B. GOKULAKUMAR* , R. NARAYANASWAMY**

*Department of Physics, **Department of Engineering Physics, Annamalai University, Annamalainagar – 608002, Tamilnadu, India

Abstract. A study has been made for five different sesame verities namely CO-1, VRI-1, VRI-2, TMV-3 and TMV-4 were grown in trial fields with three different manure treatments viz. control (T1), chemical fertilizer (T2) and organic manure (T3). From the root rot diseased roots, the compound identified and quantified from the five sesame varieties by FT-IR analysis and the spectra were recorded for all the samples in the range of 4000 – 400 cm^–1. The pronounced peaks belonging to vibration of C=O , C–OH, C–N, and N–H were present in the spectra of diseased roots indicates the presence of diketopiperazine. Whereas, the marked reduction in intensities of the absorption peaks in the spectra of organic manure treated varieties indicates the reduction in amount of diketopiperazine. Also an attempt has been made to correlate the extinction coefficient (K) values with the changes in diketopiperazine of the root rot diseased roots in sesame varieties.
Key words: FT-IR, sesame, root rot disease.

Corresponding author’s e-mail: profrns@rediffmail.com

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