KERAGAMAN GENETIK MERBAU (Intsia bijuga O.Ktze) DAN IMPLIKASINYA BAGI PROGRAM PEMULIAAN
| Main Authors: | , MAHFUDZ,MP, , Prof. Dr. Mohammad Na'iem, M.Agr. |
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| Format: | Thesis NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2011
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/89359/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=51322 |
Daftar Isi:
- Tree improvement program plays important role in the plantation forest development of merbau.The success of tree improvement program among others, is determined by the genetic variation in resource population known as the basic population and information abaut genetic information is lacking. The research was conducted with objective to: (1) estimate the genetic diversity level of merbau, the genetic diversity within- and between populations, (2) estimate the rates of outcrossing in merbau, (3) estimate the genetic parameters assumed in plant growth in the field, and (4) determine the relationship between genetic diversity on isozyme level and growth. The research was divided into four stages involving: 1) the isozyme genetic diversity analysis and population s structure of merbau, 2) analysis on merbau mating system , 3) growth and genetic parameter of merbau, and 4) the relationship on isozyme genetic diversity and growth. The first, second, and fourth researches were conducted in the Laboratory of Plant Breeding, at the Faculty of Forestry, Gadjah Mada University for two months starting from 18 January 18 to 10 March 2010. The third experiment was carried out at the two sites of progeny testing, namely the Kawasan Hutan Penelitian Dengan Tujuan Khusus (KHDTK), Sobang, Banten Province, and at Bintuni, West Papua Province during 22 months starting from February 2008 to December 2009. The results showed the average percentage of polymorphic loci (PPL) was 96.40% and the average genetic diversity (He) was 0.409. Total genetic diversity of merbau was still quite higher as shown by HT = 0.438. The genetic variation was mostly distributed within the population, namely 93.38 and 6.62% was distributed among the populations. The phylogenetic relationship among populations was four groups. The higher level of genetic diversity, among other, was caused by intermating among merbaus with the higher average value of hybridization at multiple loci (tm = 1.00), and the average value of hybridization at one locus (ts = 0.994), respectively. The rate of kinship mating was very low among merbaus, i.e. 0.006. The higher genetic diversity in the natural populations strongly supported the adaptability an d growth of merbau in the field. Results of evaluations and observations on the 18 month merbau plants in the Sobang and Bintuni showed that the life average percentages of individual plant were 91.64% and 98.37%, respectively. The estimates of heritability both individual and familial heritability values of the analysis results in the Sobang, Bintuni plot progeny testing and the combination of both were in the range of moderate and high levels for all three parameters, i.e. height, diameter and branching. The heritability value can still change with time and plant growth. Hence, the heritability range of moderate and high level can be used as early information for selection in the future. The computation of genetic correlations between height and diameter in this research was robust in the Sobang (rg = 0.96) and Bintuni (rg = 0,92) progeny testing and in the combination of those two sites (rg = 0,95). Based on the origin of the merbau population, there was early information about the positive correlation between the genetic diversity and the growth of plant in terms of its height, diameter and branching characteristics were 0.12, 0.10, and 0.20, respectively.