Judul: Yield Trial of Doubled-Haploid Lines of  Black Rice in Kediri Regency  East Java
Abstrak: Kebutuhan beras fungsional meningkat seiring waktu, salah satu usaha yang dapat dilakukan untuk meningkatkan produktivitasnya ialah dengan pemuliaan tanaman. Pemuliaan secara konvensional membutuhkan waktu yang lama, sedangkan dengan kultur antera waktu pemuliaan menjadi lebih singkat. Penelitian ini bertujuan mendapatkan galur-galur dihaploid padi beras hitam dengan produktivitas hasil sama atau lebih baik dari varietas pembanding. Penelitian dilaksanakan di Kecamatan Kepung, Kabupaten Kediri Jawa Timur pada September 2020 - Maret 2021. Percobaan menggunakan rancangan kelompok lengkap teracak (RKLT) satu faktor dengan tiga ulangan. Galur yang diuji sebanyak 14 galur dengan dua varietas pembanding yaitu Aek Sibundong dan Jeliteng. Hasil penelitian menunjukkan terdapat 8 galur memiliki produktivitas setara dengan varietas Aek Sibundong, 6 galur memiliki produktivitas setara dengan Varietas Jeliteng dan 3 galur memiliki produktivitas lebih tinggi dibanding dua varietas pembanding. Dari 14 galur yang diuji, 9 galur menghasilkan warna beras coklat dan 5 galur menghasilkan warna beras ungu kehitaman. Galur-galur padi tersebut memiliki karakter unggul dengan jumlah anakan sedikit, tinggi tanaman rendah sampai sedang, jumlah gabah isi banyak, bobot 1000 butir besar dan umur panen genjah. Galur-galur terpilih dapat diuji di lokasi lainnya, diuji kualitas dan ketahanannya terhadap hama penyakit., The need for functional rice increases over time. Effort that can be made to increase its productivity is through plant breeding. Conventional breeding takes a long time, while breeding through anther culture can shorten the time. This study aimed at obtaining doubled-haploid lines of black rice with productivity similar or better than check varieties. The experiment was conducted in Kepung Subdistrict, Kediri, East Java in September 2020 - March 2021. The experiment used a one factor randomized complete block design (RCBD) with three replications. The lines were 14 with two check varieties namely Aek Sibundong and Jeliteng. The results showed that there were 8 lines had productivity equivalent to Aek Sibundong Variety, 6 lines had productivity equivalent to Jeliteng Variety and 3 lines had higher productivity than the two check varieties. Of the 14 lines tested, 9 lines produced brown rice color and 5 lines produced black purple rice color. The rice lines had superior characters with a small-number of tillers, low to medium height, many filled grain, large grains and the harvest age of early to medium. Selected lines can be tested at other locations, also for qualities and resistance to pests and diseases.
Keyword: anthocyanins, black rice, multilocation, productivity

Judul: Yield Trial of Doubled-Haploid Salinity Tolerant Rice in Bogor Regency, West Java
Abstrak: Perubahan iklim menyebabkan terjadinya cekaman terhadap produksi padi di Indonesia, salah satu cekaman iklim itu adalah salinitas. Perakitan varietas padi toleran salinitas perlu dilakukan dengan waktu yang singkat dan salah satu metode yang dapat digunakan ialah dengan kultur antera. Pemuliaan secara konvensional membutuhkan waktu yang lama, sedangkan dengan kultur antera waktu pemuliaan menjadi lebih singkat. Penelitian ini bertujuan mendapatkan galur-galur dihaploid padi toleran salinitas dengan produktivitas hasil sama atau lebih baik dari varietas pembanding. Penelitian dilaksanakan di Kecamatan Dramaga, Kabupaten Bogor Jawa Barat pada Oktober 2021 - Maret 2022. Percobaan menggunakan rancangan kelompok lengkap teracak (RKLT) satu faktor dengan tiga ulangan. Galur yang diuji sebanyak 12 galur dengan empat varietas pembanding yaitu Inpari 18, Inpari 32, Inpari 34 dan Ciherang. Hasil penelitian menunjukkan semua galur yang diuji memiliki produktivitas setara dengan ke empat varietas pembanding. Produktivitas galur dihaploid padi toleran salinitas berkisar 4,00-5,20 ton GKG ha-1 , sedangkan produktivitas varietas pembanding berkisar 3,30-4,72 ton GKG ha-1 . Galur HS4- 15-1-70 memiliki produktivitas tertinggi (5,20 ton GKG ha-1 ). Galur-galur padi tersebut memiliki karakter unggul dengan jumlah anakan sedikit sampai sedang, tinggi tanaman pendek sampai sedang, jumlah gabah isi banyak, bobot 1000 butir besar dan umur panen genjah. Galur-galur tersebut dapat diuji di lokasi lainnya, diuji kualitas beras dan nasi dan ketahanannya terhadap hama penyakit penting., Climate change causes stress on rice production in Indonesia, one of which is salinity. Breeding salinity tolerant rice varieties needs to be done. Conventional breeding takes a long time, while with anther culture the time needed is shorter. The aim of this study was to obtain doubled haploid lines of salinity tolerant rice with yields equal to or better than the check varieties. The study was conducted in Dramaga District, Bogor Regency, West Java, from October 2021 to March 2022. The experiment used a one-factor in a randomized complete block design with three replications. There were 12 lines tested with four check varieties, namely Inpari 18, Inpari 32, Inpari 34 and Ciherang. The results showed that all tested lines had productivity equivalent to the four check varieties. Productivity of doubled haploid lines ranged 4.00-5.20 ton dry ready to mill rice ha-1 , while check varieties ranged 3.30-4.72 ton dry ready to mill rice ha-1. HS4-15-1-70 showed the highest productivity (5.20 ton dry ready to mill rice ha-1 ). These rice lines have superior characters with a small to medium number of tillers, short to medium plant height, a large number of filled grain contents, high weight of 1000 grains and an early harvest age. Selected lines can be tested in other locations, tested for quality and resistance to pests and disease.
Keyword: climate change, salinity tolerant rice, productivity

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.
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