الفهرس 
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Abstract
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Cotton is an economic plant of world importance. In Egypt, cotton is one of the most important genotypes. Knowledge of genetic diversity, technological and economic parameters as it plays a vital role in our relationships among breeding materials. The total cultivated area began to decline, which mean analysis is a quantitative genetic method be requires working to increase the production of unit able to estimate additive, dominance and epistatic area to compensate for the shortfall in the effects
The present experiments were carried out at the Agricultural Botany Department, Faculty of Agriculture, Saba Basha, Alexandria University, Egypt and Department of Plant production, Faculty of Agriculture, Saba Basha, Alexandria University, Egypt. Five commercial varieties representing the two categories of Egyptian cotton were used, namely: Giza 92 and Giza 88 as extra-long staple length (over 13/8-inch fiber length) and Giza 86, Giza 95 and Giza 90 as long staple length (11/4 - 13/8 inch) fiber length. These studies were conducted during 2015 up to 2018 to assessment of genetic differentiation of Egyptian cotton via technological, biochemical and molecular markers. The main objectives of the present research are to: study some technological parameters between some Egyptian cotton varieties, assessment of morphological variations between the tested cotton varieties, determine the genetic differences between cotton varieties using isozyme systems, calculate the genetic polymorphism with/within cotton varieties based on molecular markers, calculate the genetic distance and similarity based of different morphological, technological, biochemical and molecular markers
Cotton seeds of Egyptian cotton varieties (Gossypium Barbadense, L.) were planted on four replicates each in pots. Five morphlogical characters were musered for the current cotton culivars such as plant height (cm), root length (cm), leaves number and bolls number/plant.
Fiber properties of the five cotton varieties under study were determined by the High-Volume Instrument (H.V.I.). Samples were preconditioned for 48 hours at least under the standard conditions of 65 %± 2 % relative humidity and 20 ± 1ºC temperature before testing. The fowling technological parameters were calculated micronaire, maturity %, UHML (mm), uniformity, short fiber%, fiber strength (g/tex), fiber elongation, Rd %, (Reflectance degree) and +b (Degree of yellowness)