Judul: Uji stabilitas galur-galur padi gogo hasil kultur
Abstrak: The objective of this research was to study the adaptation and yield stability of upland rice lines obtained from anther culture. Ten lines of upland rice obtained from anther culture and two check varieties (Way Rarem and Batutegi) were evaluated for their potential yield in seven different locations in the rainy season 2010/2011 and 2011/2012. In each location, the design was Randomized Complete Block Design with four replications. The method of Francis & Kannenberg, Finlay & Wilkinson, Eberhart & Russel, and AMMI (Additive Main Effect Multiplicative Interaction) were used to analyze the adaptation and yield stability. WI-44 line achieved the highest yield average (4.88 ton ha-1), higher than Batutegi and not significantly different from Way Rarem and has the highest potential yield (10.28 ton ha-1) in Malang in the second season. IW-67 yielded an average of 4.53 ton ha-1, not significantly different from Batutegi and has potential yield (9.09 ton ha-1) in Malang in the second season. WI-44 line has a superior yield average in seven environment. WI-44, IW-67 and IW-56 lines have an ability to adapt in optimal environments. I5-10-1-1, GI-7 and O18-b-1 were adapted in the marginal environments with yield above the average of the genotype tested.
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Judul: Analysis of yield stability and performance of upland rice lines obtained from anther culture
Abstrak: The objectives of this research were to study the potential and yield stability of upland rice lines obtained from anther culture and their performance in the field. Ten upland rice doubled-haploid (DH) lines were tested for their potential yield in eight different locations (in Provinces of Lampung, West Java, Central Java, Yogyakarta, East Java - Indonesia) in the rainy season of 2010/2011 along with two check varieties (Way Rarem and Batutegi). In each location, the design was Randomized Complete Block Design with four replications. The results indicated that the line showing the most stable yield in different environment was I5-10-1-1 followed by WI-44, and IG-38. I5-10-1-1 produced 4.01 tons of dry grain per hectare. The line showing the highest yield was WI-44, and this line produced 4.72 tons of dry grain per hectare. Visualization with AMMI showed that IW-56 and IW-67 lines were specifically adapted in Purworejo, O18-b-1 was specifically adapted in Bogor, and IG-19 was specifically adapted in Malang.
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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