Judul: Pemanfaatan Minyak Sereh dan Filtrat Trichoderma sp. untuk Mengendalikan Patogen Terbawa Benih Acacia mangium Willd.
Abstrak: This research is aimed at studying the potency of lemon grass oil and antagonistic fungus Trichoderma sp. in controlling pathogen carried by Acacia mangium Willd. The research was conducted in Forest Biotechnology Laboratory of Center for Natural Resources Reseach and Biotechnology IPB, and Cikabayan Experimental Station of IPB. The treatments were : (1) soaking seed in 0.1 % lemon grass oil, (2) soaking seeds in filtrate culture of Trichoderma sp., and (3) control (seeds without soaking). The experiment used complete randomized design with four replications. Variables observed were percentage of F. solani attack, peroxidase activity, and the length of seedling stem. The result reveals that treatments were not significantly different based on the variables observed. However, soaking seeds in filtrate culture of Trichoderma sp. tend to be better lengthen the stem seedling of A. mangium.
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Judul: Peran bakteri kitinolitik dan fungi mikoriza arbuskular dalam pengendalian busuk pangkal batang kelapa sawit
Abstrak: Basal stem rot (BSR) is the most serious disease of palm oil that caused by Ganoderma boninense Pat. The objectives of these researches were to find chitinase-producing bacterial which inhibit G.boninense growth and to determine the relationship between mycorrhizal and chitinolytic bacterial in controlling the BSR. The experimenthals were conducted in laboratory, secreen house dan fields. The research activities were: (i) exploration of chitinolytic bacterial as antagonistic agents of pathogens (ii) evaluate the pathogenicity, index chitinolitic of the chitinolytic bacterial and their antagonism effect against G. boninense, (iii) study on the application of chitinolytic bacterial and AMF in controlling the oil palm BSR through split plot experimenthal design. There were seven isolate B13, B14, B16, B42, Al11, TB41 and L34 have been selected as the best chitinolase-producing bacterial and they were not pathogenic to plants. The study showed that selected bacterial have differences on chitinolytic index. All of them suppressed the growth of G. boninense above 95% in vitro antagonism test using dual culture method on liquid media. However the antagonism test on PDA only isolate of AL11, TB41 and L34 had higher antagonism capacity against the pathogen. The severity of basal stem rot that expressed by the root necrotics were reducted since the oil palm seedling showed high degrees of mycorrhizal root colonization. The application of combination of chitinolytic bacterial and AMF suppressed the disease severity (95%) higher compare to the single one (55% - 7
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Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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