A Comparison of the Efficiency of Simple DNA Extraction Methods by Direct Amplification of rbcL gene in Capsicum annuum and Capsicum chinense
DOI:
https://doi.org/10.53848/ssstj.v13i1.1175Keywords:
DNA extraction, rbcL gene, NaOH, Capsicum, ChilliAbstract
Chilli landraces of Thailand are an essential spice in Thai cuisine. Taxonomically, they belong to the family Solanaceae, genus Capsicum. This study aimed to (i) survey the biodiversity of chilli varieties in Tambon Saylampong, Amphoe Thatako, Nakhon Sawan Province, and (ii) compare the efficiency of two DNA extraction methods, a commercial kit and NaOH extraction, through the direct amplification of the rcbL gene. A line transect method was used for the biodiversity survey and sample collection, covering a distance of one kilometer. Young leaves from each chilli variety were collected and used for DNA extraction using the commercial kit and NaOH extraction methods. The study found two chilli species comprising seven distinct varieties, Capsicum annuum consisted of five varieties: Chinda, Chee Fah, Khee Noo Si Moung, Khee Noo Khao, and Sai Pla Lai, and Capsicum chinense consisted of two varieties: Khee Noo Hom and Khee Noo Suan. DNA extracted using a commercial kit and NaOH extraction methods were available to measure the yield and purity by spectrophotometer. Regarding amplifying a partial sequence of the rcbL gene, DNA extracted using the commercial kit showed strong amplification in all samples. Some DNA samples of diluted DNA extracted using NaOH method were also successfully amplified, whereas all samples of non-diluted DNA extracted using NaOH method failed to amplify. These findings indicate that the commercial kit yields high-quality DNA suitable for polymerase chain reaction (PCR) applications. However, the NaOH extraction method presents a faster and more cost-effective alternative, though further optimization is needed to enhance its efficiency.
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