Judul: Karakter Reproduktif Gandum (Triticum aestivum L.) Toleran Suhu Tinggi di Dataran Tinggi dan Sedang
Abstrak: Wheat (T. aestivumL.) is a cereal crop and member of the family Gramineae originated from subtropic region. It is suggested that putrescine aplication may improve wheat growth in tropical environment indicating that wheat crop might be resistant to high temperature stress and also able to increase its production. This study aimed to observe the effect of putrescine treatment to the reproductive characters of three cultivated varieties of high temperature-tolerant wheat that were plantedin Cisarua 600 m asl and Cipanas 1100 m asl, West Java. This experiment was designed as a factorial experiment with 2 factors. The first factor was putrescine with three consentrations 0, 1.25, and 2.5 mM. The second factor was wheat varieties, SBR, ASTREB and Nias. Wheat varieties influenced plant height and some reproductive characters including flowering and harvesting age, panicle length, number of spikelet, number of floret, number of empty floret, and seed weight per panicle. Moreover, altitude affected the plant height and number of tillers, but it did not affect the reproductive characters. Reproductive characters did not respond to putrescien application. The three cultivated varieties are high temperature-tolerant, therefore the varieties can be grown in two planting location.
Keyword: Triticum aestivum L., tolerant temperature, wheat reproductive, Putrescine

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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