Effect of salinity on physiological characteristics, yield and quality of microtubers in vitro in potato

摘要: In vitro microtuberization provides an adequate experimental model for the physiological and metabolic studies of tuberization preliminary screenings potential potato genotypes. The effects saline stress at 0–80 mmol concentration on in two cultivars were investigated this study. With increase salt concentration, was either delayed by 5–10 days (20 40 NaCl) or inhibited completely (80 addition to reduction microtuber yields. genotypes studied showed different trends total soluble sugars, sucrose starch contents microtubers under NaCl stress, while glucose fructose levels remained unchanged. vitamin C content reduced stress. Salinity applied from 20 60 progressively increased proline malondialdehyde (MDA) both cultivars. genotype Zihuabai, a low mmol) led significant peroxidase (POD) polyphenoloxiadase (PPO) activities, Jingshi-2, PPO activity decreased with concentrations. Genotype Zihuabai exhibited higher tolerance than Jingshi-2 conditions. These results could be used selections breeding programmes.