Judul: Introduction marker gene serin Green Fluorescent Protein (sGFP) to Pyricularia grisea Rases 001 and 173 using Agrobacterium tumefaciens
Abstrak: Pyricularia grisea (teleomorf: Magnaporthe grisea) is causal agent of rice blast disease. Dominant races of P. grisea attacking rice in Indonesia is 001 and 173 races. Race 001 have low level of virulence but the ability to survive in the field is very high, while the 173 race have high level of virulence, but the ability to survive in field is low. GFP gene has been successfully used as amonitor for a blast disease caused by P. grisea. Therefore, GFP gene could be used to monitor the pathogenesis of both races. Introduction of serin GFP (sGFP) gene into spores of P. grisea by using A. tumefaciens- mediated transformation. sGFP gene has been introduced into A. tumefaciens LBA 4404 by triparental mating. Pyricularia grisea-sGFP was selected using selection medium that contains 300 μg/ml hygromycin. Transformation results shown P. grisea 001 races-sGFP transformant and P. grisea 173 races-sGFP transformant were not different with non-transformant on growth rate. To determine the insertion of sGFP gene into genome of P.grisea was detected by using PCR method with specific primer for sGFP. The result shown that amplification of sGFP gene was successfully and thus indicated that P.grisea 001 races-sGFP and 173 races-sGFP contained sGFP gene.
Keyword: Pyricularia grisea Rases 173, Pyricularia grisea Rases 001, sGFP, A tumefaciens-mediated transformation

Judul: Resistance Test toward of 48 Lines Rice to Blast Disease (Pyricularia oryzae) Race 001
Abstrak: Blast disease, caused by Pyricularia oryzae Cav., is one of the major fungal diseases infected rice (Oryza sativa L.) in Indonesia. The aim of this research was to examine the resistance of rice from the infection of P. Oryzae race 001 and to detect the existance of Pi-ta gene in resistant lines of rice. Resistance evaluation to blast disease (Pyricularia oryzae) on Cisadane (resistant), Kencana Bali (susceptible) as control, and 48 lines of rice was carried out in the green house by using injection inoculated method with P. oryzae race 001. Rice seedling were planted on sterilize soil, and sixteen days old of rice were soaked in the fungal spore suspension (105 spores/ ml) in the dark for 24 hours, and moved to the light. Rice disease was observered on 7-9th days after infection. There were 2 step screening of blast-resistant, which screening I performed a total of three replicates and screening II performed from selected plant in screening I a total of two replicates for each line of rice, with 10 plants in each replication. The result of second screening at green house showed that 13 lines resistant to P. oryzae 001 were IPB140-F-2-1, IPB115-F-4-2-2, IPB113-F-2-2, IPB107-F-7-3, IPB140-F-5, IPB149-F-2, IPB149-F-8, Martapura, IPB149-F-4, IPB149-F-5, IPB113-F-1, IPB102-F-92-1-1, IPB107-F-5-1 with the percentage of resistance ≥ 80 %. Two pairs of DNA primers specific to the dominant indica Pi-ta gene were designed from DNA sequence in gene bank with accession number AF207842 to amplify the Pi-ta DNA fragments by polymerase chain reaction (PCR) method. The results revealed that all of 13 resistant and 2 susceptible lines (IPB107-F-18-4-2 and IPB107-F-16E-6) of rice carrying Pi-ta genes, even in Kencana Bali. The previous experiment shown that Kencana Bali does not have Pi-ta resistance gene. It is expected that Kencana Bali has deletion of Pi-ta resistance gene in the end part of exon 2. Further more, those results also indicated that Pi-ta gene did not confer resistance to race 001 of Pyricularia oryzae. Resistance to P. oryzae race 001 might be controlled by different resistant gene.
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Judul: Kestabilan Kesetimbangan Model Cournot
Abstrak: Pasar oligopoli merupakan pasar yang terdiri atas sedikit penjual (Iebih dari satu) pada sisi penawaran dan ban yak pembeli pada sisi permintaan. Pasar oligopoli dengan dua perusahaan disebut pasar duopoli. Setiap penjual diasumsikan bertujuan untuk memaksimumkan laba. Besamya laba yang diperoleh oleh seorang penjual bergantung pada banyak hal, di antaranya pada harga dan strategi yang dipilihnya. Pada pasar oligopoli model Coumot, pemilihan tingkat output atau harga merupakan strategi yang dapat dipilih oleh penjual untuk memaksimumkan laba.
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