Judul: Induksi Pembelahan Sporofitik Mikrospora Kedelai Melalui Kultur Antera Pada Sistem Media Dua Lapis
Abstrak: Pemuliaan kedelai masih dilakukan secara konvensional, yaitu dengan cara menyilangkan antar varietas yang dilanjutkan dengan proses seleksi untuk menghasilkan varietas baru. Proses ini membutuhkan waktu yang lama, khususnya dalam proses seleksi untuk memperoleh galur-galur yang stabil secara genetik, yaitu 7-8 generasi. Untuk itu diperlukan introduksi teknik untuk mempercepat stabilitas genetik dari suatu hasil persilangan. Salah satu alternatif untuk mempercepat stabilitas genetik adalah teknologi haploid melalui induksi androgenesis untuk embriogenesis.
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Judul: Cekaman Suhu Untuk Induksi Pembelahan Sporofitik  Pada Kultur Antera Kedelai Dalam Sistem Media Dua Lapis
Abstrak: Teknik androgenesis sangat berpotensi untuk mempercepat proses penelitian dan pemuliaan pada tanaman kedelai. Pengembangan teknik androgenesis pada kedelai melalui kultur antera pada media padat dan kultur isolasi mikrospora pada media cair belum dapat mengembangkan metode yang efisien. Penelitian ini bertujuan untuk mempelajari tahap awal induksi androgenesis kultur antera kedelai varietas Sindoro dan Slamet dalam sistem media dua lapis. Penanda morfologi kuncup bunga kedelai untuk sebagian besar mikrosporanya berinti tunggal akhir sampai berinti dua awal adalah ketika rasio braktea terhadap panjang kuncup 2:3. Perlakuan cekaman suhu rendah (4-9 °C) selama tiga hari dan suhu tinggi (31-33 °C) selama tujuh hari pada awal periode inkubasi dapat menginduksi pembelahan sporofitik sampai menjadi struktur multiselular pada varietas Slamet umur kultur empat minggu. Induksi pembelahan sporofitik dapat terjadi dari mikrospora berinti tunggal akhir sampai berinti dua awal. Hasil penelitian ini mengindikasikan bahwa tahap awal androgenesis telah dapat diinduksi melalui kultur antera kedelai dalam sistem media dua lapis.
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Judul: Characteristic of Overshooting Top (OT) Based on  Himawari  8  Satellite  as  a  Convective  Cloud  Feature  that  Generates  Extreme Weather in the Java Island Region
Abstrak: Overshooting Top (OT) is a feature at the top of a convective cloud that is associated with extreme weather. Research on OT in tropical Indonesia is still very limited. The existence of geostationary satellites with wide area coverage and fast frequency observations is useful for observing the fast dynamics of the OT life cycle. Therefore, this study intends to analyze the relationship between OT and extreme weather, updraft and thermodynamic conditions of OT when extreme weather occurs, the best objective method for detecting OT in the day time and night time, and the spatiotemporal distribution of OT in the tropical region of Java Island during the 2018-2021 period. Based on visual analysis using visible channel and Himawari 8 sandwich products, 87% of extreme weather events in Java were accompanied by the appearance of OT. It indicates that the presence of the OT pattern is a convection cloud pattern or feature that is closely related to extreme weather events for the Java Island region. The existence of a time lag between the appearance of OT and extreme weather events on Java Island indicates that the OT of convection cloud can be used as a precursor or nowcasting for the appearance of extreme weather. Most of the convective cloud OT features during extreme weather events on Java Island have altitude that were only able to exceed the altitude of the equilibrium level and few were able to exceed the tropopause level of 9 km – 16 km. The difference in atmospheric conditions during extreme weather events on Java Island, which is in the tropics and subtropics, is a strong and unstable convective energy condition characterized by a larger CAPE, as well as unstable KI, LI, SI and TTI values. It is offset by kinematic factors in the form of a weak vertical wind shear (bulk wind shear 0-6 km) and a higher freezing point height. The difference between extreme weather events in the Java Island region and other tropical regions compared to subtropical regions is the strong updraft speed of convection clouds. The IRW Texture COMB algorithm based on the IRW-Texture Gradient modification and the COMB algorithm shows a significant increase in quality for detecting OT and non-OT pixels in Java. Rainy days with rainfall > 50 mm/day are very common in areas with an altitude of > 500 m. On the other hand, the level of convection activity which is indicated by the presence of OT and lightning is significantly reduced in this area. OT of convective clouds appear more frequently during the DJF season and less frequently during the JJA season. OT often appears during the day time and rarely at night time. Most OTs appear in the central part, away from the south and north coasts of Java Island during the day, while OTs that appear near the south and north coasts of Java Island can appear in the morning or afternoon.
Keyword: convective clouds, extreme weather, Overshooting Tops, Himawari 8 Satellite