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<p class="Default">Plants respond to a wide variety of pathogen attack. They show the local response in originally attacked plant organ and systemic response in unaffected plant parts with the <em>de novo </em>production of phytochemical compounds. Phenolics (polyphenols) play an important role in the defense mechanism of the plants. So, this study was carried out to analyze the metabolic modifications in <em>Sesame </em>plant after the infection with the pathogen (<em>Macrophomina phaseolina</em>) by estimating the levels of polyphenol in 7 days and 14 days old <em>Sesame </em>plants. The polyphenol contents in infected plants are considerably exceeded in contrast to control plants. This <em>in vivo </em>study of <em>M. phaseolina </em>infection reveals the differences of resistance levels in <em>Sesame </em>against the pathogen. The obtained results give important information concerning the plant-pathogen interactions, in the defense response for <em>Sesame </em>improvement programs seeking the adaptation to the diverse range of fungal attack along with adverse environmental factors.</p>International Journal of Environment Vol.4(4) 2015: 1-18