Judul: Character Diversity of Rice Seed Populations RIL Generation F9 Derived from Crossbreeding of Cultivars IR64 and Hawara Bunar
Abstrak: Padi (Oryza sativa L.) adalah tanaman pangan penting bagi penduduk di Indonesia. Meningkatkan produksi padi sangat penting untuk ketahanan pangan nasional. Di antara karakter padi yang dapat mempengaruhi produktivitas padi adalah bentuk dan ukuran biji. Penelitian ini bertujuan untuk menganalisis keragaman dan korelasi karakteristik biji padi populasi recombinant inbred lines (RILs) generasi F9 hasil persilangan kultivar IR64 dan Hawara Bunar. Metode yang dilakukan adalah penanaman padi di sawah, pemindaian biji padi, pengukuran dan pengamatan karakter biji padi. Hasil penelitian menunjukkan bahwa karakter biji dari 256 galur berbeda signifikan antar galur sehingga dapat mengelompokkan galur-galur tersebut menjadi empat kelompok utama. Analisis korelasi antar karakter pada gabah menunjukkan korelasi positif yang sangat nyata antara lebar gabah dengan panjang perimeter gabah dan rasio panjang terhadap lebar gabah. Karakter beras juga menunjukkan korelasi positif yang nyata antara karakter panjang perimeter beras dengan panjang beras dan luas area beras. Karakter biji dapat menjadi karakter pembeda pada 256 galur RIL., Rice (Oryza sativa L.) is an important staple food crop in Indonesia. Increasing rice production is crucial to maintain national food security. Among the rice characteristics that affect productivity are the shape and size of the seeds. The study aimed to analyze the diversity and correlation of seed characteristics in recombinant inbred lines (RILs) population of F9 generation derived from a cross between rice cv. IR64 and Hawara Bunar. Rice plants were cultivated in the paddy field and the seeds were harvested, scanned, observed, and measured the characteristics. The data was statistically analyzed using R software. The results showed that the grain characteristics of the 256 lines were significantly different among the lines and could group the lines into four main groups. Correlation analysis of grain character showed highly significant positive correlations between grain width and grain perimeter length, as well as the length-to-width ratio of the grain. The seed characteristics also exhibit a significant positive correlation between the length of the grain perimeter, seed length, and seed area. The seed characteristics can be used as a marker among the 256 RIL lines.
Keyword: beras, Hawara Bunar, IR64, korelasi, RILs, correlation, rice

Judul: Evaluation of 100 Lowland Rice Lines (Oryza sativa L.) in F3 Generation of IPB196 population
Abstrak: Lahan pertanian semakin menyempit dan jumlah penduduk semakin bertambah, sehingga perlu pemuliaan tanaman untuk mengatasi hal tersebut. Penelitian ini bertujuan menguji keragaman keragaan 100 galur padi generasi F3 populasi IPB196. Penelitian dilaksanakan di Kebun Percobaan Sawah Baru IPB, Desa Babakan, Dramaga, Bogor pada Februari sampai Agustus 2022. Penelitian ini menggunakan rancangan augmented design dengan menggunakan rancangan lingkungan rancangan kelompok lengkap teracak (RKLT). Digunakan dari 6 pembanding, yaitu dua variets (Ciherang, Inpari32) dan 4 galur padi tipe baru (PTB) ((IPB187-F-37-1-2 (S1), IPB187-F-65-1-2 (S3), IPB193-F-30-2-1 (S9), dan IPB187-F-40-1-1(T5)) dengan 5 ulangan, serta genotipe yang diuji berjumlah 100 galur generasi F3. Karakter panjang batang memiliki kisaran 59,76-88,91 cm dengan kisaran jumlah gabah total per malai 110,35-202,15 g, jumlah anakan antara 4-20 anakan, serta bobot gabah per rumpun berkisar 12,34-62,33 g. Keragaman semua karakter yang diamati termasuk kedalam keragaman sempit dan penampilan yang seragam, ditunjukkan dengan nilai koefisien keragaman genetik (KKG) dan koefisien keragaman fenotip (KKF) yang rendah. Hasil penelitian menunjukkan terdapat sebelas galur menghasilkan bobot gabah per rumpun antara (35,96-62,33 g, lebih tinggi) dari pembanding VUB (23,71 g dan 29,36 g) dan pembanding galur PTB (37,18–38,94 g)., Agricultural land decreases while the population is increasing, so plant breeding is needed to overcome this. This study aims to evaluate the variation performance of 100 F3 lowland rice of the IPB196 population and study their variation, as well as to select the best lines that have high yield potential. The research was carried out at the IPB196. Experimental Farm in Sawah Baru, Babakan Village, Dramaga, Bogor from February to August 2022. This study used an augmented design using a randomized complete group design (RKLT). Six checks are used for two varieties (Ciherang and Inpari32) and four lines of a new rice plant type (NPT) (IPB187-F-37-1-2 (S1), IPB187-F-65-1-2 (S3), and IPB193-F-30-2-1 (S9)), the total number of genotypes evaluated is 100 F3 generations with five replications. The stem length characters ranged from 59.76, to 88.91 cm, with total grain numbers per panicle ranging from 110.35, to 202.15 g, and tillers ranging from 4 to 20. The weight of grain per clump ranges from 12.34 to 62.33 g. The variation of all observed characters belongs to narrow variation and has a uniform appearance, as indicated by low genetic variation coefficient and phenotypic variation coefficient values. The results showed that there were eleven lines that had to produce higher grain weights per clump (from 35.96 to 62.33 g, higher). The VUB check (23.71 g and 29.36 g) and the NPT lines check (37.18 to 38.94 g).
Keyword: line, new plant type of rice, productivity

Judul: Pembuatan Film Tipis Cu2ZnSnS4 sebagai Lapisan Penyerap Cahaya pada Sel Surya Menggunakan Metode Elektrodeposisi
Abstrak: Thin film of Cu2ZnSnS4 (CZTS) is an alternative semiconductor used as light absorber layer on solar cell. CZTS can replace silicon that commonly used as commercial semiconductor. The advantage of using CZTS as absorber layer is due to the abundance of its chemical composer on earth, and its high value of absorption coefficient. The absorber layer was made by using electrodeposition method on ITO glass substrates. The films were deposited at room temperature using potentiostatic mode with a potential of –1.05 V for 30, 45, and 60 minutes. After that, the films were annealed at two different temperatures, 180 ºC and 500 °C, for 45 minutes in N2/H2S atmosphere. Based on X-ray diffraction analysis, the polycrystalline thin film obtained fall into kesterite crystal phase. This type of crystal was obtained when the CZTS was annealed at 500 °C in H2S/N2 atmosphere. The value of optical band gap energy for the CZTS thin film was 2.2 eV with the film thickness about 1.228–6.366 μm. The sample of CZTS with electrodeposition time of 45 minutes and annealing temperature of 500 °C showed the best result and in conformity with absorber layers criteria for solar cells.
Keyword: semiconductor, ITO glass, CZTS thin film, electrodeposition