Judul: Tolerance Level of Mini Lamtoro (Desmanthus virgatus) to Salinity Stress through Tissue Culture Techniques
Abstrak: Lamtoro mini (Desmanthus virgatus) memiliki potensi tinggi sebagai sumber pakan ternak dan peluang dalam pengembangan tanaman pakan di daerah salin. Penelitian ini bertujuan untuk mendapatkan informasi tingkat toleransi tanaman Lamtoro mini terhadap cekaman salinitas pada level yang berbeda dengan teknik kultur jaringan. Metode yang digunakan yaitu Rancangan Acak Lengkap (RAL) dengan 5 perlakuan dan 25 ulangan. P0 (NaCl 0 ppm), P1 (NaCl 2500 ppm), P2 (NaCl 5000 ppm), P3 (NaCl 7500 ppm), dan P4 (NaCl 10000 ppm). Data yang dihasilkan dianalisis menggunakan software SPSS versi 26. Peubah yang diamati yaitu tinggi tanaman, jumlah daun majemuk, jumlah ranting daun, warna daun, kerontokan daun, dan viabilitas tanaman. Hasil penelitian menunjukkan bahwa penambahan NaCl dengan level lebih dari 2500 ppm berpengaruh nyata terhadap tinggi tanaman, jumlah daun majemuk, jumlah ranting daun, dan warna daun, namun tidak berpengaruh nyata terhadap kerontokan daun dan viabilitas tanaman. Simpulan penelitian menunjukkan tanaman Lamtoro mini memiliki tingkat toleransi terhadap cekaman salinitas hingga level 2500 ppm., Lamtoro mini (Desmanthus virgatus) has high potential as a source of animal feed and opportunities in the development of forage crops in saline areas. This study aims to obtain information about the tolerance level of Lamtoro mini to salinity stress at different levels using tissue culture techniques. The method used was Completely Randomized Design (CRD) with 5 treatments and 25 replications. P0 (NaCl 0 ppm), P1 (NaCl 2500 ppm), P2 (NaCl 5000 ppm), P3 (NaCl 7500 ppm), and P4 (NaCl 10000 ppm). The resulting data were analyzed using SPSS version 26 software. The variables observed were plant height, number of compound leaves, number of leaf twigs, leaf color, leaf loss, and plant viability. The results showed that the addition of NaCl with a level of more than 2500 ppm had a significant effect on plant height, number of compound leaves, number of leaf twigs, and leaf color, but had no significant effect on leaf loss and plant viability. The conclusion of the study showed that the mini Lamtoro plant has a tolerance level of salinity stress up to a level of 2500 ppm.
Keyword: Lamtoro mini, tolerance level, salinity, tissue culture

Judul: Growth Characteristics of Mutant Lamtoro Var.  Tarramba Acid Tolerant pH 3.4 on Field Scale at JASTRU Jonggol
Abstrak: Peningkatan adaptabilitas mutan lamtoro var. tarramba pada kondisi masam pH 3,4 diharapkan tidak menurunkan potensi adaptasinya pada lingkungan normal skala lapang. Evaluasi karakteristik pertumbuhan mutan tanaman lamtoro var. tarramba pada skala lapang dilaksanakan di Unit Pendidikan dan Penelitian Peternakan Jonggol (UP3J). Tujuan penelitian ini adalah mengevaluasi karakteristik pertumbuhan mutan lamtoro var. tarramba toleran masam pH 3,4 pada skala lapang di UP3J. Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) dengan 11 mutan lamtoro (T1-T11) yang terdiri dari masing masing lima ulangan dan lamtoro kontrol positif (T0) yang terdiri dari empat ulangan. Data morfologi (tinggi tanaman, diameter batang, jumlah ranting, dan jumlah tangkai induk daun majemuk) dianalisis dengan sidik ragam (ANOVA). Hasil yang berbeda nyata dilakukan analisis lanjut DMRT. Data warna tanah rizosfer, pH rizosfer, warna daun, dan serangan hama kutu loncat dianalisis secara deskriptif. Variabel penelitian terdiri dari warna tanah rizosfer, pH tanah rizosfer, tinggi tanaman, diameter batang, jumlah ranting, jumlah tangkai induk daun majemuk, warna daun, dan serangan hama kutu loncat. Hasil penelitian menunjukkan mutan T10, T11, dan T12 menghasilkan nilai pH akhir rizosfer yang cenderung lebih masam dibandingkan tanaman lainnya. Mutan tanaman lamtoro var. tarramba toleran masam pH 3,4 pada media tanah kategori agak masam hingga netral memberikan hasil sama baik dengan kontrol positif lamtoro var. tarramba pada parameter karakteristik morfologi, warna daun, serta serangan hama kutu loncat, Improved adaptability of lamtoro var. tarramba in acid condition pH 3.4 in controlled enviroments is expected not to reduce its potential adaptation in the normal environment of the field scale. Evaluation of the growth characteristics of lamtoro var. tarramba mutant on the filed scale was carried out at the Jonggol Animal Science Teaching and Research Unit (JASTRU). The aim of this study is to evaluate the growth characteristics of lamtoro var. tarramba mutant acid tolerant pH 3.4 on a field scale at JASTRU. This study was designed by using Randomized Block Design (RBC) with 11 lamtoro mutants (T1-T11) consisting of five replications and positive control lamtoro (T0) consisting of four replications. Morphological data (plant height, stem diameter, number of twigs, and number of compound leaf stalks) were analyzed using analysis of variance (ANOVA). The significant different result futher analyzed with DMRT. Data of rhizosphere soil color, rhizosphere pH, leaf color, and fleas attack were analyzed descriptively. Observed variables consisted of rhizosphere soil color, rhizosphere pH, plant height, stem diameter, number of twigs, number of stalks of compound leaf, leaf color, and fleas attack. The results showed mutants with code T10, T11, and T12 produced the final rhizosphere pH more acidic than others. Mutant of lamtoro var. tarramba acid tolerant pH 3.4 on moderately acidic to neutral soil media is as good as positive control of lamtoro var. tarramba on morphological characteristics, leaf color, and attack of fleas variables.
Keyword: genetics, growth characterstics, lamtoro var. tarramba mutant, nutrient uptake

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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