الفهرس 
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Abstract
This study is designed to identify improved and adapted clones that will satisfy the needs of commercial production. In the final evaluation, special consideration was given to quality parameters. The focus in this
study was on the tuber weight and specific gravity properties.
Out of 2,000 seedling tubers derived from the open-pollinated true
seeds in 1995, nine selections were selected and evaluated in 1997. Also,
four selections were selected in 1997 from 8 potato hybrids (true seeds
grown) in 1997. These selected clones were differed in number of tubers
per plant, tubers weight per seedling, skin colour, flesh colour and tuber
type. The data show that seven selections were round, three were long
and three were oblong types. All clones which derived from openpollinated
seeds had cream skin colour and six of them had yellow flesh
colour and the flesh of the rest selections were white. In the mean time,
two red skin selections were maintained. The flesh colour of these two
selections was white. This studry is the first breeding effort to improve
potato productivity in Egypt.
The present study of proteins and isozymes variation by gel
electrophoresis has proven that this technique is very useful in measuring
gentic variation and geneotypes discrimination in potatoes.