Judul: Seleksi padi hibrida terhadap kekeringan untuk pengembangan di lahan sawah tadah hujan
Abstrak: The objective of the research was to determine method and character for early selection of rice to drought and to obtain drought tolerant hybrid rice genotypes to be used further in rainfed lowland. Experiments were conducted from April 2011 until July 2012 at Seed Science and Technology Laboratory, IPB and BB Biogen greenhouse Cimanggu, Bogor, at Babakan Experiment Station, IPB, Bogor, and at irrigated lowland, Cikembar, Sukabumi, and rainfed lowland, Gantar, Indramayu. The study consisted of seven experiments. The results showed that: (1) Polyethylene glycol (PEG) 6000 could detect and differentiate the response of hybrid rice genotypes to drought stress in both germination and seedling stage. The use of 25% PEG 6000 in the seedling stage could detect early hybrid rice genotypes tolerant to drought and have a compatibility with grouping of genotypes tolerant to drought based on yield criteria in the field. Variables of root dry weight, shoot dry weight and leaf dryness score were to detect hybrid rice genotypes tolerant to drought at seedling stage. (2) Genotypes BI485A/BP12, BI485A/BP15 and BI559A/BP15 under drought stress conditions decreased root length less (17.6 - 26.9 percent) than the IR64, the sensitive check variety (33.6 percent). Their grain weight, harvest index and grain yield (2.82, 2.58 and 2.72 ton ha-1) were higher than other genotypes. Moreover they were earlier to harvest, shorter in grain filling period and had sensitivity index to drought ≤ 0.50. Hybrid genotype tolerant to drought i.e BI599/BP15 under drought stress conditions had less stomatal density, maintained higher leaf relative water content, and contained non-structural carbohydrates in stem, sheath and leaf less than other genotypes. Genotypes BI485A/BP12, BI485A/BP15 and BI559A/BP15 were tolerant to drought and potentially could be developed for rainfed lowland; (3) The yield of these genotypes under irrigated lowland were not significantly different from those of Ciherang and Hipa 7 (i.e. 5.63, 6.87 and 6.30 ton grain ha-1, respectively). BI599A/BP15 genotypes under severe drought at rainfed lowland yielded 0.90 ton grain ha-1, whereas Hipa 7 and Limboto reached 0.34 and 0.29 ton grain ha-1, respectively.
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Judul: In vitro Selection For Drought Resistance On Rice
Abstrak: The rice demand is recently increasing , on the other hand the production is decreasing. It is caused by the long dry season due to the seasonal change. In addition, a lot of productive land has changed into industrial and settlement which in return minimize the number of productive land. To overcome this 2 varients with high yield and drought-stress resistant as in IR 64 variety should be produced. In this attemt, mutative induction combined with in vim culture and in vitro selection on the Gajahmungkur, Topwuti and IR 64 variants has been conducted and has yielded several somaclones which show the genetic variation. Through evaluation and characterization for the drought resistant using PEG 20% (BM 6000), several somaclone assumed to be drught resistant have been obtained. Subsequently, to find , out the mechanisme of the respective genotype toward the drought stress resistance, root penetration and proline content analysis at the somaclone have been $ conducted. From the evaluation, 23 Gajah mungkur somacloncs, 9 Towuti somaclones and 13 Ir 64 somaclones have been obtained as the ones with the high proline content. The drought stress treatment to the assumed drought stress resistent it is obtained 9 somaclones from Towuti, 5 from Gajahmungkur and 8 from IR 64 with the better characteristics under drought test than that of the main plants. Shorter plant with more shoots are obtained from Gajahmungkur but the seeds ripe earlier. From Tohti variants, more shoots and higher plants along with the more grain are obtained. From variety of IR 64 , somaclone which can produces seeds during the drought is obtained, meanwhile this does not happen with the plant originated from seed. The plants resulted from the selection produce more qualified shoot and grain than that of the main plants.
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Judul: Pelabelan Super Vertex Magic
Abstrak: Super vertex magic labeling is labeling on graph with is a set of edges mapped into and is a set of vertices mapped into . It has a vertex magic labeling in which and represents the size and order of the graph respectively. This manuscript proves that paths, cyclics, and disjoint union of cyclics have a super vertex magic labeling. There are four theorems to be discussed. The first theorem proves that path is super vertex magic if and only if is odd and . The second theorem proves that cyclic is super vertex magic if and only if is odd. The third theorem proves that bijection function from an edge set onto of graph can be extended to a super vertex magic labeling if and only if the set amount of edge label that incidents with a vertex in the graph, consists of sequential integers as many as vertices in the graph. The fourth theorem proves that disjoint union of the cyclics consists of cyclics with each cyclic has vertices is super vertex magic if and only if and are odd.
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