Abstract Bell pepper with the scientific name of Capsicum annuum L is one of the 5 important commercially cultivated species of the genus Capsicum and an annual plant belonging to the family Solanaceae. This plant has 2n=2x=24 chromosomes, which is highly regarded not only because of its economic value, but also because of the nutritional value of its fruits, as well as an excellent source of natural colors and antioxidant compounds. Bell pepper is naturally a self-pollinating plant; however, depending on the number and activity level of pollinating bees, different amounts of out crossing have been observed in this plant. This research was conducted in order to eva‎luate seed production and populations resulting from inbreeding in commercial bell pepper hybrids. In this regard, greenhouse cultivation with 6 high-yielding genotypes of Lorca and Nirvin (red), Turmes and Taranto (yellow), and Paramo and Aranquia (Orange) was implemented in a randomized complete block design (RCBD). Simultaneously with the sexual maturity of the plant, two flowers were selected; The fruits obtained from these two flowers were bagged and other flowers of the plant were removed to ensure the full ripening of the fruit. The seeds obtained from the selected fruits of the F1 generation plants were harvestedand the selected seeds were divided into two groups of large and small seeds and cultivated separately. In the second generation, selection of flowers and self-fertilization was done again. The results of analysis of variance showed that the seed size (large seed vs. small seed) was significant on the two traits of number and size of seeds in the F2 generation. The analysis of variance of selected male fertile and male sterile single plants in the second generation of cultivation showed significance for most of the traits. The mean comparison of morphological characteristics of male fertile plants showed that in the selected single plants, the seed weight per fruit was higher in Nirvin and Lorca cultivars with large seeds and in Taranto, Turmes, Paramo and Arancia cultivars with small seeds. The mean comparison of male sterile and male fertile plants showed that the length and width of fruit in male fertile fruits was greater than that of male sterile plants, and the height of sterile plants was greater than that of male fertile ones. On the other hand, sterile fruits had more antioxidant properties compared to male fertile fruits in Lorca, Taranto, Paramo and Aranquia cultivars. The pericarp thickness of sterile fruits was higher compared to male fertile fruits in Nirvin and Arancia cultivars and the stem diameter of male sterile plants in Lorca, Taranto and Paramo cultivars was greater compared to male fertile plants. Also, the weight of parthenocarp fruits was lower than that of male fertile fruits. Analyzing the morpho-physiological traits of male-fertile plants into main components shows that there is a high and negative correlation between fruit and seed production. Comparison of the average morpho-physiological traits of male fertile plants in different fruit colors shows that genotypes with yellow color have more antioxidant, phenol, flavonoid and fruit yield than other colors. Also, genotypes with orange color had higher seed yield. According to the results obtained from the harvested fruit data from the F1 and F2 generations, Turmes (yellow) and Arancia (orange) cultivars were more stable and had the lowest percentage of fruit yield loss after selfing. Of course and in general, the fruit yield in the F2 generation decreases compared to the F1 generation, but in the genotypes of Nervin 48.2%, in Lorca 23.3%, in Tormes 16.02%, in Taranto 39.0%, in Aranquia 36.6% and in Paramo 12.6% of the plants had a higher performance than the F1 generation.

محمدرضا سبزعليان دستجردي , احمد ارزاني

مريم حقيقي

اقافخر ميرلوحي فلاورجاني , مهديه غلامي