STUDI KOMPARASI KARAKTER MORFOLOGI DAN ISOZIM DUKU Lansium parasiticum (Osbeck) K.C. Sahni & Bennet ASAL KABUPATEN KUANTAN SINGINGI, RIAU

Duku ( Lansium parasiticum (Osbeck) K.C. Sahni & Bennet) from Kuantan Singingi Regency, Riau, known by local people as duku turak, has a unique oval betel nut-like neck, and tastes sweet similar to round duku. It has thick skin that is not easy to break, nor quickly rot. This duku was more preferred by local people than the round shaped duku known as duku gondok. However, the information about the potential of duku turak has not been known widely. The aim of this study was to compare morphology and isozyme characteristics of duku turak and gondok growing in Kuantan Singingi Regency based on morphological and isozyme characteristics. The result showed that turak and gondok can be distinguished based on morphological characteristics i.e tree, leave and fruit shape. Analysis of isozyme banding patterns used esterase isozyme which shows variation in the resulting patterns formed two bands. Acid phospatase (ACP) isozyme formed eight bands and aspartate aminotransferase (AAT) isozyme formed only one band. However, peroksidase isozyme showed no different variation in the resulting patterns. Similarity coefficient value based on morphology characters was about 0.15 – 0.74, while value of isozyme analysis was about 0.29 – 1.00 as well as the combination among morphology characters and isozyme were about 0.24 – 0.71. The results of this study provide characteristic information and taxonomic groupings that can be useful as a type improvement program that relies heavily on available genetic diversity