A non-destructive genotyping system from a single seed for marker-assisted selection in watermelon

Area of Science:

• Plant breeding
• Genomics
• Molecular biology

Background:

• Genomic tools are crucial for advancing watermelon breeding.
• Current DNA extraction methods from leaf tissue are time-consuming and costly.
• A high-throughput genotyping system is needed for efficient marker-assisted selection.

Purpose of the Study:

• To develop an efficient and non-destructive DNA extraction protocol for watermelon seeds.
• To optimize DNA quality for polymerase chain reaction amplification.
• To facilitate marker-assisted selection in watermelon breeding programs.

Main Methods:

• Watermelon seeds were sectioned (⅓ or ½ removed) from the distal end for DNA extraction, while the proximal part was germinated.
• Various DNA extraction protocols were evaluated.
• A sodium dodecyl sulfate (SDS) protocol with 1% polyvinylpyrrolidone (PVP) was optimized.

Main Results:

• Removing ⅓ of the seed did not impact germination percentage or seedling vigor.
• The optimized SDS/PVP protocol yielded high-quality DNA suitable for microsatellite marker amplification.
• The protocol effectively prevented pericarp contamination.

Conclusions:

• An efficient, non-destructive DNA extraction method from watermelon seeds was successfully developed.
• This protocol streamlines genotyping, making it more accessible for marker-assisted selection.
• The findings contribute to accelerating genomic-assisted breeding in watermelon.