Judul: Ketahanan terhadap hawar daun bakteri dan keragaan produktivitas padi sawah yang ditanam tunggal dan campuran
Abstrak: The core of Indonesian agricultural development policy is to meet the demand of rice as staple food. The improved varieties which have been used still faced constraints such as abiotic and biotic stress. One of the important biotic stress is Bacterial Leaf Blight disease caused by Xanthomonas oryzae pv. oryzae. According to the previous research, mixture varieties planting could reduce disease intensity and increase the yield. The aim of this research was to find out the genotype that resistance to BLB, yield stability, genetic variability and other characters stability on single and mixture planting. The experiment used 17 genotypes as treatments which consisted of 7 cultivars and 10 cultivar mixtures with different resistance to BLB background. The trial was designed in Randomized Complete Block Design and replicated three times. The trial was conducted during two seasons in Majalengka and Pacitan. The characters observed were Bacterial Leaf Blight spreading, plant height, number of panicle per hill, number of well-filled grain per panicle, number of unfilled grain per panicle, number of total grain per panicle, 1000 grains weight, well-filled grain percentage, yield per ha and sink size. The disease spreading data was used to analyze the first appearance of disease, disease incidence, disease severity and Area Under Disease Progress Curve (AUDPC). The yield data was used to analyze yield stability and genetic parameters, while agronomic characters data was used to analyze the difference between two seasons and between single and mixture genotype using t test. According to the result of analysis, there was no difference between single and mixture genotype on the first appearance of disease, disease incidence, disease severity and AUDPC. The result of combine and stability analysis showed that genotype, season and their interactions influenced the yield; and the stable, unstable and specific single and mixture genotype could be determined. According to t test to other characters, there was no difference between single and mixture genotype. Based on the result of the analysis, the effect of mixture to reduce the Bacterial Leaf Blight disease and to increase the yield has not been known yet.
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Judul: Uji Daya Hasil Dan Ketahanan Terhadap Penyakit Hawar Daun Bakteri Tanaman Padi Hibrida.
Abstrak: Tanaman padi hibrida sebagai salah satu alternatif untuk meningkatkan produktivitas lahan sawah. Dari hasil penelitian telah ditemukan sejumlah hibrida berheterosis tinggi dari galur mandul jantan tipe Wild Abortive dan tipe Kalinga yang tahan terhadap penyakit hawar daun bakteri patotipe III, IV dan VIII. Padi hibrida dan galur mandul jantan dengan dua sumber sitoplasma perlu diuji lebih lanjut pada skala yang lebih besar untuk mengidentifikasi genotipe yang resisten terhadap penyakit hawar daun bakteri.Tujuan dari penelitian ini adalah untuk mendapatkan informasi penampilan karakter agronomi, ragam genetik, tipe daun bendera, eksersi malai dan nilai repeatabilitas. Percobaan pertama adalah uji daya hasil genotipe-genotipe harapan padi hibrida di Indramayu dan KP Muara pada bulan November 2013 hingga bulan Maret 2014. Rancangan yang digunakan adalah Rancangan Kelompok Lengkap Teracak (RKLT) dengan genotipe sebagai faktor tunggal dan terdiri atas 3 ulangan di tiap lokasi. Perlakuan terdiri atas 17 genotipe padi hibrida dan tiga varietas pembanding. Karakter yang diamati adalah tinggi tanaman, jumlah anakan vegetatif, jumlah anakan produktif, panjang malai, umur berbunga, umur panen, jumlah gabah total per malai, persen gabah isi per malai, persen gabah hampa per malai, bobot 1000 biji dan produktivitas. Percobaan kedua bertujuan untuk menguji ketahanan terhadap penyakit hawar daun bakteri di rumah kaca. Bahan tanam yang digunakan adalah 20 genotipe yang sama seperti percobaan pertama. Rancangan yang digunakan dalam penelitian ini adalah Rancangan Kelompok Lengkap Teracak (RKLT) dua faktor, yaitu genotipe dan hawar daun bakteri patotipe (IV dan VIII) dengan tiga ulangan. Berdasarkan hasil analisis, terdapat pengaruh genotipe yang nyata diantara beberapa karakter agronomi yang diamati. BI485A/BP1(IR53942) memiliki potensi hasil rata-rata 5.8 ton/ha. Jumlah anakan produktif pada genotipe BI485A/BP1(IR53942) termasuk kategori sedang (8-15 batang), persen gabah isi 90.36%, bobot 1000 butir 27.98 g, dan memiliki eksersi malai yang keluar sempurna. Karakter agronomi dari genotipe yang diuji pada umumnya mempunyai koefisien keragaman genetik, koefisien keragaman fenotip, dan repeatabilitas yang rendah. Repeatabilitas yang tinggi terdapat pada karakter umur berbunga. Terdapat sembilan genotipe yang terindikasi tahan terhadap penyakit hawar daun bakteri yang ditanam pada lokasi Indramayu. Dari hasil penelitan kedua, genotipe yang menunjukkan reaksi agak rentan terhadap penyakit hawar daun bakteri di rumah kaca adalah 29A/H12 pada patotipe IV dan Hipa 6 Jete pada patotipe VIII.
Keyword: daya hasil, hawar daun bakteri, padi hibrida

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