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Efficient procedure for grapevine embryogenic suspension establishment and plant regeneration: role of conditioned
A Ben Amar1, P Cobanov, K Boonrod
1Laboratoire de Physiologie Moléculaire de la Vigne, Technopôle de Borj Cédria, BP 95, Hammam-Lif 2050, Tunisia.
Abstract:
An efficient system for the establishment and multiplication of highly prolific embryogenic cell cultures of grapevine (Vitis sp.) was developed. Using anther-derived pro-embryogenic masses as starting material, cell suspensions of different grapevine cultivars (Tempranillo, Cabernet-Sauvignon) and rootstocks (Kober 125 AA, Kober 5 BB, 110 Richter) were initiated in liquid medium containing NOA (1.0 mg l(-1)) and BAP (0.25 mg l(-1)) as growth regulators. Conditioned medium was recovered and utilised for establishing new, highly totipotent cell cultures. The suspensions obtained, showed embryogenic competence resulting in somatic embryo induction and subsequent plant regeneration. In this study, a simplified establishment procedure for grapevine embryogenic cell suspension allowing the fast multiplication of embryogenic material is described. Evidence for the promoting effect of the protein fraction derived from conditioned medium, on cell proliferation was found. In bioassays, addition of ss-D: -GlcY affect cell proliferation suggesting that arabinogalactan proteins are required for growth processes in grapevine cell cultures.
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