Judul: Pengaruh Perlakuan Asam Askorbat dalam Meningkatkan Toleransi Kekeringan pada Dua Varietas Padi Gogo (Oryza sativa L.)
Abstrak: The aimed of this research was to examine the effects of ascorbic acid treatment to improve drought tolerance of two varieties of upland rice growth under drought stress. The laboratory works consisted of two experiments and were designed to determine the critical osmotic potential of upland rice and to determine the optimum ascorbic acid concentration. The greenhouse study was designed to examine the effects of soaking seed in ascorbic acid on seedling growth under drought stress. Drought condition was simulated by PEG-6000 and regulation of water treatment. During the first experiment,osmotic potential was significant at all variables but varieties and interactions of both osmotic potential and varieties were no significant at all variables. Germination percentage and speed of germination were significantly decreased by increasing of osmotic potential. The second experiment showed that interactions of both factors were no significant at all variables. The result showed that the ascorbic acid treatment only improved the germination percentage and speed of germination compare the control. However, the best result was showed by 55 mM ascorbic acid. The result of green house experiment showed that the interactions were no significant except on leave wide and water deficit 1 WAP. Ascorbic acid treatment was no effect at all variables.
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Judul: Physiological characteristic of local upland rice from Southwest Sumba Regency under various drought stress conditions
Abstrak: Cekaman kekeringan merupakan salah satu faktor abiotik yang sangat berpengaruh terhadap produktivitas padi. Besarnya penurunan hasil panen akibat cekaman kekeringan dipengaruhi oleh tingkat kepekaan varietas. Penelitian ini bertujuan mengetahui pengaruh berbagai perlakuan cekaman kekeringan terhadap respons fisiologi tumbuhan padi gogo lokal (Gogo Wangi) asal Kabupaten Sumba Barat Daya. Padi Gogo Wangi diberi perlakuan cekaman kekeringan dengan penyiraman 1/2 Kapasitas Lapang (KL) dan 1/4 KL. Sebagai kontrol, padi Gogo Wangi diberi penyiraman dengan 1 KL. Parameter yang diamati adalah komponen karakter vegetatif dan reproduktif, kadar air relatif (KAR), kadar prolin, dan kandungan asam askorbat (ASA) daun. Hasil menunjukkan bahwa cekaman kekeringan menurunkan nilai KAR daun yang berakibat kadar prolin dan kandungan ASA daun meningkat. Cekaman kekeringan juga mempengaruhi tinggi dan bobot kering tajuk, panjang dan bobot kering akar, serta umur berbunga dan panen kedua varietas padi. Namun, cekaman kekeringan tidak mempengaruhi jumlah anakan per rumpun, jumlah daun, jumlah anakan produktif, panjang malai, dan jumlah biji per malai., Drought stress is one of the abiotic factors that decreasing of upland rice productivity. The decreased crop due to drought stress is affected by sensibility level of varieties. The objective of the study was to evaluate physiological responses of local upland rice (Gogo Wangi) from Southwest Sumba Regency under various drought stress conditions. The condition treatments consisted of control with 1 Land Capacity (LC), 1/2 LC, and 1/4 LC watering volume. Observed parameters were vegetative and reproductive characters, leaves relative water content (RWC), proline, and ascorbic acid density. The results showed that drought stress decreased the value of RWC leaves resulting levels of proline and ascorbic acid in leaves increased. Drought stress also significantly affected canopy height and dry weight, root length and dry weight, and days to flower and harvest of two rice varieties. However, drought stress did not affect number of tillers per hill, number of leaves, number of productive tillers, panicle length and number of grains per panicle. Keyword: ascorbic acid, drought stress, local upland rice, proline, Sumba
Keyword: asam askorbat, padi gogo lokal, kekeringan, prolin, Sumba

Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. Suatu graf lengkap berorder 𝑛������ ≥ 3 dan graf r-regular berorder 𝑛������ ≤ 2𝑟������ + 1 merupakan graf Hamilton, Karena kedua graf tersebut memuat cycle Hamilton. Selanjutnya, syarat cukup tersebut digunakan untuk menentukan keberadaan cycle Hamilton pada graf 2-connected 4- regular berorder kurang dari 10.
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular