Relative Expression Analysis of Target Genes by Using Reverse Transcription-Quantitative PCR

Real-time PCR is a powerful technique used for quantification of defined nucleic acid sequences. Numerous applications of this method have been described including: gene expression studies, diagnosis of pathogens, and detection of genetically modified organisms or mutations. Here, we describe a simple and efficient protocol to determine gene expression in cereals, based on real-time PCR using SYBR^® Green dye. This technique provide an inexpensive alternative, since no probes are required, allowing for the quantification of a high number of genes with reduced cost.