Judul: Kultur antera dan evaluasi galur haploid ganda untuk mendapatkan padi gogo tipe baru
Abstrak: Laju peningkatan produktivitas padi di Indonesia telah melandai (levelling off), artinya teknologi budidaya apapun yang diberikan sulit untuk meningkatkan produksi karena potensi genetik produksinya sudah jenuh. Oleh karena itu, diperlukan varietas unggul yang berdaya hasil tinggi melebihi daya hasil varietas yang sudah ada. Cara memperoleh varietas unggul tipe baru secara konvensional memerlukan waktu yang lama (7-10 tahun), terutama proses seleksinya sampai diperoleh galur murni. Pemanfaatan bioteknologi seperti kultur antera diharapkan mampu mempersingkat perolehan galur murni dan proses seleksi sehingga dapat menghemat tenaga, waktu dan biaya. Tujuan dari penelitian ini adalah: (1) mendapatkan galur padi haploid ganda homozigos, (2) mendapatkan informasi tentang kendali genetik terhadap karakter agronomi yang menunjang pembentukan padi gogo tipe baru, dan (3) mendapatkan genotipe yang berpotensi sebagai galur padi gogo dan galur padi gogo tipe baru.
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Judul: Uji Daya Hasil Lanjutan Galur-galur Padi Hasil Mutasi dan Kultur Antera.
Abstrak: Peningkatan produksi padi dapat dilakukan dengan memanfaatkan lahan suboptimal terutama lahan kering untuk padi gogo. Program pemuliaan untuk mendapatkan varietas padi toleran kekeringan dan produksi tinggi perlu mendapat prioritas agar peningkatan produksi dapat terwujud. Penelitian ini bertujuan untuk menguji potensi galur-galur padi hasil mutasi dan kultur antera dibandingkan dengan varietas padi berproduktivitas tinggi. Penelitian dilaksanakan di Kebun Percobaan Sawah Baru, Dramaga, Bogor dan di Kec. Cikembar, Sukabumi pada bulan November 2016 - Maret 2017. Penelitian ini menggunakan rancangan kelompok lengkap teracak (RKLT) dengan perlakuan berupa 20 galur uji serta dua varietas pembanding yaitu IR64 dan Inpago 10 dengan tiga ulangan. Hasil penelitian menunjukkan sepuluh galur yaitu E-4-CK1-BP, E-8-CK1-BP, E-16-CK1-BP, E-33-CK1-BP, E-38-CK1-BP, E-43-CK1-BP, E-48-CK1-BP, HR-5-7-1-1, HR-5-9-1-1 dan HR-6-5-1-3 terseleksi dengan karakter agronomi unggul dan potensi hasil yang relatif lebih tinggi dibandingkan IR64 dan Inpago 10.
Keyword: dihaploid, karakter agronomi, padi gogo, produktivitas

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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