Judul: Pengaruh Benzylaminopurine (BAP) dan Air Kelapa terhadap Laju Multiplikasi Stek Batang Nenas (Ananas comosus L. Merr) Klon Pasir Kuda-1
Abstrak: The research aimed to study the effects of Benzyladeninepurine (BAP) and coconut water by induces producing shoots from mother stems of pineapple (Ananas comosus L. Merr). The research was used Pasir Kuda-1 clone as planting materials. It was conducted at Pasir Kuda Research Farm at Bogor Agricultural University from January to June 2010. Method of this research was based on a completely block randomized design, consisted of one factor and three repetitions. The factor was the BAP concentration (0, 25, 50, 100 ppm) and coconut water. The stems of mother plant were sliced and soaked in solution of BAP and coconut water, and then they were raised in a husk charcoal media for several weeks until the shoots force out from lateral buds. These shoots were maintained in a secondary nursery until they reach the transplanting maturity. The shoots begin force out from lateral bud after two weeks and allowed to grow on stem cuttings until it has enough size for transplanting in secondary nursery. The data were analyzed by F test and significantly different results were tested further using Duncan's Multiple Range Test (DMRT) at 5% level. Variables observed at seeding stage are percentage of life cuttings, percentage of cuttings sprouted up, and shoots per cutting, while in the seedling stage are shoot high, shoot weight, leaf length, leaf width, and number of leaves. Harvesting was done gradually by four times and made observations of the quality of shoots produced at each harvest. The result showed that the treatment of BAP concentration and coconut water did not significantly affect to all of variables in primary nursery, such as percentage of live cuttings, percentage of cuttings sprouted up, and shoots per cuttings. Treatment also did not significantly affect in secondary nursery, except the number of leaves on shoots that are harvested first at 6 weeks after transplantation. The repetition based on planting material had significant effect on shoot height, leaf length, number of leaf, and weight of shoots. Time of harvesting also affected the quality of shoots produced. Harvesting with good quality of shoots was able until 16 week after plant period. The number of shoots height, shoots weight, leaf width, leaf length and leaf number decreased while the shoots harvested after those period.
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Judul: Pengembangan Teknologi Perbanyakan Bibit nenas smooth cayenne secara in vivo melalui aplikasi auksin dan sitokinin
Abstrak: Pineapple plantation needs 40.000-60.000 seedlings per hectare, so it is important to have simple, efficient and effective propagation technology. The objectives of this research are to study the effect of IBA and BA to improve the success of seed production by in vivo. The study was conducted in three experiments. The first and the second experiment were to study the effect of indole-3-butyric acid (IBA) at 0, 25, 50 ppm and Benzyl Adenine (BA) at 0,25,50 and 75 ppm on the successful of basal leaf cuttings from stem and crown of pineapple GP-1 (Ananas comosus L. Merr). The third experiment was to determine the effect of sytokinin on the different size of buds generated from crown leaf cuttings. The result showed that leaf cutting from stem potential used as an alternative materials for seed propagation of pineapple. Increased of auxin concentration up to 50 ppm on leaf cuttings of stem inhibit shoot height. Contrarily, cytokinin treatment up to 50 ppm increased the height of shoots. Application of auxin up to 50 ppm on leaf cuttings of crown increase the percentage of rooted cuttings and percentage of budding per shoots (2-3 shoot per cutting), but application of cytokines up to75 ppm suppress seedling height, width leave and reduce the emergence rate of shoots at 50 ppm. Application of cytokinin (BA) 25 ppm and 50 ppm increased the percentage of sprouted cuttings and number of nodules on small buds and medium buds. Percentage sprouted cutting on small buds higher than medium and bigger buds. Using economic analysis, it is showed that IBA 50 ppm application on crown leaf cuttings is the most optimum materials used for seed propagation by in vivo.The success of seed multiplication in vivo through cuttings leave from the crown better than cuttings from leave stem.
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Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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