Judul: Karakter Reproduktif Gandum (Triticum aestivum L.) Sensitif Suhu Tinggi pada Aplikasi Putresin di Dataran Sedang dan Tinggi
Abstrak: Wheat (Triticum aestivum L.) is originated from subtropic area. Cultivating wheat in Indonesia faces high temperature stress. Putrescine application may be used to overcome the problem. The objective of this research was to study the effect of putrescine and wheat genotype to the reproductive characters of wheat that were planted in medium (Cisarua) and high (Cipanas) altitudes. The experiment was a factorial experiment with two factors. The first factor was putrescine concentration with 3 levels i.e, 0.0, 1.25, and 2.5 mM. The second factor was three wheat genotypes consisted of Dewata, Munal, and S-03. Putrescine did not affect wheat growth and production. In Cipanas, wheat genotype also affected several reproductive characters, i.e: flowering age, the angle of inflorescence, harvesting time, length of panicle, number of spikelet, number of floret, number of empty floret, and weight of seed per panicle. In Cisarua, wheat genotype affected flowering age, the angle of inflorescence, harvesting time, length of panicle, number of spikelet, number of floret and number of empty floret per panicle. Genotype S-03 is the best genotype to be planted in Cipanas, whereas Dewata is the best genotype to be planted in Cisarua.
Keyword: Triticum aestivum L., sensitive temperature, putrescine, Character reproduktif

Judul: Karakter Morfologi dan Fisiologi Genotipe Gandum (Triticum aestivum L.) Introduksi Toleran Suhu Tinggi di Dataran Tinggi dan Sedang
Abstrak: Wheat (Triticum aestivum) is a member of Gramineae family originated from subtropical regions, that is consumed as a second food in Indonesia, but most of it are imported. Efforts to save foreign exchange from import of wheat is to develop wheat in Indonesia. Planting wheat in Indonesia is facing high temperature stress. Application of putrescine is expected to induce high temperature stress tolerance. This research aimed to study the morphological and physiological respons of two introducted wheat genotypes (Sbr and Astreb) that are tolerant to high temperatures under putrescine application. Wheat was planted in two locations: Cipanas (1100 m asl) and Cisarua (600 m asl) and then was observed the morphological (plant height, number of tillers, number of stomata; angles, thickness and flag leaf area) and physiological characters (chlorophyll content and transpiration rate) to evaluate the effect of 0, 1.25 and 2.5 mM putrescine application. Putrescine treatment in plants significantly affected on the content of chlorophyll a, b and total chlorophyll after 2nd period of putrescine application consentration 2.5 mM in Cipanas. Genotypic differences only affected on adaxial stomatal density after putrescine application in Cipanas, and adaxial stomatal density after 1st period of putrescine application in Cisarua. Genotype Sbr showed better growth in both locations compared with genotype Astreb at high temperature area.
Keyword: Bogor Agricultural University (IPB), Triticum aestivum, putrescine, physiology, morphology

Judul: Pemodelan Harga Saham Menggunakan Model Lévy dan Model Black-Scholes
Abstrak: Stock may produce high profits. However, it has a high risk as well, because the stock prices fluctuate over time. Therefore, a model is required to estimate the future stock prices accurately. In this paper, Lévy model is compared to Black-Scholes model in estimating the stock price at Bank of America Corporation. As a result, it is concluded that the Black-Scholes model is more accurate than Lévy model.
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