An improved Shorea robusta genomic DNA extraction protocol with high PCR fidelity

Area of Science:

• Plant molecular biology
• Biotechnology
• Forestry

Background:

• Shorea robusta (Sal) is a vital timber species rich in compounds that hinder DNA extraction.
• High-quality genomic DNA is essential for molecular studies, including simple sequence repeat (SSR) marker screening.
• Existing DNA extraction methods may not be optimal for Sal due to its complex tissue composition.

Purpose of the Study:

• To optimize a high-throughput DNA extraction protocol for Shorea robusta.
• To ensure the extracted DNA is suitable for downstream molecular applications, such as SSR marker analysis.
• To provide a reliable method for obtaining high-quality DNA from both fresh and dry Sal leaves.

Main Methods:

• Optimization of a DNA extraction protocol using fresh and dry Shorea robusta leaves.
• Assessment of DNA yield and purity using spectrophotometric measurements (A260/A280 ratio).
• Validation of the protocol's suitability for polymerase chain reaction (PCR) amplification with microsatellite markers.

Main Results:

• The optimized protocol provides a high DNA yield of approximately 1500 µg per gram of leaf tissue.
• The extracted DNA exhibits good purity, with A260/A280 ratios between 1.70 and 1.91, indicating minimal contamination.
• The DNA is suitable for PCR amplification, as demonstrated by successful microsatellite marker analysis.

Conclusions:

• A simple, rapid, safe, and reliable high-throughput DNA extraction protocol for Shorea robusta has been successfully developed.
• The protocol yields high-quality DNA suitable for various DNA-based studies, including SSR marker-based genome characterization.
• This method facilitates further molecular research and genetic studies within the Shorea genus and Dipterocarpaceae family.