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The potato (Solanum tuberosum) is the 3 rd most important crop worldwide, and Phytophthora infestans is the most devastating pathogen to potato crops. In this study, it has identified markers for resistance and susceptibility to late blight using potato genotypes that differ in their resistance/susceptibility to Phytophthora infestans. Using Fourier transform infrared spectroscopy, many absorbance bands have been identified as specific to resistant potato plants, and others were specific to susceptible potato plants. For each case (resistance/susceptibility), three bands were identified: 941-1180 cm , respectively. As it is a simple, rapid, and inexpensive technology, FTIR (Fourier Transform Infrared) spectroscopy offers an excellent opportunity for studying potato resistance/susceptibility to late blight.

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