EVALUATION STUDIES OF ORANGES VARIANTS (Citrus sinensis (L) Obsbeck) IN THREE LOCATIONS IN MOROCCO

Sweet oranges (Citrus sinensis) occupies a prominent position in the citrus sector in the world. The objective of this study was to determine the extent of genotype × environment (G×E) interaction that influences oranges fruit quality. The experiments were conducted in three location namely: El Menzeh, SidiAllal Tazi, and Sept Garden. 20 orange variants from apomictic seedlings of three varieties of orange (Sangunilli, Grosse Sanguine, Salustiana) were evaluated for fruit quality. The results revealed that there were significant differences (P < 0.05) among locations. For the first variants group of Sanguinilli, no significant difference were found among the genotypes for the all characters studied at the three locations. While, there was significant difference among genotypes between the environment. Genotypes x environment interaction also did not showed significant effects for the variables except of average fruit weight. In Grosse Sanguine variants, no significant difference between genotypes for all studied traits. Also, interaction (GXS) is not significant. But, Sites reveal significant difference. For Salustiana variants, no significant difference between genotypes for all studied traits. These results have shown an environmental effect on the variability of fruit quality. The majority of quality characters are relatively stable in Tazi and Menzeh than in Sept Garden. The study of the genotypes selected based on the parameters studied indicates the existence of a great diversity of response to the three environments complicated by the interactions of the genotypes with the environment.