Judul: Evaluation of Melon Genotypes (Cucumis melo L.) for Breeding New Hybrid Varieties
Abstrak: Indonesia merupakan negara produsen serta konsumen buah melon (Cucumis melo L.), tetapi impor benih melon dari luar negeri masih cukup besar. Hal tersebut membuka peluang pemulia tanaman untuk merakit varietas hibrida unggul. Penelitian ini bertujuan mempelajari karakteristik beberapa genotipe melon dan memilih genotipe potensial untuk materi perakitan varietas hibrida baru. Genotipe yang digunakan ialah enam genotipe dari koleksi Pusat Kajian Hortikultura Tropika (PKHT) IPB (IPB G1, IPB G30, IPB G41, IPB 240, IPB 283, Glamour-S1), tiga galur inbrida PKHT IPB (IPB M13, IPB M23, IPB M21), dan satu varietas pembanding (Alisha F1). Genotipe yang memiliki potensi sebagai materi pemuliaan adalah IPB G1, IPB 240, IPB G41, dan Glamour-S1. Genotipe IPB G1 dan IPB 240 memiliki keunggulan penampakan buah menarik. Genotipe IPB G41 memiliki kandungan padatan terlarut total yang tinggi dan rasanya sangat manis. Genotipe Glamour-S1 memiliki keunggulan penampakan buah menarik serta buah yang besar. Karakter bobot buah berkorelasi positif dengan diameter buah dan panjang buah. Kandungan PTT berkorelasi positif dengan umur panen., Indonesia is a melon producing as well as consuming country, yet unfortunately, the amount and value of seed import is still high. This opens an opportunity for plant breeders to develop improved hybrid varieties. This study aimed to determine the characteristics of several melon genotypes and to select potential genotypes as breeding materials for obtaining improved hybrid varieties. The genotypes used were six genotypes from a collection of the Center for Tropical Horticulture Studies (PKHT), IPB University (IPB G1, IPB G30, IPB G41, IPB 240, IPB 283, Glamour-S1), three inbred lines from PKHT IPB (IPB M13, IPB M23, IPB M21), and one commercial hybrid variety as a check (Alisha F1). Four potential melon genotypes for breeding materials are IPB G1, IPB 240, IPB G41, and Glamour-S1. IPB G1 and IPB 240 had an attractive fruit appearance. IPB G41 had a high total soluble solids content, while Glamour S1 had a large and attractive fruit appearance. Fruit weight was positively correlated with fruit diameter and fruit length. Total soluble solids was positively correlated with days to harvest.
Keyword: Genetic diversity, Melon breeding, Potential genotypes

Judul: Plant Morphological Characteristics and  Fruit Quality of 26 Genotypes of Melon (Cucumis melo L.)
Abstrak: Melon merupakan salah satu komoditas hortikultura yang memiliki nilai ekonomis dan berpotensi untuk dikembangkan. Pembentukan varietas unggul dalam negeri perlu terus diupayakan melalui program pemuliaan tanaman. Penelitian ini bertujuan mempelajari keragaman karakteristik morfologi tanaman dan kualitas buah pada sejumlah genotipe melon hasil pemuliaan dari Pusat Kajian Hortikultura Tropika IPB, dan mengidentifikasi genotipe melon potensial untuk program pemuliaan tanaman. Penelitian dilakukan di Greenhouse C Kebun PKHT IPB Tajur 1 dan Laboratorium Pasca Panen Departemen Agronomi dan Hortikultura IPB dari bulan Oktober 2022 hingga Januari 2023. Genotipe yang dievaluasi terdiri atas 25 genotipe koleksi PKHT IPB dan satu varietas hibrida komersial sebagai pembanding yaitu Alisha F1. Percobaan menggunakan rancangan kelompok lengkap teracak (RKLT) faktor tunggal (genotipe) dengan tiga ulangan. Hasil penelitian menunjukkan bahwa genotipe berpengaruh nyata terhadap semua karakter kuantitatif yang diamati termasuk karakter kualitas buah (PTT, kekerasan kulit buah, vitamin C, dan TAT). Analisis korelasi menunjukkan bahwa diameter buah berkorelasi positif dengan bobot buah dan berkorelasi negatif dengan TAT. Genotipe G1, G41, HD 1–145, 316, HD 2–111, dan P34 berpotensi dikembangkan lebih lanjut dalam program pemuliaan., Melon is one of the horticultural commodities with significant economic value and potential for development. Breeding improved domestic varieties needs to be continuously pursued through plant breeding programs. This study aimed to elucidate the plant morphological characteristics and fruit quality of several melon genotypes from the Center for Tropical Horticulture Studies IPB and identify potential melon genotypes for plant breeding programs. The research was conducted at Greenhouse C of PKHT IPB Tajur 1 Experimental Station and Post Harvest Laboratory of the Department of Agronomy and Horticulture IPB, from October 2022 to January 2023. Genetic materials evaluated were 25 genotypes from the PKHT IPB collection and one commercial hybrid variety Alisha F1 as a check. This experiment was arranged in a randomized complete block design (RCBD) with a single factor (genotype) and three replications. The results showed that genotypes significantly influenced all quantitative traits observed including fruit quality traits (TSS, fruit skin hardness, vitamin C, and TTA). Correlation analysis among traits indicated that fruit diameter had a positive correlation with fruit weight and a negative correlation with TTA. Genotypes G1, G41, HD 1–145, 316, HD 2–111, and P34 are considered potential for further development in a breeding program.
Keyword: fruit quality, genetic variability, melon breeding, traits

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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