Field collection,preservation and large scale DNA extraction procedures for cassava (Manihot esculenta Crantz.)
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Bhattacharjee, R., Ferguson, M., Gedil, M., Dumet, D. & Ingelbrecht, I. (2009). Field collection, preservation and large scale DNA extraction procedures for cassava (Manihot esculenta Crantz.). African Journal of Biotechnology, 8(15), p. 3424-3430.
Permanent link to cite or share this item: http://hdl.handle.net/10568/90807
Some genetic studies using molecular methods such as diversity assessment or marker-assisted selection require collection of a large number of samples from fields located in the vicinity or in remote areas, followed by isolation of good quality DNA in a short time span. In the present study, different tissue preservation methods were compared for subsequent DNA extraction using a modified CTAB method in two 96-well plates, following grinding of leaf tissues with a GenoGrinder 2000. We found that preservation of leaf tissues in NaCl-CTAB-azide buffer (as described in Rogstad, 1992) at 4°C is a better storage procedure than preservation at -20°C to obtain good quality DNA. Comparison of DNA extraction with or without use of phenol revealed that the quality of DNA was not drastically affected when non-phenol extraction protocol was used and did not affect PCR amplification. Thus, the recommended DNA extraction procedure allowed us to process 192 samples per day at a cost of $0.80 per sample, with an average yield of 1.8 g, suitable for both PCR and genotyping.
Investors/sponsorsGlobal Crop Diversity Trust
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