transcriptomic profiling of roots and leaves after 21 days of salt exposure to identify gene expression patterns and pathways linked to salt tolerance
- Statistical validation: ANOVA-based assessment of genotype and treatment effects with post-hoc comparison of response variables
Collaborative expertise:
- Dr. Barrios lab (University of Nevada, Reno): physiological screening and transcriptomic analysis
- Dr. Francis lab (Ohio State University): introgression line development and genetic resources
Technology readiness level
The research is at an advanced validation stage. Initial physiological screening of ten introgression lines has been completed in two trials, confirming significant differences in salt stress response. The next phase involves transcriptomic analysis to identify specific molecular markers and pathways. This work directly supports tomato salt tolerance breeding programs and has potential applications for other crops facing salinity challenges in arid and semi-arid agricultural regions.
About University of Nevada Reno
University of Nevada, Reno is a comprehensive public land‑grant research university (Carnegie R1) serving the state from its Reno campus. Industry connects through an applied research center that brokers access to co‑located labs, instrumentation and pilot‑scale resources, and a downtown innovation hub that convenes startups and corporates. The university’s integration with a major regional health system supports clinical education and research, while a statewide Experiment Station and Extension network links faculty with communities and industry in all 17 counties. Research is supported by competitive federal funding. A dedicated technology transfer office and an affiliated commercialization non‑profit provide IP, licensing and startup support.
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