The first successful regeneration of complete citrus plant-
lets from mature internodal stem segments was reported in
using sweet orange cv. Pineapple (Cervera et al. 1998). Af-
terwards, other investigators reported shoot induction from
citrus mature tissues especially in sweet orange cultivars
(Bond & Roose 1998, Almeida et al. 2003, Kobayashi et al.
2003, Curtis & Mirkov 2012). Such an extensive amount of
research on sweet orange micropropagation using mature
tissues maybe attributed to their high commercial value. De-
spite the narrow genetic base of sweet oranges, it has been
proven that the basal media components, hormonal re-
quirements and explant sources can greatly influence the
shoot induction efficiencies, making it necessary to deter-
mine these parameters precisely for each cultivar (Bordon et
al. 2000, Rodriguez et al. 2008).