الفهرس 
Introduction
Genetic materialsOnly 14 pages are availabe for public view
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Abstract
The initiation of pure lines are often considered a first step in genetic improvement of vegetable crops. These pure line are genetically pure or homozygous plants resulting from continuous self-fertilization for several generations, this work takes more than seven years to produce such pure lines.
The utilization of biotechnology and new in vitro culture technique is necessary to reduce the required time needed to obtain pure lines. One of the most successful methods to obtain such pure lines is anther culture techniques which considerably speed up the production of haploid plants which followed by duplication in order to produce the doubled haploids (DHs) plants for breeding programs.
Also, knowledge about the mode of gene action of economical traits, which directly contributes towards yield and fruit characteristics in any crop like summer squash helps to formulate the genetic basis for breeding.
Therefore, this investigation aimed to evaluation of some Squash varieties and their hybrids for their response to anther culture and some agronomic traits.
Subsequently, nature of gene action of these traits could be estimated in order to determine the proper breeding program for improvement these traits. For these aims, four squash varieties belong to species (Cucurbita pepo, L.) were used.
This varieties included two American varieties (White Bush and White Bush Scallop), as well as two local varieties (Eskandrani and Baladi).