Judul: Yield Trial of 12 Promising Lines of F11 Generation Lowland Rice at Brebes Regency
Abstrak: Uji adaptasi merupakan proses pengujian daya hasil dan daya adaptasi dari galur-galur di lokasi yang berbeda. Uji daya hasil dan daya adaptasi merupakan tahapan kegiatan pemuliaan tanaman untuk menghasilkan varietas unggul baru. Penelitian ini bertujuan menguji dan mengevaluasi daya hasil 12 galur padi sawah populasi IPB187, IPB189, IPB191, IPB193, dan IPB194 generasi F11. Penelitian dilakukan di Desa Bentar Kecamatan Salem Kabupaten Brebes, sejak Oktober 2020 sampai Maret 2021. Penelitian ini menggunakan rancangan kelompok lengkap teracak (RKLT) faktor tunggal yaitu genotipe yang terdiri dari 12 galur IPB dan 2 varietas pembanding dengan tiga ulangan. Hasil Penelitian menunjukkan IPB 189-F-13-1-1 (6,386 ton ha-1), IPB 189-F-23-2-2 (6,774 ton ha-1), dan IPB 193-F-17-2- 3 (7,142 ton ha-1) memiliki daya hasil yang setara atau lebih tinggi serta memiliki karakter agronomi yang lebih baik daripada varietas pembanding, yaitu Ciherang (4,921 ton ha-1) dan Inpari 32 (5,642 ton ha-1)., Evaluation at multi-environment is needed to evalute the adaptability of breeding lines as a process toward vatiety release. This study aims to evaluate 12 lowland rice linesfrom IPB187, IPB189, IPB191, IPB193, and IPB194 populations. The research was conducted in Bentar Village, Salem District, Brebes Regency, from October 2020 to March 2021. The study used a single factor randomized complete block design (RKLT), with three replications. Twelve lines were evaluated with two national varieties, Ciherang and Inpari 32, as check. The results showed several lines have better productivity compared to check i.e IPB 189-F-13-1-1 (6.386 ton ha-1), IPB 189-F-23-2-2 (6.774 ton ha-1), and IPB 193-F-17-2-3 (7.142 ton ha-1 ) while check vareties Ciherang and Inpari 32 produced at 4.921 ton ha-1 and 5.642 ton ha-1, respectively.
Keyword: adaptation test, yield power, new plant type

Judul: Preliminary Yield Trial of 84 Lowland Rice Lines (Oryza sativa L.) of F5 and F6 Generation.
Abstrak: Beras merupakan sumber karbohidrat utama masyarakat Indonesia. Peningkatan potensi produktivitas padi untuk mencukupi kebutuhan masyarakat terus dilakukan melalui perbaikan mutu dengan kegiatan pemuliaan tanaman dimana salah satu tahapannya yaitu uji daya hasil pendahuluan. Penelitian ini bertujuan menguji daya hasil dan keragaan galur harapan padi generasi F5 dan F6 untuk memperoleh galur yang memiliki daya hasil dan karakter agronomi lebih baik sebagai galur yang akan diuji pada tahapan berikutnya. Penelitian dilaksanakan pada bulan Februari hingga Juli 2023 di Kebun Percobaan Sawah Baru, Kecamatan Dramaga, Bogor dan Laboratorium Pemuliaan Tanaman. Percobaan menggunakan Rancangan Kelompok Lengkap Teracak faktor tunggal dengan 84 galur dan 2 varietas pembanding sebagai perlakuan. Hanya galur IPB200-F-42 dengan daya hasil nyata lebih tinggi daripada Inpari 32 (4,58 ton ha-1) dengan produktivitas sebesar 7,16 ton ha-1, namun tidak berbeda nyata dengan Ciherang (5,21 ton ha-1) berdasarkan analisis statistik. Meskipun demikian, terdapat galur yang cenderung memiliki produktivitas lebih tinggi daripada varietas pembanding berdasarkan nilai rataan serta memiliki karakter agronomi sesuai dengan kriteria PTB. Galur-galur tersebut yaitu IPB200-F-2, IPB200-F-14, IPB200-F-15, IPB200-F-17, IPB204-E-6, IPB200-F-21, IPB200-F-22, IPB200-F-25, IPB204-E-10, IPB201-F-16, IPB200-F-43, IPB200-F-44, IPB187-F-40-1-1., Rice is the main source of carbohydrates for Indonesian people. Increasing the potential for rice productivity to meet community needs continues to be carried out through quality improvement through plant breeding activities, where one of the stages is preliminary yield testing. This study aims to test the yield and performance of the expected lines of F5 and F6 generations of rice in order to obtain lines that have better yield and agronomic characteristics as lines to be tested in the next stage. The research was conducted from February to July 2023 at the Sawah Baru Experimental Garden, Dramaga District, Bogor, and the Plant Breeding Laboratory. The experiment used a single factor randomized block design with 84 lines and two control varieties as treatments. IPB200-F-42 is the only one line which had significantly higher yields than Inpari 32 (4.58 tons ha-1) with a productivity of 7.16 tons ha-1, but was not significantly different from Ciherang (5.21 tons ha-1) based on statistical analysis. Nonetheless, there are lines that tend to have higher productivity than the control varieties based on the average value and have agronomical characteristics according to the PTB criteria. These lines are IPB200-F-2, IPB200-F-14, IPB200-F-15, IPB200-F-17, IPB204-E-6, IPB200-F-21, IPB200-F-22, IPB200-F-25, IPB204-E-10, IPB201-F-16, IPB200-F-43, IPB200-F-44, IPB187-F-40-1-1.
Keyword: genotype, new plant type of rice, productivity, selection

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology