اﻹﻛﺜﺎر اﻟﺨﻀﺮي اﻟﺪﻗﯿﻖ ﻻرﺑﻌﺔ اﺻﻨﺎف ﻣﻦ اﻟﺒﻄﺎطﺎ SolanumtuberosumL. ﺧﺎرج اﻟﺠﺴﻢ اﻟﺤﻲ Micro propagation of four Potato Cultivars Solanum tuberosum L. in vitro

Vegetative buds excised from tubers for four varieties of potatoes namely: Arnova, Brovento, Rivira and Bureen (after breaking the dormancy phase) which sterilized with 2% Sodium hypochlorite for 10 minutes and cultured in the MS mediumsupplemented with 0.5 mg/l of IAA or IBA with different concentration of BA, as well as control treatment in the initiation stage,while different concentrations of BA (0.0, 0.5, 1.0, 1.5, 2 mg/l) with 0.5 IAA mg/l in multiplication stage. All cultures incubated at a temperature of 2 ± 25º C and an illumination of 1000 lux for 16 hours/ day. Data ofmean number ofbranches shoot per plant and their length and leaves fortwo stages were investigated. The results showed that BA+ IAA at 0.5 mg/L for each one, gave the highest initiated percentage, shoot per plant ,length, reached 75%, 1.5 shoot / bud,2.21cm and 3.88,leaf/ bud, respectively. Results of multiplication indicated that there was a significant interaction effect of both cultivars and BA concentration on all characterizes, Based on this interaction, Arnova cultivars at 1.5 mg/L BA showed the highest mean of shoot per plant (4.0) While Rivera cultivars at 0.5 mg/L BA gave highest mean of length, leaves per plant reached 6.45cm,7.75 leaf/plant respectively.