EFFECTS OF DIFFERENT TEMPERATURES AND HORMONETREATMENTS ON BREAKING DORMANCY IN POTATO TUBERS

Mini propagation is a new method to produce potato. a factorialexperiment based on completely randomized block design with three replicationswas conducted to investigate the effect of two temperature levels (18 and 25°c)and six hormone treatments (h1: 0% of ethanol + 0 mg/l of gibberellic acid,h2: 0% of ethanol + 10 mg/l of gibberellic acid, h3: 0.5% of ethanol + 0 mg/l ofgibberellic acid, h4: 0.5% of ethanol + 10 mg/l of gibberellic acid, h5: 0.5% ofethanol + 20 mg/l of gibberellic acid, h6: 0.5% of ethanol + 30 mg/l of gibberellicacid) on mini tubers of two varieties of potato (agria and santé). the longestsprouts were about 14.13 mm long and they were produced by santé variety at18°c and h1 hormone level. sprouting percentage was higher in santé (75.69%)than in agria (59.72%). the highest average percentage of sprouted tubers (95%)was achieved at the temperature of 18°c and with h4 hormone treatment. santé hadthe shortest dormancy duration by using h1 hormone level at 18°c. applying h6hormone level at 18°c produced more sprouts per tuber in santé. santé was betterthan agria with or without hormone treatment in respect of all measured traits.higher ga concentration accelerates tuber sprouting in both varieties.