1. 5.2. Variability of biochemical parameters contents in the cortex 273 In the cortex of tuberous roots (Table 4), the highest levels of phenols and flavonoids totals are produced 274 by the Douma variety;TFC: Total flavonoids content, and Proteins
2. Concerning the activity of guaiacol peroxidase;CAT activity is high in the TMS 96/0023 variety
3. For phenylalanine ammonia-lyase, activity is high in TMS 92/0057 variety 280 (0.145�0.01 ?A290/min/mg) and for total soluble protein;?A470/min/mg)
4. HCN: total 284 cyanide (mg/kg) and enzymatic activity (CAT: catalase, GPX: guaiacol peroxidase, PAL: phenylalanine 285 ammonia-lyase -?A/min/mg fresh weight). The values followed by the same letter in the column are not 286 significantly different;TFC: Total flavonoids content, and Proteins