摘要：The aims of the research was tostudy the variation of morphology, the band pattern of isozyme, and vitamin Ccontent of dragon fruit (Hylocereus spp.) varieties such as super red, red and whitefrom Pasuruan (East Java), Sukoharjo and Klaten (Central Java), and Bantul districts(Yogyakarta). Morphological character were carried include fruit, stem, and flowersof each variety of dragon fruit. The isozymic pattern was analyzed using NTSYS2.02i. The data matrix was counted based on the DICE coefficient. The clustering wasdone by applying UPGMA which counted through SHAN. Vitamin C contentmeasured by titration method then analyzed descriptively. The results showed thatthe higher vitamin C content was found from super red of Pasuruan (6.00) and thenfollowed by red color (5.376) and super red (5.113) both from Bantul. Themorphological variation on the stem and petal colors, and fruits were also shown bythe isozymic data of three varieties of dragon fruits collected from four separatedlocations. Esterase (EST) showed 18 bands and forming four (4) groups based on 75%genetic similarity index. The specific band occurred on Rf 0.633 of red varieties ofdragon fruit from Bantul and on Rf 0.755 from Pasuruan. The specific band alsooccurs on Rf 0.347 of white variety from Bantul and on Rf 0.510 and on Rf 0.633 fromKlaten. Glutamic oxaloacetic transaminase (GOT) enzyme shows 12 bands and alsoforming four groups with a little difference for member in the fourth group. Thespecific band occurs on Rf 0.321 of red color fruit from Pasuruan. The specific bandalso occurs on the white from Pasuruan on Rf 0.446 and on Rf 0.482. The variation ofdragon fruits were also supported by isozymic data indicated that the morphologicalcharacter were in accordance with the genetics data
关键词：dragon fruit; Hylocereus; morphology; isozyme; vitamin C.
