Iskandar Z Siregar

Iskandar Z Siregar
Bogor Agricultural University | IPB · Department of Silviculture

PhD

About

141
Publications
39,915
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985
Citations
Citations since 2016
99 Research Items
829 Citations
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
Introduction
Iskandar Z Siregar currently works at the Department of Silviculture, Bogor Agricultural University (IPB), Indonesia. He and co-workers conduct research in Forest Ecology, Silviculture, Agroforestry, Forest Genetics and Tree Breeding. Understanding complexity of ecosystem and using multi-, inter- and transdisciplinary approaches, he and the co-workers implement knowledge management cycle including stakeholder engagement to address the sustainability issues of natural resource management. Currently, he serves as Director, International Program IPB Bogor in which international research partnership is coordinated.
Additional affiliations
February 1990 - present
Bogor Agricultural University
Position
  • Faculty Member

Publications

Publications (141)
Article
Currently, gall rust is the most important disease of Falcataria moluccana in Indonesia. The gall rust pathogen was identified as Uromycladium falcatariae, in a recent study using molecular approaches. However, the molecular study of the F. moluccana gall rust pathogen from Indonesia has not been reported. Therefore, the study aimed to analyse this...
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Fabaceae is an invaluable plant family with considerable ecological and economic importances for example as food sources, bio-fertilizer, and medicinal plants. However, Fabaceae has been overexploited in Indonesia and several species belong to this family are critically endangered. Due to morphological similarity, rapid and accurate identification...
Article
Ebony (Diospyros celebica Bakh) is an endemic forest tree species found in Sulawesi whose basic information on its metabolite profile is still lacking. The objective of this research was to separate and identify putatively metabolite present in the leaves and wood of ebony across Sulawesi. Separation and identification of ebony metabolites were car...
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Given the difficulties for rapid biodiversity assessments in understudied regions, DNA barcoding appears as a suitable alternative. Still, this approach relies heavily on accurate reference sequence databases for correct taxonomic assignments. In this study, we evaluated the effectiveness of matK, rbcL, and ITS regions for the identification of Myr...
Article
Ultrafine bubbles and low doses of gamma irradiation had a positive effect on seed germination. This research tested the effectiveness of ultrafine bubbles (UFB) water and gamma irradiation for improving the viability and vigor of Albizia chinensis (Osbeck) Merr. seeds that had been stored for four years. A completely randomized two-factor experime...
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Tree diversity in Asia's tropical and subtropical forests is central to nature-based solutions. Species vulnerability to multiple threats, which affects the provision of ecosystem services, is poorly understood. We conducted a region-wide, spatially explicit vulnerability assessment (including overexploitation, fire, overgrazing, habitat conversion...
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Utilization of seeds storage results in decreased plant productivity. The increase can be used by treating seeds before planting through the technique of invigoration. This purpose of the study is to assess the effectiveness of invigoration methods using polyethylene glycol (PEG 6000) and ultrafine bubbles (UFB) to improve viability and vigor of se...
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Dryobalanops aromaticais a highly economic value resin-producing tree. The resin has been known as an essensialsinternational trade commodity that is widely used in the perfume, cosmetic, medicine, and other non wood industries. In its natural habitats, this species has been found to grow well onbothpeatland and mineral soilsthat has raised a quest...
Article
Initial evaluation of phenotypic variability and genetic diversity was conducted on the progeny test of 2 years-old sengon from Solomon provenance, which derived from nine families of mother tree and were then planted in 4 blocks in the Cirangsad Experimental Forest. Phenotypic assessment on eight traits was conducted on 36 trees using a scoring sy...
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Rain tree (Samanea saman) is a dominant species commonly planted as a shade tree in urban landscapes in the tropics, including in Indonesia. This species is also targeted for routine inspection and monitoring within tree management systems. Management should particularly focus on tree health through assessment of tree growth conditions as well as t...
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Shorea parvifolia (Dipterocarpaceae) is a widely distributed tree species which is important in terms of ecosystem functioning as well as forestry in Southeast Asia. During glacial periods, substantial precipitation decline is believed to have occurred in Southeast Asia, which considerably changed the distribution of the species. Repeated glacial a...
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Peatlands are especially important but fragile tropical landscapes. The importance of peatlands is owing to their ability to 1) sequester a considerable amount of terrestrial carbon, 2) store freshwater, and 3) regulate floods during the rainy season. Nowadays, extensive peatland degradation occurs because of peatland utilization for agriculture pu...
Data
Dyera costulata voucher SBDC 4 5.8S ribosomal RNA gene, partial sequence; internal transcribed spacer 2, complete sequence; and large subunit ribosomal RNA gene, partial sequence
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Kapur (Dryobalanops aromatica) is an important dipterocarp species currently classified as vulnerable by the IUCN Red List Threatened Species. Science-based conservation and restoration efforts are needed, which can be supported by new genomic data generated from new technologies, including MinION Oxford Nanopore Technology (ONT). ONT allows afford...
Article
Solar photovoltaics (PV) are on the rise even in areas of low solar insolation. However, in developing countries with limited capital, land scarcity, or with geographically isolated agrarian communities, large solar infrastructures are often impractical. In these cases, implementation of low-density PV over existing crops may be required to integra...
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Shorea is one of the largest genera of the Dipterocarpaceae family that dominates Indonesian forests. This genus has an essential role in meeting the supply of wood, both at home and abroad. There are 194 species of shorea in the tropics. However, there is a high degree of similarity between one species and another, making it difficult to identify...
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The objectives of this research are to test the initial viability and germination pattern of teak mistletoe seeds, namely Dendrophthoe pentandra and Macrosolen tetragonus in associated with parasitism. Research results showed that the pattern of D. pentandra germination was different from that of M. tetragonus . The germination process of D. pentan...
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Hyperdiverse tropical rainforests, such as the aseasonal forests in Southeast Asia, are supported by high annual rainfall. Its canopy is dominated by the species-rich tree family of Dipterocarpaceae (Asian dipterocarps), which has both ecological (e.g., supports flora and fauna) and economical (e.g., timber production) importance. Recent ecological...
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Mangifera casturi Kosterm., a mango plant from Kalimantan Selatan, Indonesia, has limited genetic information, severely limiting the research on its genetic variation and phylogeny. We collected M. casturi’s genomic information using next-generation sequencing, developed microsatellite markers and performed Sanger sequencing for DNA barcoding analy...
Article
The successful isolation of DNA (Deoxyribonucleic Acid) is essential for the investigation process of forestry molecular genetics. Samples used are usually retrieved either from soft or juvenile plant organs because of their excellent DNA source. However, in certain cases, aforesaid samples are hard to obtain, as for forensic purposes. Alternativel...
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The “ bunga bangkai ” is a compound interest with spadix and solitary inflorescences. Amorphophallus gigas is one of several species of Amorphophallus which is endemic to Sumatra. One of the original habitats for A. gigas is found in North Padang Lawas and is found in bloom almost all year round. This study aimed to observe the phenology of A. giga...
Preprint
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Background: Climate plays an important role in the growth process of various plant species, and the ebony species is no exception to this. Ebony (Diospyros celebica Bakh.) is a Sulawesi endemic flora species whose wood is widely used as a material for light to heavy construction and important raw material for Indonesia’s timber industry. Massive fo...
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Sengon (Falcataria moluccana (Miq.) Barneby & J. Grimes) is widely cultivated as a monoculture plantation in Indonesian community forests which posed a high risk of pest and disease attacks. Although plants can show signs of resistance, there is still a lack of investigation to explore growth variation due to environmental and genetic factors. This...
Article
The pin-penetration device is a minimally destructive instrument that is widely used to estimate the physical properties of wood, e.g., density, with advantages such as reduced testing times, low costs, and fewer defects induced in the wood being tested. In this study, such a device was used on 25 Indonesian hardwood species with a strength class (...
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At the oil palm landscape, conserving biodiversity and ecosystem processes can range from continuous adjacent forest remnant to tree patches (agroforestry) maintained within the oil palm landscape on steep slopes and riparian margins. The objective of the research was to analyze patched of tree planting inside monoculture oil palm plantation (agrof...
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Objectives Development of sequencing technology has opened up vast opportunities for tree genomic research in the tropics. One of the aforesaid technologies named ONT (Oxford Nanopore Technology) has attracted researchers in undertaking testings and experiments due to its affordability and accessibility. To the best of our knowledge, there has been...
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Rattan is a forest plant that has high economic and ecological value. This species grows in various habitats because of its good adaptability. Gunung Walat education forest (GWEF) is an ex-situ conservation location owned by IPB University and rattan conservation potential. In 2005 rattan were planted in this area from some material source in Indon...
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Ebony (Diospyros celebica Bakh.) is an endemic plant on Celebes (Sulawesi) island. Extractive compounds within ebony wood cause it to have durability, strength, and beautiful patterns. In this study, we used near-infrared (NIR) spectroscopy to discriminate between ebony wood samples, based on their origins at different growth sites on Celebes islan...
Article
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Objectives: Efforts to restore tropical peat swamp forests in Indonesia face huge challenges of potential failures due to socio-economic factors and ecological dynamics attributed to lack of knowledge on the adaptive mechanisms of potential tree species such as Kapur (Dryobalanops aromatica C.F.Gaertn Syn. Dryobalanops sumatrensis J.F. Gmelin A.J....
Article
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Sengon (Falcataria moluccana) plantations, particularly in Java, have been facing threats from gall-rust disease caused by the pathogen Uromycladium falcatariae, which has caused considerable economic losses. Other species with morphological similarities with F. moluccana raises the question of whether the infected and non-infected sengon are the s...
Article
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Forest tree enrichment can improve biodiversity and ecosystem functions. Tree enrichment planting in the riverside rehabilitation area of palm oil plantation needs to be monitored to prevent the risk of erosion and sedimentation. However, regular monitoring of enrichment planting is not yet optimally carried out including the benefits and identifie...
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Taman Margasatwa Ragunan (TMR) or Ragunan Zoo in Jakarta is the largest zoo in Indonesia. The zoo has around 52,700 trees that serve as part of the landscape and shades for animals and visitors. However, the presence of the trees in zoo also carries some risks, such as broken branches or even falling trees, that may threaten the safety of the anima...
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Siregar IZ, Muharam KF, Purwanto YA, Sudrajat DJ. 2020. Seed germination characteristics in different storage time of Gmelina arborea treated with ultrafine bubbles priming. Biodiversitas 21: 4558-4564. Gmelina (Gmelina arborea) seed collected from tropical Indonesian forest experience seed deterioration during storage which is relatively faster th...
Article
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Mistletoes are hemiparasitic macroparasite plants which interfere with trees and other wild plants in nutrient acquisition. As the plant has low leaf water potential, it draws water from teak wood tissues during the deciduous stage of the teak host, thereby killing the twigs and eventually, the teak tree. Mistletoes are also a key player in plant d...
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The peatland restoration program has been targeted by the Peatland Restoration Agency (BRG) of 2.4 million hectares from 2016 to 2020 including in Jambi Province. This program must be carried out collaboratively by involving various stakeholders (government, community, academic, NGO, and businessman). However, currently the clearing of peatland are...
Chapter
As populations in the developing countries grow, so does the demand for energy and food needed to sustain socioeconomic development and human welfare. This increasing demand exacerbates the competition for land between food production and electricity generation. Of particular concern are the developing countries with limited capital, land scarcity,...
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Ariawan I, Herdiyeni Y, Siregar IZ. 2020. Short Communication: Geometric morphometric analysis of leaves venation in Shorea spp. for identification using Digital Image Processing. Biodiversitas 21: 3303-3309. Shorea is one of the genera of the Dipterocarpaceae family which consists of more than 190 species. Massive exploitation of forests has threa...
Article
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Natural dye raw material is obtained from potential plants grown around the industry and then extracted by the industry itself. The uncertainty of the supply of natural dyes in the textile industry causes delayed fulfillment of consumer needs. The principle of sustainable production consists of economic, social and environmental aspects. The purpos...
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Productivity of forest plantation such as Eucalyptus pellita in Indonesia is strongly decreased by bacterial wilt disease (Ralstonia solanacearum Smith). However, studies of bacterial wilt disease on E. pellita in Indonesia is still inadequate, so several comprehensive research are required. This research was aimed to analyse the dominant silvicult...
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Rapid degradation of peatland forest in Indonesia is caused by conversion into plantation forest and agriculture land, including oil palm plantation by farmers. Restoration of peatland is then needed with involvement of local farmers as main stakeholder. This paper presents establishment process and initial result from an action research on peatlan...
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Several factors may compromise plant identifications provided by local informants, affecting the basis for incorporating local ecological knowledge (LEK) in scientific biodiversity assessments. Our study analyzes how site, informants’ background, and tree characteristics affect the consistency of folk identifications and the apparent correspondence...
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Anna N, Supriyanto, Karlinasari L, Sudrajat DJ, Siregar IZ. 2020. The growth, pilodyn penetration, and wood properties of 12 Neolamarckia cadamba provenances at 42 months old. Biodiversitas 21: 1091-1100. Jabon (Neolamarckia cadamba (Roxb) Bosser) is a potential tree species for the development of plantation forests and community forests to supply...
Article
Adzkia U, Nugroho N, Siregar IZ, Karlinasari L. 2020. Ultrastructure of royal palm (Roystonea regia) leaf sheath. Biodiversitas 21: 967-974. The royal palm (Roystonea regia (Kunth) F.Cook is one of the palm species that are many planted along the streets as part of urban landscapes. As biologically products, in nature they can self-cleaning with dr...
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Shorea balangeran Burk locally known as balangeran has widely use as transplant species for tropical peat swamp forest restoration, due to the capability of these species grow in waterlogged and dry area. However the information concerning genetic basis of adaptation to ecological condition variation is limited and no transcriptome study have been...
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The waste of synthetic dyes from the textile industry causes environmental problems, and it is categorized as hazardous wastes. In contrast, the use of natural dyes is reported to produce fewer pollutants. However, the use of mordant for improving the quality of the dyeing process may release hazardous pollutants because mordant that is commonly us...
Article
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The existence of Dryobalanops sumatrensis and D. oblongifolia subsp. oblongifolia in Indonesia’s natural forest is increasingly threatened due to land use changes and illegal logging leading to the urgent need of conservation actions in the field. Vegetative propagation by shoot cuttings has been proposed as an alternative method, yet there have be...
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Melia dubia Cavanilles (big mindi) is one of the fast-growing species which is potential to be developed in community forests. This species is found to occupy most agroforestry lands in Selaawi village (Garut, West Java). The research was conducted in three stand types, namely: (i) pine stand (as reference), (ii) old mindi stand, (iii) young mindi...
Article
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Melia Spp. is known as fast-growing tree species and commonly cultivated in community forest and agriculture land due to its valuable wood. This species was widely distributed in some agroforestry systems, especially in Selaawi village, Garut, West Java. Based on the farmer information, two species mindi were found in this location; they were small...
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DNA barcoding has been used as a universal tool for phylogenetic inferences and diversity assessments, especially in poorly studied species and regions. The aim of this study was to contrast morphological taxonomy and DNA barcoding, using the three frequently used markers matK, rbcL, and trnL-F, to assess the efficiency of DNA barcoding in the iden...
Article
Full-text available
DNA barcoding has been used as a universal tool for phylogenetic inferences and diversity assessments, especially in poorly studied species and regions. The aim of this study was to contrast morphological taxonomy and DNA barcoding, using the three frequently used markers matK, rbcL, and trnL-F, to assess the efficiency of DNA barcoding in the iden...
Article
Full-text available
Shorea is a genus of the Dipterocarpaceae family which shows high economic and ecological values. Currently, market demand for wood is still met from natural forests that are degrading due to over exploitation. The degraded forests are included in the rehabilitation program that require significant number of planting stocks, mainly from seedlings o...
Article
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Sengon (Falcataria moluccana), formerly known as Albizia falcataria or Paraserianthes falcataria, is an essential tree species for the development of community-based timber plantation, especially in Indonesia. The plantations nowadays are facing a significant disease threat, namely infection of gall-rust fungi (Uromycladium falcatarium). However, a...
Article
Full-text available
Chaerani N, Sudrajat DJ, Siregar IZ, Siregar UJ. 2019. Growth performance and wood quality of white jabon (Neolamarckia cadamba) progeny testing at Parung Panjang, Bogor, Indonesia. Biodiversitas 20: 2295-2301. The aim of this study was to evaluate the genetic parameters of growth and wood quality in white jabon progeny test at 54 months old in Par...
Article
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Sengon or Falcataria moluccana (Miq.) Barneby & J.W.Grimes is the main crop in community tree plantations in Java, Indonesia, favored because of its fast-growing property and the promising economic return. The wood itself is mostly used for light construction, furniture, plywood, packing materials, and recently as feedstock for bioenergy. Sometimes...
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ABSTRAK Tujuan penelitian ini ialah untuk menelaah peranan burung sebagai agen penyebaran benalu yang menginfeksi tegakan jati di Kebun Benih Klonal (KBK) Padangan. Rancangan penelitian berupa Petak Contoh Pengamatan (PCP) terdiri atas Petak Ukur Pengamatan (PUP-PUP) berukuran 50m x 50m sebanyak empat PUP dalam unit PCP dibedakan pada tingkat seran...
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Teak (Tectona grandis Linn. f.), one of the most-valued tree species in the world, is slow-growing with a long period until it can be harvested; therefore, ensuring that only high-quality seedlings or clones are selected for planting is critical. The main objective was to determine performance and repeatability of selected clones in terms of growth...
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Indriani F, Siregar U, Matra DD, Siregar IZ. 2019. Ecological aspects and genetic diversity of Shorea balangeran in two forest types of Muara Kendawang Nature Reserve, West Kalimantan, Indonesia. Biodiversitas 20: 482-488. Shorea balangeran (balangeran) belongs to the Dipterocarpaceae family that is distributed naturally in Indonesia with a wide ra...
Article
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The rapid conversion of Southeast Asian lowland rainforests into monocultures calls for the development of rapid methods for species identification to support ecological research and sustainable land‐use management. Here, we investigated the utilization of DNA barcodes for identifying flowering plants from Sumatra, Indonesia. A total of 1,207 matK...
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A study was conducted to determine the characteristics of exposed cavities on the trunk of urban trees in a Central Business District (CBD) landscape, South Jakarta. The position and number of exposed cavities, as well as the dimensions, were recorded. Each exposed cavity was then filled using a polyurethane foam, followed by wound dressing using c...
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Shading trees on the side of the road of the city or in the university campus areas can provide many benefits. Nowadays, people consider these trees as an important living component for improving the quality of built environment. However, these trees also can endanger the safety of the people around them if they are not well maintained. One of the...
Article
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Trees are an important biodiversity component in urban landscapes where their performances have to be monitored regularly in order to secure public safety as well as to avoid damages on humans and properties. Tree risk monitoring and assessment are conducted based on visual tree inspection as the principal method. However, in certain cases, the res...
Article
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Abstract. Occurrences of mistletoe infestations fluctuate depending on the environment and the biodiversity status, which includes anthropogenic factors. Recently, we have observed a potential hemiparasite in a teak clonal seed orchard located in Padangan, Central Java that caused a significant decrease in fruit (drupe) production. Almost one-third...