Identifying molecular markers suitable for Frl selection in tomato breeding.

Area of Science:

• Plant genetics and breeding
• Molecular biology
• Agricultural science

Background:

• Modern plant breeding utilizes molecular markers for crop improvement.
• Fusarium crown and root rot, caused by Fusarium oxysporum f. sp. radicis-lycopersici (FORL), is a significant disease in tomato.
• A single dominant locus, Frl, confers resistance to FORL in tomato.

Purpose of the Study:

• To generate molecular markers associated with the Frl resistance locus in tomato.
• To accelerate the development of Fusarium crown and root rot resistant tomato cultivars.

Main Methods:

• Generation of an F2 mapping population from resistant and susceptible tomato parents.
• Whole-genome sequencing of parents and bulked F2 lines using next-generation sequencing (NGS).
• Mapping the Frl locus to a 900 kb interval on chromosome 9 and identifying polymorphic single-nucleotide polymorphisms (SNPs).

Main Results:

• The Frl locus was successfully mapped to a 900 kb region on chromosome 9.
• Polymorphic SNPs within the interval were identified, and markers co-segregating with resistance were developed.
• Developed markers showed successful application in commercial tomato varieties.

Conclusions:

• NGS technology is effective for rapid discovery of molecular markers in plant breeding.
• The generated markers are valuable tools for marker-assisted selection (MAS) in large-scale tomato breeding programs.
• These markers will aid in developing Fusarium crown and root rot resistant tomato varieties.