Genetic linkage mapping in peach using morphological, RFLP and RAPD markers

Area of Science:

• Plant genetics
• Molecular biology
• Genomics

Background:

• Peach [Prunus persica (L.) Batsch] genetic research is crucial for crop improvement.
• Previous genetic maps have limitations in marker density and scope.

Purpose of the Study:

• To construct a comprehensive genetic linkage map for peach.
• To identify and validate RFLP markers for use as anchor loci in diverse peach germplasm.

Main Methods:

• Construction of a genetic linkage map using 71 F2 individuals from a cross between 'New Jersey Pillar' and KV 77119.
• Analysis of 65 markers including RFLP, RAPD, and morphological markers.
• RFLP analysis utilized low-copy genomic and cDNA probes.

Main Results:

• A genetic map with 47 markers assigned to eight linkage groups, covering 332 centiMorgans (cM) of the peach genome.
• Average marker distance of 8 cM, with linkage detected between 'Pillar' (Pi), 'double flowers' (Dl), and flesh color (γ) loci.
• RFLP markers showed high polymorphism across 34 peach cultivars and in three other unrelated peach families (36-54% polymorphism).

Conclusions:

• The developed genetic map provides a valuable resource for peach genetic studies.
• RFLP markers from this map are highly polymorphic and suitable for use as anchor loci in diverse peach populations.
• This facilitates marker-assisted selection and accelerates breeding programs for desirable peach traits.