Judul: Stability test of Marigold genotype MG21 (Tagetes patula L.) at M3 Generation as a result of induced mutation by colchicine and oryzaline
Abstrak: Tanaman marigold genotipe MG21 (Tagetes patula L.) merupakan salah satu tanaman hias bunga yang berasal dari Amerika Selatan. Tanaman marigold genotipe MG21 belum banyak dikenal di Indonesia, hal ini disebabkan bunganya yang kecil, daunnya yang terlalu lebat, dan budidayanya yang memakan waktu lama. Akan tetapi, tanaman marigold genotipe MG21 masih dapat dikembangkan, salah satu cara pengembangannya adalah dengan program pemuliaan. Program pemuliaan telah dilakukan terhadap tanaman marigold genotipe MG21 yaitu melalui pemuliaan mutasi dengan kolcisin dan orizalin. Program pemuliaan tanaman akan meningkatkan keragaman tanaman namun akan membuat tanaman menjadi tidak stabil secara genetik sehingga tanaman dapat mengalami mutasi pada beberapa generasi lanjutan. Maka dari itu, uji stabilitas genetik perlu dilakukan. Pada penelitian ini dilakukan uji stabilitas pada tujuh genotipe tanaman generasi M3 dari marigold genotipe MG21 yang diberi perlakuan kolcisin dan orizalin. Hasil pengujian menunjukkan bahwa dari ketujuh genotipe yang diuji ada satu genotipe tanaman yang sudah stabil secara genetik. Akan tetapi, pengujian kestabilan pada tanaman marigold genotipe MG21 yang diberi perlakuan pemuliaan mutasi sebaiknya tidak dilakukan pada generasi M3 karena mayoritas genotipe belum stabil secara genetik pada generasi M3., Marigold genotype MG21 (Tagetes patula L.) is one of many flowering ornamental plant originated from South America. In Indonesia, this plant haven’t been known much because of the small flower, bushy leaves, and long planting period. But, this plant has many potential to be improved, one of many ways of improving it is by doing plant breeding program. Plant breeding program has been caried out on marigold genotype MG21 through mutation breeding using colchicine and oryzaline. Plant breeding program can increase plants genetic variation but also not genetically stable. Therefore, stability test need to be done. In this experiment, stability test is done on seven genotype at M3 generation from marigold MG21 that has been mutated using colcichine and oryzaline. The results shows that from seven tested genotype, there is one genotype that already genetically stable. But, it’s not recommended to do stability test on marigold genotype MG21 that has been mutated using colchicine and oryzaline at M3 generation because the majority of genotype tested shows it’s not stable enough at this generation.
Keyword: Colchicine, Marigold, Mutation, Oryzaline, Stable

Judul: Vegetative Characteristic Evaluation of Tip Cuttings on Various Genotypes of Marigold (Tagetes erecta L.)
Abstrak: Tanaman hias marigold (Tagetes erecta L.) merupakan salah satu tanaman hias yang banyak dibudidayakan di Indonesia karena memiliki beragam manfaat. Pada tanaman marigold diketahui terdapat mutan steril jantan yang memiliki bunga dominan ray flower sehingga sulit untuk didapatkan biji yang fertil. Penelitian oleh tim peneliti IPB telah menghasilkan beberapa genotipe yang memiliki bunga dominan ray flower sehingga perbanyakan secara vegetatif perlu dipelajari. Penelitian ini bertujuan untuk mengevaluasi karakter vegetatif beberapa genotipe tanaman marigold hasil rakitan peneliti IPB untuk mendapatkan genotipe yang potensial untuk diperbanyak melalui stek pucuk. Penelitian dilaksanakan di Green House Kebun Percobaan Leuwikopo IPB pada bulan April – Agustus 2021. Rancangan yang digunakan pada penelitian ini adalah Rancangan Kelompok Lengkap Teracak (RKLT) faktor tunggal dengan 38 genotipe uji serta uji lanjut Tukey pada taraf a 5%. Berdasarkan hasil penelitian, beberapa genotipe menujukkan respon yang baik terhadap perlakuan induksi akar menggunakan NAA dan Vitamin B1 (thiamin). Analisis ragam yang dilakukan pada karakter pengamatan tinggi tanaman, diameter batang dan jumlah cabang memberikan nilai F value yang lebih besar dibanding F tabel sehingga dapat disimpulkan bahwa genotipe berpengaruh nyata pada ketiga karakter vegetatif yang diamati. Pada pengamatan tinggi tanaman, genotipe PM MV3 0.5 C 21.2.11, 8 S2, dan X MV3 40.36.37.1 memberikan hasil yang berbeda nyata. Pada pengamatan diameter batang, terdapat 16 genotipe yang memberikan hasil berbeda nyata yaitu genotipe PM MV3 0.5 C 21.1.12, PM MV3 0.5 C 21.2.11, PM MV3 20.23.2.21, 5 S2, V MV3 30, 13 S2, PM S MV3 0.5 C, MR MV2 50.13.4, 12 S2, V MV3 30.3.37, 10 S2, PM MV3 40.5.2.2, MR MV3 30.6.2.8, 9 S2, 8 S2, dan X MV3 40.36.37.1. Pada karakter jumlah cabang, genotipe PM MV3 0.5 C 21.1.12 dan X MV3 40.36.37.1 memberikan hasil yang berbeda nyata., The ornamental plant, marigold (Tagetes erecta L.), is one of the widely cultivated ornamental plants in Indonesia due to its various benefits. In marigold plants, it is known that there are male sterile mutants with dominant ray flowers, making it difficult to obtain fertile seeds. Research conducted by the IPB research team has produced several genotypes with dominant ray flowers, thus vegetative propagation needs to be studied. This study aims to evaluate the vegetative characteristics of several genotypes of marigold plants resulting from IPB researchers' breeding to identify genotypes with potential for propagation through stem cuttings. The research was conducted at the Green House of Kebun Percobaan IPB Leuwikopo from April to August 2021. The design used in this study was a Completely Randomized Design (CRD) with a single factor with 38 test genotypes and Tukey's advanced test at a 5% level. Based on the research results, several genotypes showed good responses to root induction treatments using NAA and Vitamin B1 (thiamine). Analysis of variance performed on plant height, stem diameter, and number of branches provided F values greater than the F table, indicating that genotypes significantly influenced the three observed vegetative characters. In plant height observation, genotypes PM MV3 0.5 C 21.2.11, 8 S2, and X MV3 40.36.37.1 showed significantly different results. In stem diameter observation, there were 16 genotypes that showed significantly different
Keyword: marigold, karakter vegetatif, induksi akar, ray flower

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
Keyword: