High quality DNA is
essential for next generation sequencing, yet CTAB-based extractions from
polysaccharide- and metabolite rich plant tissues often yield fragmented,
contaminated DNA with high chaotropic agents. To address these limitations, we
present an minimal-reagent optimized CTAB protocol incorporating three key
refinements: extended gentle incubation with 3X CTAB buffer at 60–65 °C to
improve cell lysis, enhanced salt precipitation using 0.5×6 M NaCl and 0.1×3 M
sodium acetate and ethanol to increase DNA yield and remove polysaccharides and
secondary metabolites, and dual 70% ethanol washes with low-volume pipette to
eliminate residual salts.
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