الفهرس 
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Abstract
In this study, responses of different in vitro grown potato cultivars cvs to salt stress (0.0, 1.0,2.0,3.0,4.g/L were investigate based on changes in shoot and root growth (first experiment) and microtuberization potential (second and third experiments). The results obtained indicate that increasing salt concentration in the tissue culture medium generally decreased plantlet fresh weight (FW), plantlet height, number of nodes per plantlet and root length. Shoot and root lengths were more affected by salt stress than nodes number and FW. Based on the percentage of shoot height value at the highest NaCl level(4.0g/L)potato cvs showed the following variable pattern of salinity tolerant: Arinda > Diamant > Sante > Bolista > Silvestaer > Arnova > Atlas > Proventa > Picasso > Spunta. Microtuber yield/jar and average microtuber weight increased at NaCl level from 1.0 to 3.0g/L .Based on their microtuberization potential, the two cvs Agria and Arinda were ranked as the most tolerant, and the cvs Safran was the most sensitive, salt stress also decreased chlorophyll and carotenoids contents, and increased proline accumulation, super oxide dismutase and catalase activities in potato tissue, depending on the cultivar.