RNA Isolation Techniques in Plant Tissues

Isolating intact, high-purity RNA from plant tissues underpins modern molecular biology, enabling transcriptome profiling, gene expression analysis and biotechnological applications. Plant matrices are often rich in polysaccharides, polyphenols and secondary metabolites that co-precipitate with nucleic acids, inhibit enzymatic reactions and compromise downstream processes such as cDNA synthesis and quantitative PCR. Classical approaches employ detergents and chaotropic agents—cetyltrimethylammonium bromide (CTAB), phenol/chloroform or guanidine isothiocyanate—to lyse cells and separate RNA from contaminants. Commercial kits, based on silica columns or magnetic beads, offer convenience but can falter with recalcitrant tissues. Alternative methods combine CTAB or SDS lysis with lithium chloride precipitation to enrich RNA, while polyvinylpyrrolidone (PVP) is often added to sequester polyphenols. Recent adaptations include phenol-free protocols for toxic-chemical–sensitive laboratories and high-throughput platforms in 96-well formats. Advances focus on improving yield, purity (A260/A280 and A260/A230 ratios >1.8), and RNA integrity (RIN values ≥7) across diverse species—ranging from metabolite-rich fruits and seeds to woody and desert-adapted trees.

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RNA Isolation Techniques in Plant Tissues publication trend

The graph below shows the total number of articles in rna isolation techniques in plant tissues across all publications each year (not limited to Nature Index journals).

Technical terms

CTAB: Cetyltrimethylammonium bromide, a cationic detergent used to lyse cells and remove polysaccharides.

TRIzol: A monophasic reagent containing phenol and guanidine isothiocyanate for simultaneous disruption of cells and denaturation of proteins.

SDS-LiCl method: A protocol combining sodium dodecyl sulfate lysis with lithium chloride precipitation to enrich RNA and exclude DNA and proteins.

PVP: Polyvinylpyrrolidone, added to extraction buffers to bind and remove polyphenolic compounds.

Phenol/chloroform-free protocol: An extraction approach that avoids toxic solvents, often replacing them with safer buffers and salts for RNA isolation.

RIN (RNA Integrity Number): A metric from electrophoretic analysis indicating RNA quality on a scale from 1 (degraded) to 10 (intact).

References

1. DNA-free high-quality RNA extraction from 39 difficult-to-extract plant species (representing seasonal tissues and tissue types) of 32 families, and its validation for downstream molecular applications. Plant Methods (2023).
2. An Optimized and Cost-Effective RNA Extraction Method for Secondary Metabolite-Enriched Tissues of Norway Spruce (Picea abies). Plants (2024).
3. A phenol/chloroform-free method to extract nucleic acids from recalcitrant, woody tropical species for gene expression and sequencing. Plant Methods (2019).