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Endosperm as a result of double fertilization in Angiospermae shows high level chromosomes and polyploidy. It is also considered as dead tissue that unable to be generated to form plantlet. The aim of this research is to determine the effect of kinetin and 2,4-Dichlorophenoxyacetic acid (2,4-D) in induction of callus formation of mountain papaya. This research used A factorial randomized block design with 18 groups, 1 fruit was used for 1 experimental group. Culture using Murashige and Skog (MS) media with combination of three level of kinetin (0, 2, 4 mgL -1 ) and six level of 2,4-D (0, 1, 2, 3, 4, 5 mgL -1 ). Maximum endosperm callus induction (0.88%) was achieved from endosperm explant cultured on MS medium fortified with 2.0 mgL -1  Kinetin and 4.0 mgL -1  2,4-D. The fastest day induction (24,66 day) was observed with 5.0 mg L -1  2,4-D. The maximum number of browning (0,10) was induced by 2.0 mgL -1  Kinetin and 5.0 mgL -1  2,4-D. Combination Kinetin and 2,4-D proved could induces callus formation from mountain papaya endosperm.

Callus induction of mountain papaya endosperm (Vasconcellea pubescens A. DC) with different combination of 2,4-Dichlorophenoxyacetic acid and Kinetin