Judul: Kendali Genetik Sifat Ketahanan Melon (Cucumis melo. L.) Terhadap Penyakit Virus Kuning
Abstrak: Resistance to yellow virus (YV) is an important breeding character in melon. However there is limited information regarding the genetic inheritance of the character. This study aimed at providing information on genetic control for resistance to YV in melon. The research consists of three field experiments, there were evaluation of resistance to YV and parent selection, evaluation of resistance in P1, P2, F1 and F2 population, and agronomic character evaluation. The research was conducted in July 2011 - September 2012. Twenty genotypes from three major melon groups were evaluated and one line from the dudaim group (MEV1) was high resistance to YV, other lines belong to cantaloupe and inodorous showed highly susceptible performance. Resistance screening of F1 from resistance x susceptible parent showed resistance among the F1. Resistance evaluation in F2 population showed disease severity score was not in normal distribution. It means that resistance to YV was controlled by major genes. Chi square test result gave 13:3 as a suitable ratio, which the resistance to YV was controlled by two gene pair with dominant and epistasis recessive action. Nineteen genotypes were grouped into four major groups by clustering analysis with 25 variable in 85% similarity level. Group I consist of seven genotypes, MEV2, MEV3, MEV4, MEV5, MEV6, MEV7 and MEV8 (susceptible parent from cantaloupe group). Group II consist of two genotypes, MEV18 and MEV19 that belong to susceptible parent from inodorous group. Group III consist of seven genotypes, MEV2X1, MEV3X1, MEV4X1, MEV5X1, MEV6X1, MEV7X1 and MEV8X1 as a resistance F1 (cantaloupe x dudaim). Group IV consist of three genotypes, MEV18X1, MEV19X1 as a F1 ( inodorous x dudaim) and MEV1 that belong to resistance parent from dudaim group. Path analysis showed that strong leaf blade dentation gave highest negative direct effect toward virus intensity, with -0.529 as a coefficient value. It mean that leaf blade character linked with resistance to YV. Selection to plant which weak leaf blade dentation will be more enable to obtain plant which resistance to YV.
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Judul: Ketahanan tujuh varietas melon terhadap zucchini yellow mosaic ptyvirus
Abstrak: Melon (Cucumis melo L.) memiliki nilai ekonomi yang tinggi. Melon merupakan komoditas penghasil devisa ke-5 dari kelompok buah-buahan serta menduduki peringkat ke-6 dalam aspek ekspor. Varietas-varietas baru melon telah banyak diiembangkan di berbagai daerah. Pengembangan melon diiadapkan pada kendala yang besar yaitu adanya gangguan penyakit. Melon dapat terserang Zucchini yellow mosaic potyvirus (ZYMV) yang merupakan virus penting pada Cucurbitaceae. Usaha yang dilakukan untuk mendapatkan varietas unggul adalah dengan pemuliaan tanaman. Salah satu sifat unggul yang diharapkan adalah adanya ketahanan terhadap penyakit. Penelitian bertujuan mengetahui tingkat ketahanan tujuh varietas melon terhadap ZYMV dan bermanfaat mendapatkan varietas melon yang tahan terhadap ZYMV. Perbanyakan inokulum ZYMV dilakukan pada tanaman kabocha, kemudian dam yang bergejala diawetkan dengan CaC12 dan disimpan pada suhu 4 "C. Penularan ZYMV pada melon dilakukan dengan inokulasi mekanis. Varietas melon yang digunakan adalah varietas Action 434, Glamour, H7, H35, H52, H94, dan Honey dew. Seluruh varietas melon memperlihatkan gejala mosaik sistemik dan mengalami malformasi dam. Lama periode inkubasi dan besamya kejadian penyakit berbedabeda antar varietas. Seluruh tanaman melon yang terinfeksi ZYMV mengalami laju pertambahan tinggi yang lambat dibandingkan tanaman melon yang tidak terinfeksi ZYMV. Nilai absorban ELISA (NAE) cenderung meningkat pada pengujian kedua kecuali pada varietas Honey dew.
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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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