Judul: Evaluasi Kemurnian Genetik dengan Marka Mikrosatelit dan Aplikasi Rizobakteri untuk Meningkatkan Produksi dan Mutu Fisiologis Benih Jagung Hibrida
Abstrak: One effort to improve maize production is through the use of high quality maize seed. In order to assure high quality seed, it’s genetic quality must be tested. SSR markers often used in genetic studies of maize plants. Therefore SSR can be used to analyze the genetic purity of maize hybrid seed. Another effort to increase productivity and physiological quality of maize hybrid seeds is using rhizobacteria and phosphate fertilizer. The objectives of this research were 1) to determine SSR markers specific for male and female parents, 2) to know the effectiveness of SSR markers for the genetic purity testing of maize hybrid seeds, 3) to find non phytopathogenic rhizobacteria isolates capable of dissolving phosphate, producing IAA, and improving the physiological quality of seed and seedling growth of female parent of maize hybrid, 4) to assess the effect of rhizobacteria and phosphate fertilizers to increase plant growth and yield female parent of maize hybrid, 5) to investigate the effect of rhizobacteria and P fertilizer for increasing productivity and physiological quality of maize hybrid seed. This research consisted of four stages: (1) Selection of SSR primers specific for female and male parents, and testing of genetic purity of hybrid maize seed using SSR markers, (2) Characterization of rhizobacteria in producing IAA, dissolving unsoluble forms of phosphate, non phytopathogenic (hypersensitive reaction test), and improving the physiological quality of maize hybrid seed, (3) Testing the effectiveness of rhizobacteria and phosphate fertilizer on plant growth of female parent in polybag, and (4) Evaluation the effectiveness of rhizobacteria and phosphate fertilizer to increase productivity and the physiological quality of maize hybrid seed in the field. All stages of the research were conducted from April 2011 until December 2012. Results of experiment 1 showed that: 1) Out of five markers tested, three markers namely phi96100, phi328175 and phi072 produced polymorphic bands and were able to distinguish parental lines of two maize hybrid varieties. SSR marker phi96100 was specific for detection the genetic purity of cv.Bima-4 and phi072 for cv.Bima-3. While phi328175 was specific markers to both maize hybrids. The genetic purity of cv.Bima-3 and cv. Bima-4 were 97.5% and 80% respectively. Results of experiment 2 showed that from 34 rhizobacteria isolates, consisted of Actinomycetes, Bacillus spp., and Fluorescent pseudomonads, five isolates of each group having characteristic of dissolving phosphate, producing IAA, and non phytopathogenic. B28 and B46 isolates increased growth rate and vigour index of female parent seeds of hybrid maize. AB2, ATS4, B28, P14, and P31 isolates were selected based on the ability to improve the physiological seed quality of female parent and the rhizobacteria B42 based on the highest production of IAA. These isolates were then used in the field experiment. Results of experiment 3 showed that phosphate fertilizer did not effect the plant growth, weight of ear, and weight kernel per ear but rhizobacteria B42 isolate was potential to increase plant growth compared the control and other rhizobacteria. B28 isolate was potential to increase weight of ear, and weight kernel per ear. Results of the field experiment showed that at the first planting season (rainy
Keyword: Actinomycetes, Fluorescent pseudomonads, parental lines of maize hybrid, seed storage, SSR marker

Judul: Agronomic Performance and Yield Potential of 30 Maize Hybrids under Biotic Stress Conditions
Abstrak: Jagung adalah komoditas yang memiliki nilai ekonomis dengan permintaan meningkat setiap tahunnya sehingga perlu dilakukan peningkatan potensi hasil. Banyak faktor yang mempengaruhi potensi hasil jagung sehingga perlu dilakukan pengujian terhadap calon varietas baru. Penelitian ini bertujuan mengevaluasi keragaan agronomi dan potensi hasil 30 hibrida jagung. Penelitian dilaksanakan di Grujukan, Puger Kulon, Jember mulai dari bulan September 2020 hingga Januari 2021. Rancangan percobaan yang digunakan yaitu rancangan kelompok lengkap teracak dengan tiga ulangan. Terdapat 32 genotipe yang diuji yaitu 30 genotipe berasal dari persilangan antara galur IPB dengan galur koleksi Balitsereal dan dua varietas pembanding (BISI 2 dan NK6172). Hasil penelitian menunjukkan bahwa terdapat keragaman antar genotipe pada karakter daya tumbuh, umur berbunga jantan, tinggi tanaman, tinggi tongkol utama, diameter batang, diameter tongkol, jumlah baris biji, jumlah biji dalam baris, bobot tongkol, bobot biji per tongkol, bobot seribu biji, kadar air, dan rendemen hasil. Genotipe juga berpengaruh nyata terhadap ketahanan terhadap serangan ulat dan bulai. Terdapat sepuluh genotipe uji yang memiliki potensi hasil setara dengan kedua varietas pembanding, dan yang terbaik diantaranya yaitu P13xNei., Maize is a commodity having a high economic value with increasing demand over years, and therefore it is necessary to increase its production. Several factors affected maize yield, so it is important to evaluate the prospective of new varieties. This research aimed to evaluate the agronomic performance and yield potential of 30 maize hybrids. The research was conducted at Grujukan, Puger Kulon, Jember from September 2020 to January 2021. The experimental design was a randomized complete block design with three replications. Thirty two maize hybrids, consisting of 30 hybrids of IPB lines x ICERI lines, and two commercial hybrid varieties as checks (BISI 2 and NK6172), were evaluated. The results indicated variations among genotypes for character of growth percentage, days to anthesis, plant height, main ear height, stem diameter, ear diameter, number of grain rows per ear, number of grain in rows, ear weight, grain weight per ear, 1000 grain weight, grain moisture, and yield percentage. In addition, the genotype also had significant effects on fall armyworm and downy mildew resistance. Ten test hybrids had a comparable yield potential with the two check varieties, and the best among which was P13xNei.
Keyword: hybrid evaluation, maize breeding

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: