Shorea platyclados Slooten ex Endert is a commercial timber-producing tree from the Dipterocarpaceae family, with the trade name red meranti. The distribution and abundance of Shorea species in Indonesia are decreasing due to forest conversion and illegal logging. As a result, this species is listed as endangered (EN) according to The International Union for the Conservation of Nature (IUCN). Therefore, conservation efforts become an urgent task for this species. This study was conducted to identify the morphological characteristics and distribution patterns of S. platyclados in its natural habitat in the Martelu Purba nature reserve. Morphological identification was carried out through direct observation and measurement of all parts of the tree organs, such as the characters of leaves, seeds, flowers, stems, crowns, and bark. The species abundance was carried out through exploration and inventory methods in approximately 195 ha, and 110 plots were built for vegetation analysis. Our research found that S. platyclados has flat branches and has very sharp seed tips. The results of the species abundance showed that of 110 observation plots, 484 individuals of S. platyclados were found at the tree level. This condition is rather contrary to the current status registered by the IUCN.
Cold and freezing stress is one of the most harmful environmental stresses, especially in temperate and subtropical areas, that adversely affects plant growth, development, and yield production. Betula platyphylla Sukaczev, also known as white birch, is one of the most valuable, important, and widely distributed tree species in East Asia. This study explored the effects of cold acclimation (CA) in reducing the destructive effect of freezing stress in B. platyphylla seedlings. We measured the physiological and biochemical characteristics of B. platyphylla seedlings, such as chlorophyll content, electrolyte leakage (EL), malondialdehyde (MDA), antioxidant enzymes (such as superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT)), and proline content before and after freezing stress to observe the contribution of CA in reducing the detrimental effects of freezing stress. The results showed that CA increased physiological and biochemical characteristics of B. platyphylla seedlings before and after freezing stress, except for chlorophyll content. Antioxidant enzymes were significantly positively correlated with proline, MDA, and EL content, and negatively correlated with chlorophyll content. Moreover, histochemical detection (H2O2 and O2−) and cell death were revealed to be induced by cold stress in B. platyphylla seedlings. Furthermore, it was revealed that increased time and decreased temperature of the CA process significantly influenced the physiological and biochemical parameters. Overall, the CA process significantly reduced the detrimental effects of freezing stress compared to the control treatment in B. platyphylla seedlings. Taken together, these findings provide beneficial information toward understanding the mechanism of CA and freezing stress in B. platyphylla. Furthermore, the substantial activity of physiological and biochemical results could be used as selection criteria for screening time and temperature points of cold/freezing stress in further omics analyses. In addition, the combination of current study results, further omics analyses, and genetic engineering techniques directly contribute to sustainable forest management systems, tree plantations, and conservation of tree species, especially non-cold/non-freezing tolerant tree species.
Abstract. Rangkuti AB, Hartini KS, Susilowati A, Rambey R, Harahap MM, Arinah H, Irmayanti L, Pamoengkas P, Indriani F, Peniwidiyanti, Ruhidi A. 2023. Structure, composition and diversity of tree species in Martelu Purba Nature Reserve, North Sumatra, Indonesia. Biodiversitas 24: 78-85. Martelu Purba Nature Reserve is one of the conservation areas in North Sumatra that functions to protect biodiversity. However, there is limited information related to the vegetation community contained in the nature reserve. This study aimed to assess the diversity, structure and composition of tree species in the Martelu Purba Nature Reserve as well as to reveal the conservation status of the species in reserve. The research used the line transect method with a total of 112 observation plots representing various vegetation and environmental conditions. The results showed that there were 39 tree species belonging to 25 families, with 31, 25, 24, and 26 species at the tree, pole, sapling, and seedling stages, respectively. Shorea platyclados and Syzygium cerasiforme were species with the highest Important Value Index (IVI) at the tree and pole stages with 173.04% and 31.01%, respectively, while Gamblea malayana was the most important at the sapling and seedling stages with IVI of 66.43%, and 30.00%, respectively. The Shannon-Wiener diversity index (H') was categorized as low (1.58), the Margalef species richness index (DMg) was high at all growth stages, and the Evenness index (E) was high, indicating that all species were evenly distributed across the research plots. The distribution of tree diameter classes ranged from 20 - 40 cm for trees with the smallest diameter to 81-110 cm for trees with the largest diameter. Based on their conservation status, there were two species with conservation concerns, namely Coffea arabica (Endangered) and Lithocarpus maingayi (Vulnerable). The application of good silvicultural methods needs to be carried out in the context of conservation efforts. One example is through vegetative propagation of species with long flowering periods.
The purpose of this study was to determine the activity of Mau Sigaro farmer group in Gamsungi village and identified internal and external factors that became the strengths, weakness, opportunities, and threats of the honey bee cultivation business, in order to find a good strategy to develop it using SWOT matrix. The result of SWOT analysis showed the strength point was consisted of professional human resorces, received capital assistance, produced a pure honey, and short marketing channel. The weakness of this farmer group was limited opportunity for all the member to join some workshop related to honey bee cultivation, needed more capital assistance to pay the maintenance expense, the price of the product was cheap, using manual technic, and none market promotion. The opportunities identified as the support from the government to the farmer group and it had gained consumer trust towards the product. The threats was found as weather exchange, it had not used technology to gain information, and it still did not have a permanent marketing partner to distribute the product. Alternative stategy can be used to develope the honey bee business based on SWOT result is Mau Sigaro farmer group needs to gain more relation with the government and marketing partner, increase the number of production and the quality of the product, send the member to join honey bee cultivation workshop, using the newest technology in honey bee cultivation and mass communication to spread the product information, and using an attractive packaging to gain more consumers. Key words: honey bee cultivation, farmer group, developing strategy, SWOT
Abstract. Rambey R, Purba ER, Hartanto A, Prakoso BP, Peniwidiyanti, Irmayanti L, Purba MP. 2022. Short communication: Diversity and ethnobotany of Araceae in Namo Suro Baru Village, North Sumatra, Indonesia. Biodiversitas 23: 6006-6012. For Indonesian people, the variety of Araceae species has risen to prominence as an ornamental plant and a supplemental food source. However, there is still a lack of information about some species and their cultivation in some parts of North Sumatra. This research was conducted in the village of Namo Suro Baru, Biru-Biru District, Deli Serdang, North Sumatra to identify and study the ethnobotanical use of the species of Araceae. A total of 48 plots, each measuring 2 × 2 m were constructed, and 30 respondents from the community were interviewed about the local utilization of aroids. The results of vegetation analysis recorded a total of 17 species of Araceae plants in the village of Namo Suro Baru in Biru-Biru District, Deli Serdang Regency, North Sumatra Province. Xanthosoma sagittifolium was the dominant species with the highest IVI, i.e. 40.44%, while Dieffenbachia seguine had the lowest IVI (0.86%). The parts of the plant that the locals had traditionally used were the tuber, petiole, and whole leaf. The four main purposes of using Araceae plants were classified as foods, feeds, herbal formulations or medicines, and ornamental plants. Two species of corpse flowers, Amorphophallus titanum and A. prainii, also periodically bloomed in the village, but because they are protected species, the locals did not use them for their needs.
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