First man made cereal is Triticale, produced by hybridization between Triticum and Secale cereale (rye). If Triticale is produced by hybridization between Triticum durum (4n) and Secale cereale (2n) then it is hexaploid Triticale. When it is produced by hybridization between Triticum aestivum and Secale cereale it in octoploid in nature.