Abstract
Resurrection plant Ramonda serbica is a suitable model to investigate mechanisms of desiccation tolerance, while variegated Pelargonium zonale has been proven to serve as an excellent model for the metabolite allocation between sink tissue and source tissue within the same organ. However, the genomes of these plants are still not sequenced, limiting their application in molecular studies. To investigate the transcript abundance by next-generation sequencing, high-quality RNA input is required. Leaves of both P. zonale and R. serbica are rich in polyphenols that interfere with high-quality RNA extraction by common protocols. Moreover, low water content and high amount of sugars and other osmoprotectants in desiccated R. serbica leaves present the additional challenge in total RNA extraction. Here, we evaluated and compared several already established TRIzol- and CTAB-based protocols aiming to develop the efficient, simple and low-cost methods for the extraction of the satisfactory yield RNA of great purity and integrity, required for the construction of high-quality cDNA libraries. Our results show that the CTAB-based protocol (i.e. CTAB 1b) enabled the extraction of high-quality RNA from photosynthetically active and non-photosynthetically active leaf sectors of P. zonale, with high RIN values. On the other hand, TRIzol-based protocol provided a high RNA yield with low contamination and high RNA integrity even in desiccated leaves of R. serbica. We envisage that the proposed protocol would be suitable for the RNA extractions from other desiccated organs (e.g. seeds, grains, pollen grains).
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Abbreviations
- βME:
-
β-Mercaptoethanol
- CIA:
-
Chloroform-isoamyl alcohol
- CTAB:
-
Cethyl-trimethylammoniumbromide
- DEPC:
-
Diethylpyrocarbonate
- EDTA:
-
Ethylenediaminetetraacetic acid
- NGS:
-
Next-generation sequencing
- PVP:
-
Water-soluble polyvinylpyrrolidone
- RT:
-
Room temperature
- RWC:
-
Relative water content
- PCR:
-
Polymerase chain reaction
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Acknowledgements
The authors would like to acknowledge Dr Milica Bogdanović (IBISS) for useful discussion regarding technical issues.
Funding
This work was funded by the Ministry of Education, Science and Technological Development, Republic of Serbia (Contract No. 451-03-68/2020-14/200053 and Bilateral project no. 451-03-01963/2017-09/09). M.V. wishes to acknowledge the financial support of Centre for Green Technologies, University of Belgrade.
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Vidović, M., Ćuković, K. Isolation of high-quality RNA from recalcitrant leaves of variegated and resurrection plants. 3 Biotech 10, 286 (2020). https://doi.org/10.1007/s13205-020-02279-1
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DOI: https://doi.org/10.1007/s13205-020-02279-1