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VOL. 2, ISSUE 1 (2026)
Plant genomic DNA extraction protocol for genotyping by sequencing as policy issues & planning in agriculture in India
Authors
Trilok Nath Rai, Kedar Nath Rai, Sanjeev Kumar Rai, Rajeev Kumar Rai, Mohit Singh
Abstract

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.

The optimized CTAB method yielded genomic DNA in Indian bean (Lablab purpureus) at 1481.65±673.98 ng/µL with purity (A260/280 = 2.1±0.07; A260/230 = 2.09±0.27). RNase A treatment increased yield to 1965.33±803.58 ng/µL while maintaining purity during −20 °C storage. Genotyping by sequencing (GBS) using MspI/PstI digestion of gDNA from 145 parental and recombinant inbred lines generated 87.5 M and 86.0 M reads per Ion 540 chip with ~1.09±0.57 M raw reads per sample (Phred≥15) and ~0.68±0.36 M high-quality reads retained after preprocessing (Phred ≥25). The protocol requires minor adjustments for recalcitrant tissues but remains a reliable, cost-effective, and scalable solution for SNP discovery, particularly in resource-limited genomics laboratories.
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Pages:24-34
How to cite this article:
Trilok Nath Rai, Kedar Nath Rai, Sanjeev Kumar Rai, Rajeev Kumar Rai, Mohit Singh "Plant genomic DNA extraction protocol for genotyping by sequencing as policy issues & planning in agriculture in India". World Journal of Research in All Subject, Vol 2, Issue 1, 2026, Pages 24-34
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