الفهرس 
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Abstract
This study was carried out during three successive summer seasons of 2013 till 2015, at the Experimental Station Farm, Faculty of Agriculture, Alexandria University, at Abies, Alexandria, .Egypt.
The main objectives of the present study were to investigate and realize the following points:
1. Estimation of the variability magnitudes in an original population of pumpkin Balady cultivar to determine the possibilities of conducting successful and efficient selection to improve the different characters in the tested population.
2. Evaluation of the effectiveness and efficiency of one cycle of simple recurrent selection and selfing with selection for two generations, as two breeding methods to improve some important characters of pumpkin cultivar ’Balady’.
3. Estimation of the genetic parameter heritability percentage in broad sense for the different studied characters through variance components methods.
4. Estimation of inbreeding depression in the second selfed generation of the selected progenies to determine their response to inbreeding for the different studied characters.
5. Estimation of the types of gene action involved in the inheritance of some growth and yield characters of pumpkin; additive gene action and non-additive gene action associated with inbreeding in second selfed generation progenies
6. Estimation of phenotypic correlation coefficients between all possible pairs of the different studied characters.