[A simple and efficient method for preparation of plant RNAs].

Area of Science:

• Plant Molecular Biology
• Biochemistry

Background:

• Efficient isolation of pure plant RNA is crucial for molecular biology techniques.
• Traditional methods often struggle with plant tissues high in polysaccharides and polyphenols, leading to RNA degradation and contamination.
• RNase and protein contaminants can inhibit downstream molecular analyses.

Purpose of the Study:

• To develop a novel and efficient method for isolating high-quality plant RNA.
• To overcome challenges associated with RNA extraction from difficult plant matrices.
• To validate the purity and integrity of isolated RNA for downstream applications.

Main Methods:

• Incorporation of bentonite into the extraction buffer to bind proteins and inhibit RNase activity.
• Electrophoretic analysis of nucleic acids to assess RNA integrity.
• UV-Vis spectrophotometry (absorbance at 230, 260, and 280 nm) to determine RNA purity.
• Reverse Transcription Polymerase Chain Reaction (RT-PCR) to amplify a nuclear gene (18S rRNA gene) for functional validation.

Main Results:

• The bentonite-assisted method successfully isolated RNA from Jatropha curcas leaves, which are rich in polysaccharides and polyphenols.
• Electrophoresis and spectrophotometry confirmed high RNA integrity and purity, with no apparent DNA contamination.
• TRIZOL reagent, SDS-KAc solution, and Guanidine isothiocyanate solution failed to yield comparable results with the same plant material.
• RT-PCR amplification of the 18S rRNA gene demonstrated the suitability of the isolated RNA for molecular experiments.

Conclusions:

• Bentonite addition is an effective strategy for improving plant RNA isolation efficiency and purity.
• This method overcomes limitations of conventional techniques, particularly for recalcitrant plant samples.
• The isolated RNA is of sufficient quality for various molecular biology applications, including gene cloning and expression analysis.