Judul: Advanced Yield Trial of Doubled Haploid Mutant Rice Lines Derived from Inpari 42 Agritan GSR
Abstrak: Padi merupakan pangan penting, sehingga produksinya perlu ditingkatkan. Pemuliaan tanaman dengan mutasi dan teknik kultur antera dapat mempercepat perolehan galur murni padi untuk mendapatkan varietas unggul. Pengembangan varietas unggul memerlukan seleksi dan pengujian untuk mendapatkan galur dengan karakter agronomi baik dan hasil yang tinggi. Penelitian ini bertujuan untuk menguji daya hasil lanjutan galur-galur dihaploid mutan padi turunan Inpari 42 Agritan GSR. Penelitian dilaksanakan di Kebun Percobaan Sawah Baru, IPB, Bogor pada bulan Desember 2023 sampai April 2024. Penelitian terdiri atas satu faktor genotipe yaitu 18 galur dihaploid dan 2 varietas pembanding (Inpari 42 dan Inpari 45). Percobaan menggunakan rancangan kelompok lengkap teracak dengan 3 ulangan. Hasil penelitian menunjukkan produktivitas galur-galur dihaploid mutan padi turunan Inpari 42 Agritan GSR tidak berbeda nyata dengan varietas pembanding kecuali galur SB6-13-1-1. Galur SB6-13-1-1 mempunyai hasil yang lebih rendah dibandingkan kedua varietas pembanding. Terdapat keragaman pada beberapa karakter agronomi dan karakter komponen hasil galur-galur dihaploid. Hasil korelasi menunjukkan karakter jumlah gabah total, jumlah gabah isi, dan persen gabah isi berkorelasi nyata positif terhadap produktivitas. Hasil seleksi indeks menunjukkan terdapat 10 galur dari 18 galur dihaploid memiliki nilai indeks seleksi positif dan dapat dilanjutkan pada pengujian selanjutnya., Rice is a staple food crop in Indonesia, so ensuring its production is necessary. Plant breeding with mutation and anther culture techniques can accelerate the acquisition of pure lines of rice to obtain superior varieties. Developing superior varieties requires selecting and testing of rice lines with good agronomic characters and high yields. This study aims to select mutant of doubled haploid rice line derived from Inpari 42 Agritan GSR. The research was conducted at Sawah Baru Experimental Station, IPB, Bogor, from December 2023 to Mei 2024. The study consisted of one genotype factor, namely 18 doubled haploid lines and two check varieties (Inpari 42 and Inpari 45). The experiment used a randomized complete block design with three replications. The results showed that the productivity of all lines was not significantly different from Inpari 42 and Inpari 45 except for line SB6-13-1-1.The line SB6-13-1-1 got lower yields than the check varieties. There was variation in some agronomic characters and yield component characters of doubled haploid lines. The correlation analysis results showed that the characters of total grain number, number of filled grains, and percentages of filled grains were significantly and positively correlated with productivity. The results of selection index showed that ten lines out of 18 doubled haploid lines had a positive selection index value. Therefore, the lines can be evaluated further.
Keyword: korelasi, produktivitas, indeks seleksi, kultur antera, mutasi

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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