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The leaf tissues of 4-month-old coffee plantswere ground under liquid nitrogen using a mortarand pestle, and total RNA was extracted using aGeneAll kit (GeneAll Biotechnology Co., Ltd.,Korea). The purity and concentration of totalRNA were accurately determined byspectrophotometric measurement using aNanoDrop US/ND-1000 spectrophotometer(Qiagen, USA). The complementary DNA(cDNA) was synthesized from 5 g of total RNAusing the reverse transcriptase and oligo dTprimers (Promega, USA).Identification and isolation of coffee genesThe full genome sequences of C. canephoraare found at the website (http://coffeegenome.org).The nucleotide sequences of ERD(early responsive to dehydration) family geneswere downloaded from the database and utilizedas a template to design the primers for cloningthe genes. The coding regions of ERD geneswere amplified by polymerase chain reaction(PCR) using the cDNA as a template and theprimers specific to each gene, and the resultingPCR products were ligated into the pGEM T-easyvector (Promega, USA). The amplification andsequence of target genes was verified by DNAsequencing.
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