Judul: Pengembangan Metode Seleksi Galur Murni Jagung Pulut (waxy corn) Toleran Kekeringan dan Introgresi Gen opaque-2 (oo) dengan Marka SSRs (Simple Sequence Repeats)
Abstrak: Penelitian ini bertujuan untuk menentukan metode seleksi yang dapat mengelompokkan toleransi galur murni jagung pulut (waxy corn) toleran cekaman kekeringan dan marka SSRs yang sesuai untuk introgresi gen opaque 2 (oo) ke dalam jagung pulut. Penelitian ini terdiri dari empat percobaan diantaranya adalah: Percobaan pertama untuk mengetahui hubungan kekerabatan atau jarak genetik 39 galur jagung pulut berdasarkan pola pita DNA memanfaatkan marka SSRs, dan korelasi antara matrik rata-rata jarak taksonomi berdasarkan penampilan morfologi dan koefisien kemiripan berdasarkan pola pita DNA berbasis marka SSRs. Hasil percobaan menunjukkan keragaman genetik cukup tinggi dari materi yang diuji. Hal ini ditunjukkan dengan nilai polimorfisme 0,62. Konstruksi dendogram berdasarkan UPGMA dapat membedakan galur satu dengan lainnya. Berdasarkan kemiripan genetik, galur dapat dikelompokkan menjadi tiga kluster yang dicirikan oleh galur dengan kode pedigree hampir sama. Nilai koefisien korelasi kofenetik (r) sebesar 0,88 menunjukkan good fit untuk kelompok galur jagung pulut yang ditangani. Namun korelasi antara matrik jarak taksonomi berdasarkan penampilan morfologi dengan koefisien kemiripan berdasarkan pola pita DNA menurut kriteria goodness of fit maka nilai korelasi tersebut tergolong sangat lemah. Informasi ini akan efektif dalam menyeleksi tetua dan merupakan salah satu strategi dalam program pemuliaan jagung hibrida.
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Judul: Development of selection method corn parent inbred lines for parents at hybrid waxy corn tolerant to drought and introgression of opaque-2 (oo) gene by using SSRS (Simple Sequence Repeats)
Abstrak: The Dissertation study the development of selection method corn parent inbred lines for parents at hybrid waxy corn tolerant to drought and introgression of opaque- 2 (oo) gene by using SSRs (Simple Sequence Repeats). The first experiment was to determine relation of waxy corn genotype kinship based on DNA band pattern by using SSRs marker and correlation among taxonomic distance matrix averages based on morphological performance, and similarity coefficient based on DNA band pattern getting from SSRs marker. The result showed that genetic variance of the tested material was high enough. It was indicated by polymorphism value of 0.62. Dendogram construction based on UPGMA was able to distinguish one genotype to the others. According to genetic similarity, the genotypes could be grouped into three clusters characterized by the genotypes with similar pedigree code with cofenetic correlation coefficient (r) 0.88 categorized good fit for handled waxy corn genotype groups. However, Correlation value between taxonomic distance matrix based on morphological performance and similarity coefficient based on DNA band pattern according to goodness of fit criteria was categorized as very weak. The information could used in selecting the parent and become as one of strategies in hybrid maize breeding program. The second experiment was conducted to estimate combining ability and heterosis value of ten waxy corn genotypes having high amelopectin, tolerance to drought stress environment as parent candidate of hybrid formation. The result indicated that several genotypes having good combining ability value for grain weight character per plant and interval silking anthesis under stress and drought stress environment. Grain weight character per plant on without stress and drought stress environment showed the same combining ability value, while interval silking anthesis on without stress and drought stress environment revealed different combining ability value. This information is important to determine direct or indirect selection method in selecting maize genotypes which tolerant to drought stress environment. The third experiment was conducted to introgress recessive gene opaque-2 mutant from QPM genotypes to waxy corn genotypes by using MAS (Marker Assisted Selection). The result showed that specific SSRs marker phi057 was proved effective and efficient to be used in selecting genotypes of CML141 x PTBC4-7-1- BB and CML142 x PTBC4-10-1-BB progenies that were introgressed with homozygote recessive opaque-2 (oo) gene. Selection result utilizing MAS had a tendency to follow relative segregation on every selfing generation and the number of CML141 x PTBC4-7-1-BB and CML142 x PTBC4-10-1-BB progenies were screen with phi057 specific marker. Was identified 57 genotypes of PTBC4-7-1- BBo2 and PTBC4-10-1-BBo2 as genetic materials in development of hybrid maize variety having high amilopectin and protein content. The fourth experiment was carried out to obtain information on yield potency and waxy corn genotypes having opaque-2 gene as parent candidate of hybrid variety development. The result showed that the tested genotypes had good specific combining ability value good enough to one of the good testers either with CML144 or CML156 for grain weight character per plant, and grain weight character performance of top crossing 57 genotypes with the two very varied testers. The effect of environment factor was more dominant than
Keyword: Seleksi Galur Murni, Jagung Pulut, waxy corn, Simple Sequence Repeats

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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