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Perbandingan Struktur Anatomi dan Kadar Klorofil antara Daun Terinfeksi dan Tidak Terinfeksi Penyakit Kuning pada Tanaman Lada Sonya, Permitha; Robika, Robika; Ropalia, Ropalia
Agrikultura Vol 34, No 1 (2023): April, 2023
Publisher : Fakultas Pertanian Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/agrikultura.v34i1.42182

Deteksi awal penyakit kuning yang disebabkan oleh nematoda parasit Radopholus similis dan Meloidogyne incognita serta cendawan patogen Fusarium oxysporum dan Fusarium solani relatif sulit, tanaman dapat diduga terinfeksi setelah menampakkan gejala menguning pada bagian daun. Perubahan struktur anatomi daun lada yang terinfeksi penyakit kuning sejauh ini belum ada laporan tertulis. Penelitian ini dilakukan untuk membandingkan struktur anatomi daun lada yang tidak terinfeksi dan terinfeksi penyakit kuning. Penelitian ini menggunakan dua metode yaitu whole mount untuk membuat sayatan paradermal dan free-hand technique untuk membuat sayatan transversal. Pengukuran kadar klorofil menggunakan spektrofotometer pada panjang gelombang 649 nm dan 665 nm. Hasil pengamatan menunjukkan bahwa kerapatan stomata dan panjang sel epidermis berbeda nyata antara tanaman lada yang terinfeksi penyakit dengan yang sehat dan tidak berbeda nyata pada karakter indeks stomata, tebal kutikula atas dan bawah, tebal epidermis atas dan bawah, tebal bunga karang, tebal palisade, panjang dan lebar sel stomata, panjang dan lebar sel penjaga, lebar sel epidermis, tebal hipodermis atas dan bawah, tebal daun, luas daun, dan kadar klorofil. Daun tanaman lada terinfeksi memiliki stomata lebih rapat dan panjang sel epidermis lebih pendek dibandingkan dengan daun pada tanaman tidak terinfeksi.

Lamun Oceana serrulata Di Perairan Provinsi Kepulauan Bangka Belitung Okto Supratman; Adi, Wahyu; Muftiadi, Muhammad Rizza; Pamungkas, Aditya; Henri, Henri; Robika, Robika; Supratman, Okto; Maharani, Maharani; Animah, Animah; Angelia, Fera; Haptari, Rapita; Emillia, Emillia
Journal of Tropical Marine Science Vol 7 No 2 (2024): Journal of Tropical Marine Science
Publisher : Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jour.trop.mar.sci.v7i2.4974

Taxonomically, according to the World Register of Marine Species (WORMS), in 2021 the naming of the species Cymodocea serrulata will change to Oceana serrulata (R. Brown) Byng & Christenh. Many studies have been carried out in the Province of the Bangka Belitung Islands, but this type of distribution map has not been presented in detail. Observation of seagrass in the field allows the identification of seagrasses with other types of seagrass. This study aimed to identify morphology, species distribution, and other types of seagrass often associated with seagrass species Oceana serrulata in the Province of the Bangka Belitung Islands. The methods in this study include data collection, identification, and map making. Morphological identification of seagrass species refers to several identification sources. The distribution map of Oceana serrulata is presented from the seagrass data collection that has been carried out. This research uses data from different times, the first was obtained from 2011 and 2022 as primary data. The results of the study explain the identification carried out on the Oceana serrulata has the same characteristics as identification literature. Similarities seen from the identification of leaf morphology which ribbon curved like, parallel leaf veins and triangular shaped sheaths. Other seagrass species that are most often associated with Oceana serrulata are Halodule uninervis and Enhalus acoroides. The map of the distribution of seagrass species Oceana serrulata is found on the islands of Bangka, Belitung, Anak Air, Lepar, Ketawai, Semujur, Kalimambang, Kelayang, Kepayang, Ruk, and Sebongkok islands.

Effect of drought stress on the anatomical structure of red flowering Hoya coronaria Blume leaves Rahmasari, Rahmasari; Henri, Henri; Robika, Robika
Biogenesis: Jurnal Ilmiah Biologi Vol 11 No 2 (2023)
Publisher : Department of Biology, Faculty of Sci and Tech, Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/bio.v11i2.37453

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Identification of Biofilm-Producing Bacteria From Nangka Island Marine Water in District of Bangka Tengah Robika, Robika; Lingga, Rahmad; Afriyansyah, Budi
JURNAL PEMBELAJARAN DAN BIOLOGI NUKLEUS Vol 8, No 1: Jurnal Pembelajaran Dan Biologi Nukleus Maret 2022
Publisher : Universitas Labuhanbatu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36987/jpbn.v8i1.2492

Bacterial community is an important element of an ecosystem both on land and in water. In aquatic ecosystems, bacteria that have the ability to produce biofilms have the advantage of being able to easily attach on a substrate. The main function of biofilm is assisting nutrition absorption from water and facilitating bacteria surviveness from unfavorable environmental conditions. This research was conducted to isolate and identify and test the potential of bacteria to form biofilms in vitro. The methodological steps included measuring the physical-chemical parameters of the waters; isolation by pour plating method; characterization and identification Â based on morphological, biochemical and Gram staining; as well as testing the activity of biofilm formation by reading technique using microplate reader. The highest bacterial abundance was found at Station 3 (muddy substrate) which was 3.3x106 cfu/ml. Bacterial isolates that had the highest ability to form biofilms in vitro were Bb3, Bb4 and Bb1 isolates with values of 0.3315, 0.2370) and 0.2131, respectively. Bacteria that have the potential to form biofilms from various substrates in the waters of Nangka Island belong to Alcaligenes and Meniscus genera. From the results of the study, it can be concluded that bacteria from rocky substrates have the ability to produce biofilms better than isolates from other substrates.

Fenologi Pembungaan dan Pembuahan pada Tumbuhan Rukam (Flacourtiar rukam Zoll. & Moritzi) Juwita, Agustara Dwi; Robika, Robika; Akbarini, Dian
Biota Vol 17 No 2 (2024)
Publisher : Universitas Islam Negeri Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar

Rukam is one of the fruiting plants that grow wild in the forest or are planted. Excessive utilization without cultivation efforts triggers a decrease in the population of a species in nature until a species disappears from nature. Flacourtia rukam has most recently been assessed for The IUCN Red List of Threatened Species in 2023. Flacourtia rukam is listed as Least Concern. Therefore, knowledge of flower and fruit development is needed to determine the effectiveness of production on rukam plants through phenological studies. This study was conducted to obtain information through morphological changes that occur and the length of time required during the flowering process to fruit formation on rukam. This research was conducted by directly observing and measuring the parts of the inflorescence from the process of fruit formation until the fruit ripenning. The results showed that the morphological structure of rukam flowers is incomplete. The phenology of rukam flowering and fruiting takes 56 - 61 days starting with the flower initiation phase and ending with the mature fruit phase. The stages of morphological changes in flower development can be divided into initiation, small flower buds, large flower buds, and blooming flowers (anthesis). While the stages of morphological changes in fruit, color and size can be divided into young fruit, mature fruit, ripe fruit, and deciduous fruit. All stages of color change occur during the fruit ripening process

Fitoanatomi Porang di Lahan Pasca Tambang Timah dengan Perlakuan Dosis Pupuk Organik Robika, Robika; Irwanto, Riko; Sanputra, Andre
Bioma : Berkala Ilmiah Biologi Vol. 26 No 2, Tahun 2024
Publisher : Departemen Biologi, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/bioma.2024.62887

Tanaman porang memiliki nilai ekonomis yang banyak dibudidayakan dengan pemanfaatan tailing pasir pasca tambang timah di Bangka melalui penggunaan pupuk organik. Struktur anatomi daun tanaman porang dapat digunakan untuk mengindikasikan efektifitas pertumbuhan porang di pasir tailing pasca tambang. Penelitian ini bertujuan mengetahui karakteristik anatomi daun porang dan pengaruh dosis pupuk organik di pasir tailing pasca tambang. Penanaman porang dilakukan di kebun percobaan pada media tanah tailing dengan perlakuan dosis pupuk organik yaitu D05 = 5 ton kompos kotoran sapi per ha (45 g/tanaman), D15 = 15 ton kompos kotoran sapi per ha (135 g/tanaman), D25 = 25 ton kompos kotoran sapi per ha (225 g/tanaman) dan kontrol. Pengamatan dilakukan secara laboratorik kemudian dianalisis menggunakan uji ANOVA taraf signifikansi 95% dan Uji Duncan (DMRT) 5%. Hasil penelitian menunjukkan perlakuan dosis pupuk 45 g/tanaman beda nyata pada indeks stomata sebesar 16,31%, dosis pupuk 225 g/tanaman adanya beda nyata pada kerapatan stomata sebesar 110,49 mm2 dan lebar pembuluh angkut 40,66 µm, sedangkan perlakuan 135 g/tanaman tidak ditemukan beda nyata. Peningkatan dosis pupuk mempengaruhi perubahan anatomi daun porang yaitu kerapatan stomata, indeks stomata, lebar epidermis atas dan pembuluh angkut. Pengaplikasian dosis optimal sesuai karakteristik anatomi pada tanaman yaitu 135 g/tanaman & 225 g/tanaman.

Lamun Oceana serrulata Di Perairan Provinsi Kepulauan Bangka Belitung Adi, Wahyu; Muftiadi, Muhammad Rizza; Pamungkas, Aditya; Henri, Henri; Robika, Robika; Supratman, Okto; Maharani, Maharani; Animah, Animah; Angelia, Fera; Haptari, Rapita; Emillia, Emillia
Journal of Tropical Marine Science Vol 7 No 2 (2024): Journal of Tropical Marine Science
Publisher : Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jour.trop.mar.sci.v7i2.4974

Taxonomically, according to the World Register of Marine Species (WORMS), in 2021 the naming of the species Cymodocea serrulata will change to Oceana serrulata (R. Brown) Byng & Christenh. Many studies have been carried out in the Province of the Bangka Belitung Islands, but this type of distribution map has not been presented in detail. Observation of seagrass in the field allows the identification of seagrasses with other types of seagrass. This study aimed to identify morphology, species distribution, and other types of seagrass often associated with seagrass species Oceana serrulata in the Province of the Bangka Belitung Islands. The methods in this study include data collection, identification, and map making. Morphological identification of seagrass species refers to several identification sources. The distribution map of Oceana serrulata is presented from the seagrass data collection that has been carried out. This research uses data from different times, the first was obtained from 2011 and 2022 as primary data. The results of the study explain the identification carried out on the Oceana serrulata has the same characteristics as identification literature. Similarities seen from the identification of leaf morphology which ribbon curved like, parallel leaf veins and triangular shaped sheaths. Other seagrass species that are most often associated with Oceana serrulata are Halodule uninervis and Enhalus acoroides. The map of the distribution of seagrass species Oceana serrulata is found on the islands of Bangka, Belitung, Anak Air, Lepar, Ketawai, Semujur, Kalimambang, Kelayang, Kepayang, Ruk, and Sebongkok islands.

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