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RISS 인기검색어
- 검색키워드
- 저자 : Dede J. Sudrajat (검색결과 3 건)
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Dede J. Sudrajat 한국산림과학회 2016 Forest Science And Technology Vol.12 No.1
Genetic variation patterns of white jabon (Anthocephalus cadamba [Roxb.] Miq.), were evaluated at the population level. Eleven natural populations were examined for variations in fruit, seed, and seedling morphophysiological characteristics. Analysis of variance revealed significant differences among populations for all the characteristics studied, except the radicle length. Genotypic variance and genotypic coefficient of variance for all fruit, seed, and seedling characteristics were found to be higher than corresponding environment variance and environment coefficient of variance, indicating that the genotype explained most of the variance for these characteristics. In particular, high heritability values coupled with high genetic gain were found for fruit weight, seedling height, root collar diameter, sturdiness index, leaf number, leaf length, and leaf width. Principal component analysis and hierarchical clustering of various characteristics of fruit, seed, and seedling revealed that most of the geographically distant populations are genetically close. Since these characteristics appear to be under strong genetic control, considerable scope exists for exploitation of heritable additive genetic components for future breeding and improvement in white jabon.
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Effect of initial morphology on field performance in white jabon seedlings at Bogor, Indonesia
Budi Budiman,Dede J. Sudrajat,이돈구,김용식 한국산림과학회 2015 Forest Science And Technology Vol.11 No.4
Reforestation programs should be supported by adequate forest nursery techniques. Seedlings used for reforestation programs in Indonesia were based on the height of seedlings ready to be planted in the field without basic knowledge of seedling morphology. White jabon (Anthocephalus cadamba [Roxb.] Miq.), a potentially fast-growing multipurpose tree species, has been extensively planted for land rehabilitation and reforestation programs. The objective of this study was to determine the influence of seed viability and initial morphology (diameter and height classes) of A. cadamba seedlings on field survival and growth after planting at Parungpanjang Research Station, Bogor, Indonesia. Correlations were found between seedling characteristics at initial stages and survival or growth in the field: seed viability and seedling height; seedling diameter or survival rate in the field; and seedling height growth in both the nursery and field. Thus, more viable seeds may predict better seedling height growth, seedling diameter growth, and higher survival in the field after planting. The morphology class of H2D4 (height 20< 30 cm, diameter > 4.5 mm) was a good diameter and height class because of good sturdiness quotient of 5.47 and also high total dry weight of 3.05 g.
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Naning Yuniarti,Yulianti,Dede J. Sudrajat,Nurhasybi,Muhammad Zanzibar,Dida Syamsuwida,Nina Mindawati,Ahmad Junaedi,Kurniawati Purwaka Putri,Evayusvita Rustam,Nurin Widyani,Yosephin Martha 한국산림과학회 2023 Forest Science And Technology Vol.19 No.3
Red jabon (Neolamarckia macrophylla) is one of potential tree species, but there are some problems in its cultivation. Intermediate seed character and very small seed sizes with little food reserves often cause the low germination, low growth of the seedlings, and the sowing of the seeds to be too dense, resulting in an abnormal number of seedlings. The purpose of the research was to improve the seed germination and seedling quality of red jabon by adjusting the sowing density and seed invigoration treatment using hormonal and bioprim- ing. Two experiments were conducted, that is, (1) identification of optimal seed density on the several combinations of sowing media (top soil, rice husk and compost) and (2) evalu- ation of the most suitable hormonal priming (GA3) and biopriming (liquid organic fertilizer, LOF) applications. The use of top soil media with a seed density of 0.5 g/400 cm2 can pro- duce the highest pure live seed (PLS), that is, 721.67 seedlings/0.5 g. The seed treated by hormonal and bio-priming significantly affected the seed germination and seedling growth. Soaking seed in GA3 100 ppm for 4 days produced the highest of the PLS (764 seedling- s/0.5 g), followed by soaking in LOF for 3 days and GA3 50 ppm for 4 days. The highest seed- ling height was generated from soaking the seeds using LOF for 3 days. The highest root collar diameter and biomass of red jabon seedlings were obtained from the treatment of seeds immersed in the GA3 50 ppm for 3 days. The best quality index value of red jabon seedlings was produced from the treatment of seeds immersed in the hormone GA3 50 ppm for 3 days. In general, a sowing density of 0.5 g/400 cm2 in top soil media and seed soaking treatment in GA3 50 ppm or LOF for 3 days can improve germination and growth of red jabon seedlings.
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