Vol. 2, Issue 6 (2017)
Preliminary selection of the orange cultivars using as female parents in diploids crosses and in triploidy program
Author(s): K Mahmoudi, N Handaji, N Arsalane, M Ibriz, T Aderdour, K Label, B Ait El Aouad, H Benyahya
Abstract: The genetic improvement of orange trees constitues the promising route of varietal diversification. In addition, the use of spontaneous triploidy enables to produce new seedless fruit varieties. Thus, the process of crossbreeding and rescuing immature embryos constitute the basic steps for the success of this method. As a matter of consequence, this article is aimed at selecting the best female parents of orange trees that will be used in a crossbreeding program.16 varieties of orange grown from the citrus collection of El Menzeh INRA field of Kenitra were subjected to a varietal evaluation during two years of study. The number of seeds per fruit is the main criterion of selection because it determines the new hybrids. Similarly, fruit quality criteria were studied. The variables under study are significant for all varieties of orange trees. Indeed, the sugar content varied from 9 to 12 for the sweetest oranges: Tarocco and Hamlin. Similarly the acidity oscillated from 0.81 to 2.34 with a low content for the varieties Thomson and Robertson. In addition, the average weight of the fruit fluctuated from 87 to 207 g with relatively high values for the Tarocco variety. Also, the number of seeds per fruit varied from 0 to 12. (Parson Brown and Pineapple).In addition to the good quality of the fruit, the Pineapple and Parson Brown varieties will be able to serve the crossbreeding program as female parents since they represent a great power to be pollinated.