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High demand of kayu kuku (Pericopsis mooniana Thw) has threatened the existence of its populations in natural distribution. Therefore, ex-situ conservation need to be carried out to protect them from extinction. Preparation genetic materials in nursery stage is very important to support the success of establishing ex-situ conservation plot. The objective of this research is to observe the role of genetic factor in the growth characteristics of kayu kuku seedlings in which the seed was originally collected from South East Sulawesi provenance. This research was arranged in Completely Randomized Complete Bock Design with 40 families in three replications. The result showed that genetic difference among the tested families affected the growth characteristics of seedling for height, diameter and sturdiness index. Genotype and phenotype correlation between height and diameter traits were 0.95 and 0.74 respectively. It revealed that high genetic diversity of kayu kuku could be observed in seedling stage, and indicated an important of genetic materials collected from Southeast Sulawesi provenance for further conservation and tree improvement program.

Anthocepalus cadamba (white jabon) has high economical value for furniture. White jabon forests severely degraded due to intensive exploitation and land conversion. Genetic diversity is one of important consideration to design conservation and improvement strategies. Aim of this study was to access the genetic diversity values within and among population of white jabon. Leaf samples of white jabon were collected from conservation plots originated from West Lombok, Sumbawa, South Sumatera and West Sumatera. Red jabon was included as an outgroup population. Based on 37 polymorphic RAPD loci, the results showed comparable value of genetic diversity between white jabon and red jabon. Number of detected and rare alleles was highest founded in Sumbawa population among the other three populations of white jabon. As consequence, value of expected heterozygosity in the population was highest (HE=0.315). Private allele was only detected in South Sumatera population. Principal coordinate analysis (PCA) showed that integrating between genetic and geographical distance was inconsistent; similar gene resources or human impact might be responsible for this result. The populations that have high value of genetic diversity and private allele are recommended to be selected for the conservation strategies, i.e. Sumbawa and South Sumatera.

Growth is one of important and economic traits of jabon. Growth is not only determined by environment but also genetic factor. Seedling quality and suitable site would create well growing plants. This research is purposed to know growth characteristic of jabon from Sumbawa provenances in nursery and after plantation as well as the effect of genetic factor on growth characteristic of jabon. Research design used in nursery is Completely Randomized Design with 24 mother trees and 3 replications. Each replication comprises 10 seedlings. Totally, there are 720 seedlings. Experimental design used in progeny test plot of jabon is Randomized Complete Block Design. Breeding strategy used in this plot was subline system with single treeplot. Number of families used are 28 families. Each family comprises 20 blocks that were also functioned as replication. The results showed that there were significant differences in terms of height and diameter among the tested families at all observation ages. Family heritability estimates for height were high at at all observation ages. Family heritability estimates for diameter were high at nursery and moderate after plantation.

Jabon merupakan jenis tanaman cepat tumbuh yang prospek pemasarannya cukup tinggi. Pemanfaatan kayu dan teknik silvikulturnya sudah dikenal luas oleh masyarakat. Tujuan dari penelitian ini adalah untuk mengetahui relasi variasi genetik terhadap karakteristik bibit jabon dari berbagai pohon induk dari provenan Ogan Ilir (Sumatera Selatan) dan Lombok Barat (Nusa Tenggara Barat) pada tingkat semai. Rancangan yang digunakan yaitu Rancangan Acak Lengkap dengan 20 pohon induk, dengan 3 ulangan, tiap ulangan terdiri dari 10 bibit sehingga jumlah bibit yang digunakan sebanyak 600 bibit. Hasil penelitian menunjukkan bahwa terdapat variasi genetik yang memberikan pengaruh terhadap sifat tanaman yang diamati. Hal ini ditunjukkan dengan keragaman genetik dari karakter atau sifat pertumbuhan tinggi, diameter dan indeks kekokohan semai antar famili di dalam provenan jabon. Sifat pertumbuhan diameter antar provenan tidak menunjukkan variasi yang nyata. Sedangkan variasi genetik untuk sifat tinggi dan indeks kekokohan semai antar provenan menunjukkan perbedaan yang signifikan. Bibit yang memiliki sifat pertumbuhan tinggi dan kekokohan semai terbaik berasal dari famili 18 (Ogan Ilir). Bibit yang menunjukkan sifat pertumbuhan diameter terbaik berasal dari famili 10 (Lombok Barat).

The objectives of this study were to investigate the level of genetic variation and to describe its distribution within and among populations of merbau. Leaves of wildling were collected from four populations distributed in Papua and Moluccas islands. Genetic variation was detected by isoenzyme markers using four enzyme system i.e. Peraxidae (POD), Esterase (EST), Diaphorase (DIA) and Glutamate Oxaloacetate Transaminase (GOT). The result showed that 17 alleles were identified and distributed on 6 polymorphic loci. The mean percentage of polymorphic loci was 95.8 %. The average genetic diversity within population was 0.049. The UPGMA cluster analysis based on Nei’s standard genetic distance reflected three clusters, i.e. Haltim and Waigo formed first cluster, Nabire formed second cluster, and Seram formed third cluster separated from two other clusters.