Judul: Selection of Potential Genotypes and Traits Evaluation of Honeydew (Cucumis melo L.).
Abstrak: Quality improvements of honeydew (Cucumis melo L.) can be carried out by developing superior hybrid varieties. This study aimed to identify potential genotypes with good fruit quality for breeding improved hybrid varieties. Two experiments were conducted from March to September 2019 at the Tajur II experimental station of the Center for Tropical Horticulture Studies (PKHT), IPB University, Bogor. The first experiment was the evaluation of S2 genotypes, and the second was the evaluation of the test crosses. Both experiments were arranged in a single-factor randomized complete block design with three replications. The first experiment evaluated ten genotypes, i.e., six S2 genotypes (IPB HD 1, IPB HD 2, IPB HD 3, IPB HD 4, IPB HD 5, IPB HD 6), three inbred lines as testers (SMM, SMF, and OMM), and one check variety (Alisha F1). Fourteen hybrids from S2 x testers were produced and subsequently tested in the second experiment with one check variety (Alisha F1). The results from both experiments indicated that the genotype had significant effects on fruit traits, except skin thickness in the S2 experiment and total soluble solids in the testcross experiment. IPB HD 1 and IPB HD 4 had good fruit traits and produced good hybrids as well. These genotypes are therefore predicted to have good potential for developing improved hybrid honeydew varieties.
Keyword: genetic diversity, fruit quality, melon breeding

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: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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