Abstract
The quality and quantity of RNA are critical for successful downstream transcriptome-based studies such as microarrays and RNA sequencing (RNA-Seq). RNA isolation from woody plants, such as Pistacia vera, with very high amounts of polyphenols and polysaccharides is an enormous challenge. Here, we describe a highly efficient protocol that overcomes the limitations posed by poor quality and low yield of isolated RNA from pistachio and various recalcitrant woody plants. The key factors that resulted in a yield of 150 μg of high quality RNA per 200 mg of plant tissue include the elimination of phenol from the extraction buffer, raising the concentration of β-mercaptoethanol, long time incubation at 65 °C, and nucleic acid precipitation with optimized volume of NaCl and isopropyl alcohol. Also, the A260/A280 and A260/A230 of extracted RNA were about 1.9–2.1and 2.2–2.3, respectively, revealing the high purity. Since the isolated RNA passed highly stringent quality control standards for sensitive reactions, including RNA sequencing and real-time PCR, it can be considered as a reliable and cost-effective method for RNA extraction from woody plants.
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The authors thank for the financial support received from Iran National Science Foundation, Tehran, Iran to conduct the present work.
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Moazzam Jazi, M., Rajaei, S. & Seyedi, S.M. Isolation of high quality RNA from pistachio (Pistacia vera L.) and other woody plants high in secondary metabolites. Physiol Mol Biol Plants 21, 597–603 (2015). https://doi.org/10.1007/s12298-015-0319-x
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DOI: https://doi.org/10.1007/s12298-015-0319-x