Judul: Resistance Response Of Ten Ridged Gourd (Luffa Acutangula (L.) Roxb.) Cultivars Against Squash Mosaic Comovirus Infection
Abstrak: Squash mosaic comovirus (SqMV) is one of the important viruses infecting cucurbits including ridged gourd. The data related resistance response to SqMV of this plant species is not available yet. Thus, the aim of this research was to evaluate the resistance response of commercial ridged gourd cultivars against SqMV infection. Ten commercial cultivars were tested by inoculating SqMV mechanically. Incubation time, type of symptom, disease incidence, severity and virus titre were recorded as well as agronomic characters. The earliest symptom appearance was present on Essenza cultivar and the latest one on Anggun F1 cultivar with incubation time ranged from 3.1 to 4.4 days post-inoculation. The infected plants showed mild to severe mosaic symptom depend on cultivars with severity score ranged from 2.20 to 3.57 and disease incidence up to 100%. Essenza cultivars had the highest viral titre and Anggun F1 had the lowest one. The infected plants showed reduction of plant growth, number of flowers, fresh and dry weight compared with healthy plants. Based on thosevariables, Hebata, Estilo, Azura F1 and Essenza cultivars are classified as very susceptible, while Jaka F1, Mahkota, Bidara, and Grandia F1 cultivars are susceptible, and Anggun F1, and Prima F1 cultivar are tolerant against SqMV infection.
Keyword: Cucurbitaceae, resistance, ridged gourd, SqMV

Judul: Pengaruh Infeksi Squash mosaic comovirus Terhadap Perkembangan Penyakit Mosaik pada Lima Varietas Mentimun (Cucumis sativus L.)
Abstrak: Squash mosaic comovirus (SqMV) is seed borne pathogens that infect many Cucurbitaceae crop, its presence has expanded in Indonesia. This research aims to 1) know the percentage of SqMV carried by seed on five varieties of cucumber are Jupiter, Venus, Japan File, Vario, and Calista, 2) determine the influence SqMV infection on the mosaic disease development, and 3) determine the effect of SqMV infection to the percentage of SqMV carried by the next generation seeds. Five varieties of cucumbers mechanically inoculated with SqMV then observed symptoms, incubation period, and the incidence of disease. Seed borne virus testing performed by the method of growing-on test. Virus detection used indirect ELISA method and DIBA. Based on testing of cucumber leave samples from Situgede, Bogor by using antisera Cucumber mosaic cucumovirus, Squash mosaic comovirus, Zucchini yellow mosaic potyvirus, Watermelon mosaic potyvirus, and Tobacco ring spot potyvirus known that SqMV is the only type of virus found with the highest titer reached 0.8155. Varieties Venus, Jupiter, Calista, and Vario which infected will show varied symptoms that is mosaic of green, yellow green mosaic, leaf bleaching bones, and malformations in fruit. Observations of disease severity and viral titers showed a pattern of mosaic disease development is decreased in the flowering stage and increased in the fruiting stage. In the vegetative stage, viral titers ranged from 1.3845 to 1.5603, viral titers of the flowering stage decreased, ranging from 0.8966 to 1.2780, and viral titers of the fruiting stage increased again, from 0.8849 to 1.4420. The Japan File gives a different response because the decrease in the severity of the disease continues to bear fruit since the flowering stage. Commercial seed (F1) which is widely used by farmers proved to bring SqMV achieve 100% efficiency and variety of Venus which infected by SqMV produce seed offspring (F2) which brings SqMV with efficiency reaches 60.87%.
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Judul: Sintesis 1-Kloro-2-metoksi-6-propilnaftalena-1,3-dioksolana (1:1) sebagai Prekursor Asam (S)-(+)-(6-Metoksi-2-naftil)propanoat
Abstrak: Senyawa 1-kloro-2-metoksi-6-propilnaftalena-1,3-dioksolana (1:1) sebagai prekursor asam (S)-(+)-(6-metoksi-2-naftil)propanoat disintesis dari bahan awal 2-metoksinaftalena. Tahapan sintesis diawali dengan klorinasi menggunakan 2 jenis pereaksi klorinasi, yakni isosianurat terklorinasi dan NaOCl. Klorinasi dengan isosianurat terklorinasi berhasil menyintesis 1-kloro-2-metoksinaftalena sebagai produk monoklorinasi melalui pencirian dengan kromatograf gas-spektrometer massa (GC-MS). Nisbah konversi produk paling efisien diperoleh pada laju penambahan 2.5 mmol/jam. Sebaliknya, klorinasi dengan NaOCl menghasilkan produk triklorinasi. 1-Kloro-2-metoksinaftalena selanjutnya diasilasi dengan propanoil klorida, tetapi analisis dengan GC menunjukkan bahwa produk asilasi tidak terbentuk. Sistem bebas-air diperlukan untuk keberhasilan proses asilasi tersebut.
Keyword: isosianurat terklorinasi, NaOCl, nisbah konversi