EFFECT OF SELECTION ON GENETIC GAIN OF FIRST GENERATION SEEDLING SEED ORCHARD OF JABON MERAH (Anthocephalus macrophyllus Roxb. Havil.) ESTABLISHED IN WONOGIRI
| Main Authors: | Surip, Surip, Indrioko, Sapto, Nirsatmanto, Arif, Setyaji, Teguh |
|---|---|
| Format: | Article info application/pdf eJournal |
| Bahasa: | eng |
| Terbitan: |
Center for Forest Biotechnology and Tree Improvement (CFBTI)
, 2017
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| Subjects: | |
| Online Access: |
http://ejournal.forda-mof.org/ejournal-litbang/index.php/JPTH/article/view/3015 http://ejournal.forda-mof.org/ejournal-litbang/index.php/JPTH/article/view/3015/3681 |
Daftar Isi:
- Selection is a fundamental process in the establishment of a progeny trial that will be converted into a seedling seed orchard. In present study, selection practiced in first-generation progeny trial of jabon merah (Anthocephalus macrophyllus Roxb. Havil.) was observed. The study was aimed to find out a criteria selection accompanied with the effective coefficient weight for predicting genetic gain in the first-generation progeny trial of jabon merah. The trial was established in Wonogiri which was laid out in randomized complete block design (RCBD) using 55 families, 4 replications, 4 tree-plot with a spacing of 4 x 2 meter. Measurement was conducted at 40 months after planting covering tree height, diameter at breast height, stem straightness, stem volume. First within-plot selection by culling 2 poorer trees within each plot was practiced at 46 months age. Selection differential from within-plot selection was used to derive coefficient weight which was then applied to predict genetic gain. Results of study showed that selection differential from first within-plot selection were positive for all measured traits. Stem volume was observed as highest priority trait with coefficient weight for each trait were -0.0863 (height), 0.1426 (diameter), 0.2195 (stem straightness), 2.3025 (stem volume). Prediction of genetic gain from within-plot selection were 3,50% (height), 3.58% (diamater), 3.41% (stem straightness), 7.40% (stem volume). While the gain from family selection were 2.80%, 3.75%, 3.54%, 7.10% for height, diamater, stem straightness, stem volume, respectively.