Judul: Multiplikasi menggunakan stek buku dan penggandaan  kromosom beberapa genotipe padi F1 interspesifik
Abstrak: Salah satu cara untuk memindahkan gen dari spesies padi liar ke varietas budidaya adalah dengan nlelakukan persilangan kerabat jauh (interspesific hybridizatrion)yang dilanjutkan silang balik dengan tetua padi budidaya Silang balik pertama dengan tetua berulangnya umumnya menghasilkan seed set yang sangat rendah. Dari 38 000 penyerbukan silang balik antara F1 ((llyza satlva x (3. mlnz4ta) dengan 0. sativa yang dilakukan, hanya dapat dihasilkan 7 tanaman Oleh karena itu diperlukan tanaman F1 yang sangat banyak.
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Judul: Studi Keragaman Galur Padi Generasi F4 Hasil Persilangan IR64 x Mekongga
Abstrak: Ketersediaan pangan yang cukup merupakan hal penting dalam upaya pemenuhan kebutuhan pangan. Pertambahan penduduk dan penyusutan lahan yang menjadi penyebab tingginya tingkat konsumsi beras di Indonesia. Varietas unggul hasil pemuliaan tanaman diharapkan mampu menjadi salah satu teknologi kunci dalam peningkatan produktivitas padi. Penelitian ini bertujuan untuk mengetahui keragaman sifat tanaman yang berkolerasi dengan hasil produksi pada populasi F4 dari hasil persilangan IR64 dan Mekongga di lahan kering dan membandingkannya dengan varietas pembanding. Penelitian dilakukan dengan menggunakan 100 galur F4 padi dan 4 varietas pembanding yaitu IR64, Mekongga, 6R dan 7R. Peubah yang diamati yaitu tinggi tanaman, jumlah anakan total, jumlah anakan produktif, panjang malai, jumlah gabah bernas, bobot gabah bernas, bobot gabah hampa, dan bobot 100 butir. Nilai heritabilitas yang tinggi dan koefisien keragaman genetik yang luas terdapat pada bobot gabah bernas sehingga dijadikan sebagai kriteria seleksi. Hasil seleksi menggunakan karakter bobot gabah bernas, diperoleh 20 galur terbaik yang diharapkan mampu mewarisi sifat baik yang dimilikinya pada generasi F5.
Keyword: heritabilitas, keragaman genetik, seleksi, varietas unggul

Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
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