Evaluation of the Pectiform effect in the in vitro establishment of axilary buds of sweet potato clone CENSA 78-354

Abstract

With the purpose of studying the effect of different Pectimorf dose in the establishment and budding of axillary buds of sweet potato starting from buds, tuberous roots belonging to the clone CEMSA 78-354 were collected and placed in flasks with water in the laboratory under semicontrolled conditions to induce the sprouting of the buds. Later on, axillary buds of the buds of the tubers (establishment) and axillary buds coming from in vitro plants (multiplication)were selected as sowing material (explants), which were sowed in the Murashige and Skoog culture medium containing the MS salts, thiamin (1 mg.l-1), myoinositol (100 mg.l-1), sucrose (3%), gelryte (2 g.l-1), giberelic acid (10.0 mg.l-1) and indol-3-acetic acid (0.05 mg.l-1) and the already mentioned culture medium without the previously refered regulators of the growth with different Pectimorf concentration: 5.0, 10.0 and 15.0 mg.l-1. The morphological behavior of the in vitro plantas was evaluated to the five, fifteen and thirty days after established the buds under in vitro conditions , and different variables related with the in vitro growth of the buds were analyzed, among which we have: number of sprouted buds, height of the in vitro plants (cm), number, longitude and width of the leaves, buds with roots, longitude of the roots (cm) and longitude of the petiole (cm). The best results were obtained when using the axillary buds coming from budding of tuberous roots in comparison with the axillary buds of the in vitro plants and with the use of the culture medium containing 10.0 mg.l-1 of Pectimorf. Key works: Ipomoea batatas, micropropagation, oligogalacturonides