Genetic transformation and regeneration protocols for bacterial wilt-resistant melon accessions
Development of tissue culture, regeneration, and genetic transformation protocols for four melon accessions identified as resistant to bacterial wilt disease. This work enables breeding of resistant commercial melon cultivars using novel genetic diversity.
Overview
Bacterial wilt, caused by Erwinia tracheiphila, is one of the most devastating diseases of cucurbits, with melon and cucumber being particularly susceptible. Through prior greenhouse screening of 118 melon accessions, four lines (Ames 13299, PI 370441, PI 230186, and PI 200814) were identified as highly resistant based on three disease-resistance parameters. Because these accessions are not commercial cultivars, their suitability for genetic transformation and in vitro regeneration has not been established. This project aims to close that gap by developing reliable tissue culture, plant regeneration, and genetic transformation protocols tailored to these resistant lines, enabling their use in breeding programs that deliver disease-resistant melon cultivars to growers.
Technical specifications
Research objectives:
- Establish tissue culture systems for the four resistant accessions and a common commercial cultivar such as Athena for comparison
- Test existing cucurbit regeneration protocols across multiple explant types; develop new protocols if none of the available methods succeed
- Apply the validated regeneration protocol to develop a genetic transformation method using available gene constructs
- Lay the groundwork for incorporating resistance traits into commercial breeding pipelines
Key features:
- Exploits previously uncharacterized genetic diversity for bacterial wilt resistance in melon
- Builds on established cucurbit transformation and regeneration methodology while addressing species- and cultivar-specific differences
- Produces protocols and transformed lines that can support future cultivar development
Technology readiness level
The resistant melon accessions have already been identified and characterized through validated greenhouse screening. The current project focuses on protocol development, representing early-stage applied research. Successful completion will advance the technology toward readiness for use in breeding programs and downstream trait improvement.
About Tennessee State University
Tennessee State University conducts applied and fundamental research across agriculture and environmental sciences, engineering and computer science, education and learning sciences, and health and behavioral studies. Its land‑grant programs include agricultural research and Cooperative Extension with long‑running USDA‑supported projects in plant science, urban agriculture, food safety, and natural resource management. Notable research units include the College of Agriculture’s research programs and extension centers, the Center of Excellence for Learning Sciences, and the Center of Excellence in Information Systems, along with specialized facilities such as the Otis L. Floyd Nursery Research Center. TSU investigators regularly secure funding from federal agencies including USDA‑NIFA, NSF, NIH, and the State of Tennessee, often in partnership with regional industry and community organizations. Technology transfer and outreach emphasize practical solutions in sustainable agriculture, biotechnology, data and information systems, and workforce development for Middle Tennessee and beyond.
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