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All Journal HAYATI Journal of Biosciences Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Jurnal Fitopatologi Indonesia Jurnal Ilmu Pertanian Jurnal Natur Indonesia Jurnal Ilmu Pertanian KULTIVAR AGROEKOTEKNOLOGI JURNAL ILMU PERTANIAN Kultivasi SAINS TANAH - Journal of Soil Science and Agroclimatology Jurnal Biolokus: Jurnal Penelitian Pendidikan Biologi dan Biologi jurnal Ilmu Pertanian (Agricultural Science) International Journal of Basic and Applied Science PERTANIAN TROPIK Makara Journal of Science

Luthfi Aziz Mahmud Siregar

Universitas Sumatera Utara

Author-ID : 310019

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Medicine & Pharmacology Physics

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Potensi Dark Septate Endophyte Isolat Sumatera Utara terhadap Ganoderma boninense Penyebab Busuk Pangkal Batang Kelapa Sawit: Potential of Dark Septate Endophytes North Sumatra Isolates Against Ganoderma boninense the Pathogen of Basal Stem Rot of Oil Palm Firdani, Citra; Lisnawita; Siregar, Luthfi Aziz Mahmud
Jurnal Fitopatologi Indonesia Vol. 20 No. 3 (2024): Mei 2024
Publisher : The Indonesian Phytopathological Society (Perhimpunan Fitopatologi Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14692/jfi.20.3.154-164

Penyakit busuk pangkal batang yang disebabkan oleh Ganoderma boninense menyebabkan kerusakan signifikan pada perkebunan kelapa sawit di Asia Tenggara, termasuk di Indonesia. Penggunaan fungisida kimia yang intensif terhadap Ganoderma dapat berdampak negatif terhadap lingkungan, kesehatan, dan terganggunya keseimbangan ekologi. Aplikasi mikrob sebagai agens hayati menggunakan cendawan endofit antagonis, salah satunya dark septate endophyte (DSE) berpotensi sebagai pengendalian Ganoderma. Penelitian ini bertujuan mendapatkan isolat DSE lokal Sumatera Utara dari areal endemik Ganoderma yang berpotensi untuk mengendalikan G. boninense. Eksplorasi cendawan DSE dilakukan pada areal dengan insidensi Ganoderma moderat (5%-30%) di Kecamatan Galang, Kabupaten Deli Serdang dan pengujian dilakukan secara in vitro. Hasil penelitian didapat lima isolat cendawan DSE, yaitu isolat II 3 A CM, Gelap A, II 4 CM, II 3 A CC, dan abu-abu. Kemampuan daya hambat terhadap perkembangan G. boninense secara in vitro dari yang paling tinggi berturut-turut adalah isolat Gelap A (100%), abu-abu (90.87%), II 3 A CC (82.83%), II 3 A CM (82.23%), dan II 4 CM (74.88%) pada 7 hari setelah inokulasi. Temuan ini merupakan data awal akan potensi cendawan DSE sebagai agens hayati G. boninense dan merupakan laporan pertama untuk cendawan DSE asal tanaman kelapa sawit di Sumatera Utara.

In vitro The Role of Paclobutrazol in Potato Seed Production (Solanum tuberosum L) cultivar Granola Kembang Early Generation (G0) In Vitro: Potato Purba, Hans Samuel; Hot Setiado; Siregar, Luthfi A. M.
Jurnal Online Pertanian Tropik Vol. 8 No. 1 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

The aim of the research was to determine the best paclobutrazol treatment to obtain superior quality seed potato cultivars. The research was conducted at the Tissue Culture Laboratory of Horticulture Technical Centre Service Unit, Gedung Johor, Medan, North Sumatra, Indonesia from January 2020 to March 2020. The complete randomized design with a single factor, 4 treatments, and 6 replications was used in this research. The results showed that the concentration of paclobutrazol affected the number of leaves, the shoots length, the number of shots, the number of nodes, the number of internodes, the stem diameter, and the percentage of roots formed but not significantly affected the number of roots. The M2 treatment, MS + 9 ppm paclobutrazol, showed the best treatment with an average plantlet performance value of 7.33 and the plantlets showed the compact morphology with larger stem diameter and smaller thick dark green leaves.

Microbial phosphate solubilization mechanisms in P solubilizing in andisol Marpaung, Agustina Erlinda; Sabrina, Tengku; Rauf, Abdul; Susilowati, Dwi Ningsih; Siregar, Luthfi Aziz Mahmud
Kultivasi Vol 23, No 2 (2024): Jurnal Kultivasi
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/kultivasi.v23i2.52749

Phosphate (P) nutrient plays a significant role in plant growth and yield. P is an essential element that plays an important role in photosynthesis and root development. Phosphate nutrient availability is deficient in some soil types due to retention, such as in Andisol soil types. High phosphate retention in Andisol soil types causes P nutrients to be unavailable to plants and can reduce crop yields. The availability of P in Andisol soils can be done, among others, by applying phosphate solubilizing microbes. Phosphate solubilizing microorganisms are soil microorganisms consisting of bacteria and fungi that can mineralize organic P, dissolve inorganic P minerals, and store large amounts of P to make it available to plants. This literature review aims to determine the mechanism of phosphate-solubilizing microbes in P dissolution in Andisol soil. The methods used in this systematic review are collecting data through the internet and utilizing recognized sources such as Science Direct, Research Gate, Google Scholar, and Web of Science. Content analysis was performed on the collected data, and the results were organized into thematic categories. Furthermore, the findings are presented descriptively with the help of tables to facilitate understanding. Since phosphate-solubilizing microorganisms can dissolve P in the soil through chemical and biological mechanisms, it can be concluded that phosphate-solubilizing microorganisms also have an important role in the soil P cycle. The implications of this literature review are to understand the retention of P nutrients in Andisols and how the dissolution mechanism works, as well as the use of microbes as a solution to increase phosphate dissolution so that it is available to plants.

Pengaruh Pemberian Asam Salisilat terhadap Tanaman Kacang Merah Lokal (Phaseolus vulgaris L.) di Dataran Menengah Ermando, Relly; Siregar, Luthfi Aziz Mahmud; Ginting, Jonatan
AGRIUM: Jurnal Ilmu Pertanian Vol 28, No 2 (2025)
Publisher : UNIVERSITAS MUHAMMADIYAH SUMATERA UTARA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/agrium.v28i2.22511

Kacang merah adalah sumber protein nabati yang penting di Indonesia, kaya akan nutrisi seperti protein, karbohidrat kompleks, serat, vitamin, dan mineral. Penanaman kacang merah di dataran menengah, terutama di Sumatera Utara, bertujuan untuk meningkatkan ketahanan pangan dan efisiensi dalam rangka ekstensifikasi lahan. Penelitian bertujuan untuk mengkaji pengaruh berbagai kultivar kacang merah lokal (Phaseolus vulgaris L.) asal Simalungun dan aplikasi asam salisilat terhadap tanaman kacang merah di dataran menengah. Penelitian dilaksanakan di Desa Rumah Galuh, Kecamatan Sei Bingai, Kabupaten Langkat, menggunakan Rancangan Acak Kelompok (RAK) faktorial dengan dua faktor, yaitu 9 kultivar kacang merah lokal dan 3 konsentrasi asam salisilat (kontrol, 100 ppm, dan 200 ppm). Hasil penelitian menunjukkan kultivar Siantar Narumonda (TE1) memiliki hasil terbaik dan berpengaruh nyata pada tinggi tanaman. Pengaplikasian asam salisilat dengan konsentrasi 200 ppm memberikan pengaruh yang signifikan terhadap bobot basah, dan bobot kering tanaman. Asam salisilat terbukti mampu meningkatkan aktivitas fisiologis tanaman, seperti fotosintesis dan metabolisme, yang mendukung peningkatan produksi kacang merah. Interaksi antara kultivar dan aplikasi asam salisilat memberikan pengaruh signifikan pada tinggi tanaman, namun tidak memberikan pengaruh yang signifikan terhadap parameter lainnya.

Growth and biochemical responses of red chili (Capsicum annuum L) under drought conditions with 6-Benzylaminopurine application Sihotang, Tambun; Siregar, Luthfi Aziz Mahmud; Rahmawati, Nini
International Journal of Basic and Applied Science Vol. 13 No. 2 (2024): Sep: Basic and Applied Science
Publisher : Institute of Computer Science (IOCS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35335/ijobas.v13i2.404

The purpose of this research is to assess how red chili plants (Capsicum annuum L.) develop and react biochemically to drought stress, as well as how cytokinin treatment affects these plants. The study employed a factorial Randomized Block Design (RAK) with three replications and two components, namely the degree of drought with three stages, comprising: K1 has an 80% soil water content, K2 has a 60% soil water content, K3 has a 40% soil water content, and S0, S1, S2, and S3 have 0 ppm, 10 ppm, 20 ppm, and 30 ppm of 6-benzylaminopurine concentration, respectively. Plant height, leaf count, root length, flowering age, total and aqueous chlorophyll content, activity of antioxidant enzymes (e.g., superoxide dismutase and peroxide dismutase), and hydrogen peroxide as a signal for plant molecules against dehydration stress are among the parameters assessed. The findings demonstrated that red chili plants under drought stress experienced slower growth, as seen by a reduction in height and leaf count as well as earlier flowering. However, by raising plant height, leaf count, and chlorophyll levels (a, b, and total), cytokinin treatment was able to lessen the deleterious impacts of drought. When treated with 10 ppm 6-Benzylaminopurine, the enzyme activity of superoxide dismutase, peroxide dismutase, and hydrogen peroxide increased, but at other dosages, it tended to decrease, suggesting a slight but noticeable increase in plant defense mechanisms against oxidative stress. Therefore, giving red chili plants 10 parts per million of cytokinin may be a useful tactic for enhancing their resistance to drought stress.

Immersion in 6-Benzylaminopurine for Dormancy Release and Initiation of Potato Sprouts at Various Tuber Weight and Storage Duration Siregar, Luthfi Aziz Mahmud; Lambok Turnip; I.M. Revandi Damanik
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 49 No. 1 (2021): Jurnal Agronomi Indonesia
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

One of the main obstacles in providing quality potato seed tubers is the long dormancy period of the potato seeds. A study that explores this has been carried out to elucidate the response of dormancy release and initiation of potato sprouts to the differences in tuber weight and storage duration before immersion in cytokinin (6-benzylaminopurine). The study was conducted at the seed warehouse UPT Horticulture Parent Seed Kutagadung Berastagi, Department of Food and Horticulture of North Sumatra Province, from November 2018 to January 2019. The research was carried out with a factorial completely randomized design with two factors, namely (i) tuber weight, consisting of 4 levels [25-35 g, 55-65 g, 85-95g, and 115-125 g]; and (ii) tuber storage duration before immersion in 6-benzylaminopurine (BAP) solution, consisting of 5 levels [control (without immersion), 1, 15, 30, and 45 days after harvest]. Tuber weight, storage duration before immersion, and the interaction of the two factors showed significant effects in dormancy breaking time, germination percentage, germination rate, number of sprouts, and length of sprouts. The number and length of the sprouts increased with the increasing tuber weight and storage duration before immersion in BAP. Keywords: cytokinin, germination, Solanum tuberosum L., tuber seeds

Functional diversity of bacteria in various saline soil plant vegetations around Sialang Buah Coast, North Sumatra, Indonesia Mariani Sembiring; Juli M. Hutahuruk; Dwi Ningsih Susilowati; Erny Yuniarti; T. Sabrina; Luthfi A. Mahmud Siregar
SAINS TANAH - Journal of Soil Science and Agroclimatology Vol 21, No 2 (2024): December
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/stjssa.v21i2.80075

Environmental conditions profoundly influence microbial diversity and activity in soil. For optimal growth, soil microbes face limiting factors such as temperature, moisture, pH, and salinity levels. This study aims to find types of functional bacteria that are able to live in saline soils. The study was conducted in the Soil Biology Laboratory at Universitas Sumatera Utara (USU), Indonesia. Soil samples were collected around the Sialang Buah Coast, Serdang Bedagai Regency, North Sumatra, Indonesia. The method employed in this research was random composite sampling taken from three vegetation types: mangrove forests, grasslands, and oil palm plantations, with sample collection locations influenced by tidal fluctuations. Ten sampling points were taken at each location and then composited for each vegetation type. The results of the study showed that there were ten species of bacteria that were able to live in saline soil, namely Pseudomonas aeruginosa, Burkholderia gladioli, Enterobacter cloacae, Brucella ciceri, Ochrobactrum oryzae, Achromobacter xylosoxidans, Priestia flexa, Enterobacter quasiroggenkampii, Bacillus cereus and Ochrobactrum oryzae. All bacteria found were able to grow on Pikovskaya, Alexandrov, and Jensen media and only seven species of bacteria were able to form biofilms, namely P. aeruginosa, B. gladioli, E. cloacae, B. ciceri, A. xylosoxidans, P. flexa, and E. quasiroggenkampii

Diversity of orchids in Taman Eden 100, Lumban Julu District, Toba Regency, North Sumatra, Indonesia Arif Syahrizal; Luthfi Aziz Mahmud Siregar; Diana Sofia Hanafiah; Nurhasnah Manurung; Mohammad Nasrul Hakim Roslan
Jurnal Biolokus : Jurnal Penelitian Pendidikan Biologi dan Biologi Vol 9, No 1 (2026): June
Publisher : Universitas Islam Negeri Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30821/biolokus.v9i1.5305

Orchid diversity in tropical forest ecosystems is increasingly threatened by habitat degradation and land-use change, highlighting the importance of biodiversity assessments in conservation areas. This study aimed to determine orchid species composition, species diversity, and the physical environmental conditions supporting orchid habitats in Taman Eden 100, North Sumatra, Indonesia. The research was conducted from August to October 2023 using a descriptive–exploratory approach with purposive sampling. Five plots measuring 20 × 20 m were established in representative orchid habitats. Data were analyzed descriptively using relative density, relative frequency, relative dominance, the Important Value Index (INP), and the Shannon–Wiener diversity index. A total of 77 orchid species were recorded, comprising 51 epiphytic species (66%) and 26 terrestrial species (34%). Thelasis micrantha was the most abundant species, with 178 species and the highest INP (12.99%), whereas Bulbophyllum odoratum was the least abundant species, represented by a single species with an INP of 0.22%. The orchid habitats were characterized by air temperatures of 21-27°C, relative humidity of 94-97%, soil pH of 6.5-6.8, and elevations ranging from 1,200 to 1,350 m asl, providing favorable conditions for orchid growth. These findings demonstrate that Taman Eden 100 supports high orchid diversity and serves as an important conservation area for preserving native orchid resources in North Sumatra

Co-Authors Abd. Rasyid Syamsuri Abdul Rauf Agus Pernando Simanjuntak Arif Syahrizal Asima napitupulu Asma Ul Husna Ayu Oshin Yap Sinaga Beatrix Blandina BOEY PENG LIM Boey Peng-Lim CHAN LAI KENG Chan Lai-Keng Chandri Lidya Putri Nasution Diana Sofia Hanafiah Dwi Ningsih Susilowati DWI NINGSIH SUSILOWATI Dyanne Gisella P. Tambak Elseria Siburian Emmy Harso Kardhinata Emmy Rosita Ermando, Relly Erni Royani Harahap Erny Yuniarti Eva Sartini Bayu Eva Sartini Bayu Firdani, Citra Fristy Rebecca Hasianta Sitohang G. Gunawan Hanipah Tanjung Hapsoh Hasmawi Hasyim2 Hasmawi Hasyim2 Heri Hidayat Hilda Mei Yeni Harahap Hot Setiado Hot Setiado Hot Setiado I.M. Revandi Damanik Imam, muhammad Ira Tiarma Sari Damanik Jonatan Ginting Juli M. Hutahuruk Julita Julita Keng, Chan Chan Khairunnisa Lubis Khairunnisa Lubis Lambok Turnip Larosa Harahap Lili Herawati Siregar Linda Tri Wira Astuti Lisa Lisa Mawarni Lisnawita Lita Adelia Lollie A. P. Putri Agustina P Putri Lollie Agustina P Putri Lollie Agustina P. Putri Lollie Agustina P. Putri Lollie Agustina P. Putri Lollie Agustina P. Putri Mahyuddin Dalimunte Mariani sembiring Marpaung, Agustina Erlinda Milani, Ayu Mohammad Nasrul Hakim Roslan Mona Faronika1 Mona Faronika1 Nazriah pratiwi Nella Angelina Simanjuntak Nina Unzila Angkat Nini Rahmawati nuraminah nasution Nurhasnah Manurung, Nurhasnah Permata Sari Harahap Purba, Hans Samuel Putri Hasanah Jumroh Retno Diah Setiowati Revandy Iskandar Muda Damanik Riski Aulia Risma Damayanti Rosmayati Rosmayati Rosmayati Rosmayati Rosmayati Rosmayati Rozaliana Rozaliana Sihotang, Tambun Siti Aminah Sopa Putri Tanjung T Sabrina Tengku Sabrina Triningsih Triningsih Ulfa Ridha Andini Utri Patma1 Utri Patma1 Yoppi Operasisco Gabesius Yusuf Husni Yusuf Husni

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