Siregar IZ, Ramdhani MJ, Karlinasari L, Adzkia U, Arifin MZ, Dwiyanti FG. 2021. DNA Isolation Success Rates from Dried and Fresh Wood Samples of Selected 20 Tropical Wood Tree Species for Possible Consideration in Forensic Forestry. Science and Justice. https://doi.org/10.1016/j.scijus.2021.07.002 (Q1)
Karlinasari L, Noviyanti N, Purwanto YA, Majiidu M, Dwiyanti FG, Rafi M, Damayanti R, Harnelly E, Siregar IZ. 2021.Discrimination and Determination of Extractive Content of Ebony (Diospyros celebica Bakh.) from Celebes Island by Near-Infrared Spectroscopy. Forests 12(1):6. https://doi.org/10.3390/f12010006 (Q1)
Siregar, I.Z., Dwiyanti, F.G., Pratama, R. et al. Generating long-read sequences using Oxford Nanopore Technology from Diospyros celebica genomic DNA. 2021. BMC Research Notes 14, 75. https://doi.org/10.1186/s13104-021-05484-0 (Q2)
Siregar IZ, Dwiyanti FG, Siregar UJ, Matra DD. 2020. De novo assembly of transcriptome dataset from leaves of Dryobalanops aromatica (Syn. Dryobalanops sumatrensis) seedlings grown in two contrasting potting media. BMC Research Notes 13(1):401-405 (Q2)
Plantations of tropical species are becoming an increasingly important source of wood. However, it is important that research trials focus not only on tree growth performance, but also on wood quality. The aims of this study were to assess the growth performance of six commercially and ecologically important tree species from separate plantation trials in Indonesia and to determine the relationships between tree growth and wood quality in terms of the dynamic modulus of elasticity (MOE) and wood density. Forty-eight 7-year Maesopsis eminii Engl. and thirty-five 9-year specimens (7 each of 5 Shorea spp.) were selected from two trials. The MOE, based on acoustic velocity, was indirectly measured to evaluate wood stiffness. Tree-growth performance was evaluated, and correlations between growth traits and acoustic velocity as well as density and wood stiffness properties were estimated. The growth performance of M. eminii in terms of tree volume was significantly different in three different categories of growth (i.e. fast, medium, slow). Of the five Shorea spp. studied, Shorea leprosula Miq. had the highest growth rate, as expected since it is known to be a fast-growing Shorea species. Indirect measurement of wood quality by means of non-destructive ultrasonic methods showed a weak negative correlation between tree volume and acoustic velocity and dynamic MOE. Although each fast-growing tree could reach a merchantable size faster than other varieties or species, wood traits of various species tested were not significantly different based on tree growth rate performance. The findings from this study could be used to improve selection criteria in future breeding trials; indirect measurements of the dynamic modulus of elasticity can be used in mass pre-selection of genetic materials, to choose the most-promising material for in-depth evaluation.
Dynamic MOE, Non-destructive test, Selection criteria, Tree growth, Wood quality, Maesopsis eminii Shorea spp.
Karlinasari L, Andini S, Worabai D, Pamungkas P, Budi SW, Siregar IZ. 2017. Tree growth performance and estimation of wood quality in plantation trials for Maesopsis eminii and Shorea spp. J For Res: DOI:10.1007/s11676-017-0510-8
The study was carried out for investigation of the adaptability of white jabon seedlings from 12 populations to drought and water logging stresses in a controlled green house. The results showed that the adaptive responses of white jabon seedling to drought and waterlogging stress eswere affected by genotype (population). The drought and waterlogging stresses significantly inhibited plant growth, biomass accumulation and allocation, leaf area, also decreased chlorophyll content, increased carotenoids contents and accumulated free proline. Relative water content and specific leaf area tended to be higher in waterlogging and declined in drought stresses. The result clearly indicated that white jabon seedlings were more adaptive to waterlogging than to drought stresses. Moreover, there were different responses to drought and waterlogging stresses between the twelve populations. Kampar, Gowa, Kuala Kencana and OKI populations exhibited higher growth performance and stress tolerance index to be adapted to waterlogging stress, while Gowa, Pomalaa and Kampar population had relatively better growth performance in the drought stress.
Keywords: Anthocephalus cadamba, genotype, growth, population, stress tolerance index
Sudrajat DJ, Siregar IZ, Khumaida N, Siregar UJ, Mansur I. 2015. Adaptability of white jabon (Anthocephalus cadamba miq.) seedling from 12 populations to drought and waterlogging. AGRIVITA J. Agric. Sc. 37 (2): 130-143
Members of the mangrove genus Rhizophora represent the most commonly occurring and highly valued species in the Indo-West Pacific region. However, to date, few studies have been directed towards the understanding of their genetic variation. The levels and patterns of genetic variation at chloroplast and nuclear gene regions were studied in R. apiculata, R. mucronata, and R. stylosa sampled from Southeast Asia and Japan. All three species were characterized by low intraspecific genetic variation and a deficiency of heterozygotes in populations within the region, consistent with findings in studies on other mangrove species. Rhizophora mucronata and R. stylosa were also found to be more closely related than any of them with R. apiculata. During the Last Glacial Maximum, sea levels dropped to 120 m below the current levels, exposing part of the Sunda Shelf that became a barrier that limited gene flow between marine species living in the Pacific and Indian Oceans. Today, the Malay Peninsula is thought to still serve as a barrier to gene flow between populations occurring on its coasts. The pattern of genetic differentiation of R. apiculata supports the hypothesis of the land barrier effect of the Malay Peninsula, but such patterns were not found in R. mucronata and R. stylosa. Our findings suggest that R. apiculata, R. mucronata, and R. stylosa have different demographic histories despite being closely related and having sympatric distributions today. Furthermore, all three species appear to have high levels of inbreeding due to limited pollen and propagule dispersal, and that both these factors contributed to population differentiation.
Wei Lun Ng, Yoshitaka Onishi, Nobuyuki Inomata, Kosuke M. Teshima, Hung Tuck Chan, Shigeyuki Baba, Suchitra Changtragoon, Iskandar Z. Siregar, and Alfred E. Szmidt. 2015. Closely related and sympatric but not all the same; Genetic variation of Indo-West Pacific Rhizophora mangroves across the Malay Peninsula. Conservation Genetics 16 (1): 137-150
Dipterocarpus littoralis Blume is a critically endangered dipterocarp species found only in Nusakambangan Island, Central Java, Indonesia. Patterns of genetic diversity and population genetic structure of adults and saplings in two extant populations (Kali Jati and Solok Besek) were estimated using ten microsatellite markers. A total of 39 alleles were found, with two and four alleles being unique in adult and sapling populations, respectively. Allelic richness and heterozygosity were similar between adult (Ar = 3.00; He= 0.423) and sapling (Ar = 3.25; He= 0.441) populations. Inbreeding coefficients in saplings were positive in both populations and statistically significant in Kali Jati, while those in adult populations were not significantly different from zero, indicating excessive inbreeding and selfing in the sapling populations. Genetic differentiation of the sapling populations (FST= 0.036) was slightly lower than in the adult populations (0.050), but only significantly so for saplings. This study revealed that D. littoralis has low genetic diversity in both adults and saplings. Similarly low values in allele richness and heterozygosity suggest that reductions of population size have been ongoing for long periods in this species. Significant genetic differentiation between sapling populations but not adult populations indicates that recent fragmentation is further accelerating the isolation process.
Keywords: Dipterocarpus littoralis , microsatellite, genetic diversity, genetic differentiation
Dwiyati FG, Harada K, Siregar IZ, Kamiya K. 2014. Population genetics of the critically endangered species Dipterocarpus littoralis (bl.) Kurz (dipterocarpaceae) endemic on nusakambangan island, Indonesia. Biotropia 21(1): 1-12.
Higher education institutions in emerging regions of the world are increasingly expected (largely by their governments and community) to promote regional economic development and national competitiveness. This case study on one of the prominent academic universities in Indonesia – Bogor Agricultural University (Institut Pertanian Bogor, IPB) – highlights its successes and lessons learned in managing intellectual property as an entrepreneurial research-based university. This analysis of IPB provides general and specific insights for university administrators, researchers, and policy makers, especially in emerging economies, on appropriate strategies and measures in promoting synergies between research, entrepreneurialism and technology commercialization. The model provides strategies to maximize university research outputs, knowledge transfer and innovation to empower regional communities, and promote strategic and transformational partnerships, private sector engagement and economic growth opportunities for both the institution and the region.
Higher education, Public university, Research, Entrepreneurialism, Intellectual property, Innovation, Technology commercialization, Emerging economies, Indonesia
Payumo JP, Arasu P, Faizu AM, Siregar IZ, Noviana D (2014) An Entrepreneurial, Research-Based University Model for Economic Development in Emerging Economies: The Case of Bogor Agricultural University, Indonesia. World Patent Information 36: 22-31.
The book cover (http://www.springer.com; ISBN 9789400753372)
A book chapter, entitled “Incorporating Social and Natural Science in the Restoration of an Indonesian Conservation Forest: A Case Study from Jambi”
written by Ulfah J. Siregar, Iskandar Z. Siregar, S. Wilarso Budi, Y. Hero, D. Suharjito, and Hardjanto, Faculty of Forestry Bogor Agricultural University (IPB), Indonesia, is included in the recently published book by Springer with a title of A Goal-Oriented Approach to Forest Landscape Restoration
. The book was edited by Stanturf, John; Madsen, Palle; Lamb, David (Eds.) and will provide a valuable reference to graduate students and researchers interested in ecological restoration, forest ecology and management, as well as to professionals in environmental restoration, natural resource management, conservation, and environmental policy. You may see the following link
for details. (@izs)
A token of appreciation from OC (Mr.M Amrullah - Forum WACANA IPB)
Silvicultural aspects on post mining reclamatiom were discussed during the training conducted at SEAMEO BIOTROP, Bogor. As one of the resource persons, I presented a lecture on the obove mentioned subject that were attended by postgard students, mine officers and enviromental staff of mining companies. Numerous lessons learned and best practices on revegetation techniques were presented in particular interesting cases from gold, nickel and coal minings. Several innovations on bio-fertilizers from IPB were also exposed to the participants such as
Probio, Mycofer and B&O Fer
Visiting a research plot (rubber plantation) close to ex PT EMAL
JMB meeting of CRC990-EFForTS (Indonesa Consortium) was held at UNJA Campus Mendalo, Jambi. The meeting was officially opended by UNJA Rector, Prof. Aulia Tasman, and led by Speaker/Coordinator Indonesia, Prof. Anas M. Fauzi (Vice Rector for Reserach and Collaboration IPB). JMB meeting was attended by members from UNJA, UNTAD and IPB and Coordinator CRC990 Office (Bogor) from Univ Goettingen, Mr. Wolfram Lorenz. After the meeting the group left for Kabupatend Sarolangun to visit field plots in Landscape National Park Bukit Duabelas(TNBD) including a short visit to ex PT EMAL (@izs).