Tubérisationin vitro: Ullucus tuberosusetDioscorea

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Abstract
SummaryExplants consisting of a node of Ullucus tuberosus, Dioscorea balatas and D. japonica have been cultured in vitro. Tuberization has been induced in the cultures of Ullucus by placing them under short days (10 hrs.); tuberization did not occur under long days (16 hrs.). However, the addition of a cytokinin, benzyladenine, caused some tuber formation under long days.Bulbill formation on the explants of Dioscorea was enhanced by planting the. cuttings right-side-up (planting them in an invertsed position retarded their development), by using a mineral medium devoid of ammonium ions and by adding kinetin, another cytokinin.