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The availability of high quality intact genomic DNA is aprecondition for almost every molecular genetic analysis.Many plant tissues, especially in recalcitrant longan, arerich in polysaccharide contaminants, making isolation ofgood quality DNA for PCR, gene mapping, diversityassessments, and other molecular analyses a challenge.The isolation of DNA from tissues with high levels ofpolysaccharides and polyphenols had been reportedusing traditional methods (Dabo et al., 1993; Lodhi et al.,1994; Permingeat and Romagnoli, 1998; Leftort andDouglas, 1999; Chaudhry et al., 1999; Khanuja et al.,1999; Zhang and Stewart, 2000; Michiels et al., 2003;Puchooa, 2004; Zidani et al., 2005; Cota-Sanchez et al.,2006; Kotchoni and Gachomo, 2009; Azmat et al.,2012), however, these methods did not give satisfactoryresults with longan, because they were not effective ineliminating the effects of polysaccharides and polyphenolsin the process of DNA isolation.PVPP was mainly applied in the beverage industry,where polyphenol adsorption leads to the stabilization ofbeer, wine, and fruit juices (Sarioglu 2007; Leiper et al.,2005). A research of comparison of polyvinylpolypyrrolidone (PVPP), silica xerogel and a polyvinylpyrrolidone (PVP)–silica co-product for their ability toremove polyphenols from beer was carried out (Mitchellet al., 2005), demonstrating that the PVPP had thegreater binding capability compared to the PVP-silica coproduct. Many researches on DNA isolation fromenvironmental samples were conducted, however, highquality DNA could not be achieved using previousmethods because these samples often contains enzymeinhibitors disruptive to downstream molecularapplications; to eliminate these inhibitors from sedimentsamples or cells collected from freshwater ecosystems,PVPP was used to eliminate the influence ofpolysaccharides and polyphenols during DNA extractionand the yield and quality of the resulting DNA weresatisfactory and suitable for PCR analysis, along withcloning and gene sequencing (Berthelet et al., 1996;Arbeli and Fuentes, 2007; Yilmaz and Phlips, 2009).These results indicate that PVPP was a valid reagent toeliminate the influence of polysaccharides and polyphenolstannins, proteins, and other secondary metabolites duringDNA isolation. However, PVPP was not used to removepolysaccharides and polyphenols in previous methods ofrecalcitrant fruits DNA extraction
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