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).
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.
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