Judul: Pendugaan Parameter Genetik Ketahanan terhadap Penyakit Antraknosa dan Beberapa Karakter Kuantitatif pada Cabai
Abstrak: The research was conducted at Leuwikopo Experimental Field and Plant Breeding Laboratory of IPB, from October 2012 to April 2013. Crossing population between C15 and C2 genotype were used to study resistance genetic parameter for anthracnose disease caused by Colletotrichum acutatum and quantitative characters in pepper. Twenty mature green pepper fruits from each plant were inoculated by PYK 04 isolate. Experiment result showed that resistance to anthracnose in pepper was controlled by recessive gene. There were no maternal effect for all observed character except fruit length. Broad-sence heritability were high for disease incidence, necrotic diameter, plant height, stem diameter, dichotomous height, days for flowering, days for harvesting; and medium for fruit length and diameter character. Narrow-sence heritability were high for stem diameter, dichotomous height, days for flowering; medium for disease incidence, plant height, days for harvesting; and low for necrotic diameter, fuit length and diameter character. Additive-variance ratio were high for disease incidence, plant height, stem diameter, dichotomous height, and days for flowering; medium for necrotic diameter, days for harvesting, fruit diameter; and low for fruit length character. Producing pepper varieties which are resistance to anthracnose and good yield should be aimed to open pollinated varieties.
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Judul: Daya Hasil dan Ketahanan 17 Galur Cabai IPB terhadap Penyakit Antraknosa yang Disebabkan oleh Dua Spesies Colletotrichum.
Abstrak: The objective of this research was to evaluate the resistance of 17 IPB chili breeding lines and three commercial varieties to anthracnose diseases caused by Colletotrichum sp. and get their yield components information. This research was conducted from February until May 2012 at IPB Research Station Leuwikopo and Genetic and Plant Breeding Laboratory, Department of Agronomy and Horticulture IPB. This research used Randomized Complete Block Design with three replications. The result of the resistance evaluation to anthracnose using isolate TGMII04 (C. gloeosporioides) showed that eleven genotypes categorized as highly resistant and all other genotypes categorized as resistant. Meanwhile, the evaluation using isolate PYK04 (C. acutatum) showed that all genotypes categorized as highly susceptible. IPB110005- 91-13-4, Pesona I-2, and IPB009019-3-4-10 breeding lines have a better potential yield among the genotypes tested
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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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