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INDONESIA
Journal of Tropical Crop Science
ISSN : 23560169     EISSN : 23560177     DOI : -
Core Subject : Agriculture,
Journal of Tropical Crop Science is an international journal publishing research related to tropical crops. Articles in the journal focus on in-vivo and in-vitro production and production environment, breeding, seed technology, physiology, postharvest, pest and pathology of cereals, vegetables, fruits, ornamentals, medicinal and plantation crops; soil, landscape, turf and agro ecology management under tropical conditions.
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Articles 5 Documents
Search results for , issue " Vol 4 No 3 (2017): Journal of Tropical Crop Science - available online January 2018" : 5 Documents clear
In Vitro Adventitious Shoot Proliferation of Three Basil Species (Ocimum sp. L.) by Addition of Naphthalene Acetic Acid (NAA) and Benzyl Amino Purine (BAP) Wiendi, Ni Made Armini; Putri, Devina Daratyama
Journal of Tropical Crop Science Vol 4 No 3 (2017): Journal of Tropical Crop Science - available online January 2018
Publisher : Journal of Tropical Crop Science

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Abstract

Basils are mainly used as food flavoring and source of aromatic oil, but the leaves have also been used for herbals and cosmetics. Basil is propagated by seeds but the germination is often low in the field. This study aims to investigate the effect of different concentrations of NAA (Naphthalene Acetic Acid) and BAP (Benzyl Amino Purine) to induce the adventitious shoot proliferation of three species of basil (Ocimumsp. L.) in vitro. The research was conducted at the Tissue Culture Laboratory II of the Department of Agronomy and Horticulture, Bogor Agricultural University (IPB) from November 2016 till October 2017. This research consisted of three separate experiments with one basil species for each experiment, Lemon Basil, “Greek Minette”, and “Thai Siam Queen”. The experiments were organized in a completely randomized block design with two factors: NAA concentrations (0, 0.5, and 1 mg.L-1) and BAP (0, 1, 2, and 3 mg.L-1) using Murashige and Skoog (MS) medium supplied with 25 ml.L-1 coconut water. The three basil species responded differently to NAA and BAP in the media. The optimum concentration of NAA and BAP to induce callus growth in Lemon Basil was 0.5 mg.L-1 and 3 mg.L-1, respectively, with BAP alone showing the best effect on proliferation. In “Greek Minette”, however, the addition of NAA and BAP had no significant effect on the callus growth, proliferation, height, and number of leaf, node and root per explant. Media without growth regulators provide the best results in increasing height, explant proliferation rate, number of nodes and shoots, and percentage of proliferating shoots of “Thai Siam Queen”.Keywords: cytokinin, “Greek Minette”, Lemon Basil, “Thai Siam Queen”, synthetic auxin
Status of Rice Biochemical Composition under Lodging Treatment Dulbari, Dulbari; Santosa, Edi; Koesmaryono, Yonny; Sulistyono, Eko
Journal of Tropical Crop Science Vol 4 No 3 (2017): Journal of Tropical Crop Science - available online January 2018
Publisher : Journal of Tropical Crop Science

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Abstract

Extreme weather conditions due to strong wind and high rainfall cause rice lodging. Lodged plants have lower photosynthetic rate and nutrient transport capacity which resulting in lower rice quality. However, physiological process of rice plant under lodging condition is rarely reported. Therefore the objective of this research was to evaluate the biochemical compounds of two rice varieties under artificial lodging treatment. IR64 and HIPA8 varieties were planted at the Experimental Farm in Leuwikopo, Bogor Agricultural University (IPB) in November 2016 to June 2017. At grain filling stage, rice hills were enforced to lodge using manual force until culm break. Analysis of untargeted biochemical compounds was conducted at Research and Development Institute, Laboratory of Regional Health, DKI Jakarta where rice culms from upper and below breaking position were compared. Results showed that rice culms had different biochemical compounds after lodging, especially in fatty acid, terpene, alkane, and steroid group. Lodging culms had a total of 22 to 25 compounds compared to 15 to 17 of the normal plants. It means that lodging stimulated different physiological process in rice plants. A decrease in fatty acid and an increase in the steroid level of lodged plants indicated an increase in oxidative stress of lodging condition. It is possible that low rice grain quality under lodging condition was caused by the changes in the plant physiological processes in response to the environmental stress.Keywords: extreme weather, metabolomics, oxidative stress, rice culm, rice lodging
The Use of Trellis and Mulch Increased Fruit Production of Spaghetti Squash (Cucurbita pepo L.) Kartika, Juang Gema; Karyana, Shinta Wulandari
Journal of Tropical Crop Science Vol 4 No 3 (2017): Journal of Tropical Crop Science - available online January 2018
Publisher : Journal of Tropical Crop Science

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Abstract

Spaghetti squash is squash of American origin that has spaghetti-like characteristic of fruit flesh, unlike any other squash varieties. This study aims to investigate the use of trellis and mulch to increase the spaghetti squash production. The experiment was conducted at the Experimental Station of Centre of Tropical Horticulture, Bogor from April to November 2016. The experiment used a completely randomized block design with four replicates. Two factors were tested, i.e. the use of trellis and mulch as the main plots, and accessions of the spaghetti squash as a sub-plot. The treatments were the use of trellis and mulch, mulch without the trellis, the trellis without mulch, and without the trellis and mulch. The spaghetti squash accessions used in this experiment were accessions from Taiwan (F1) and from America. Each experimental unit consists of five plants with a total a total of 160 plants. The results of this experiment showed that the growing squash using mulch and trellis had the greatest number of fruits per plant, more marketable fruits and had the largest fruit weight as compared with the other treatments. Taiwan accession had more fruits per plant and total marketable fruits, the largest fruit weight, the longest and widest fruits with large fruit diameter. Taiwan accession produced fruits at lower nodes of the plants, and fruits can be harvested earlier than the American accession. Correlation analysis indicated that the more fruits per plant, the more number of fruits that are marketable, the greater fruit weight and more fruits can be harvested from the higher nodes of the plants. From agronomical point of view, Taiwan spaghetti squash would be preferable to obtain the high fruit production provided the crops were mulched and grown with trellis.Keywords: Cucurbitacea, trellis, mulch, plant culture
Optimization of Nitrogen Fertilization and Seedling Density of A New Rice Type (Oryza sativa L.) “IPB 3S” Sugiyanta, Sugiyanta; Kusuma, Galih Angga
Journal of Tropical Crop Science Vol 4 No 3 (2017): Journal of Tropical Crop Science - available online January 2018
Publisher : Journal of Tropical Crop Science

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Abstract

The new plant type of rice, or ‘padi tipe baru’ (PTB) in Indonesian, is a new group of rice cultivars with a higher productivity compared to the modern rice varieties (‘varietas unggul baru’ or VUB). This study was conducted to determine the optimum dose of nitrogen fertilization and the seedling density or number of seedlings per hill to increase growth and yield of the new type of rice “IPB 3”. The experiment was conducted in the Bogor Experimental Station  in January to June 2015.  Nitrogen doses (90, 120, 150, 180 kg N.ha-1) and number of seeds per hill (1, 5, 10, 15 and 20) were tested.  The results showed that the increased dose of nitrogen fertilizer reduced the percentage of filled grains, the rate of photosynthesis and the grain yield per hectare. Similarly, an increase in the seedling density up to 15 seeds decreased the dry matter of the crop, the number of grains per panicle, and grain weight per plant, but increased the grain yield per hectare. The optimum yield of “IPB 3S” was achieved with  90 kg N.ha-1 with 15 seeds per hill. The results of this study have provided a guideline for an improved nitrogen management in relation to rice seedling population to increase yield of a new rice type “IPB3S”.Keywords:  “IPB 3S”, new plant type, fertilizer, local variety
Optimation of In vitro Lateral Shoots Multiplication of Papaya (Carica papaya L.) “Callina” with BAP and NAA Efendi, Darda; Putra, Mirza R
Journal of Tropical Crop Science Vol 4 No 3 (2017): Journal of Tropical Crop Science - available online January 2018
Publisher : Journal of Tropical Crop Science

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Abstract

Papaya is a popular fruit and is grown commercially in many subtropical and tropical countries. Papayas are generally grown from seeds; therefore the offsprings are not true-to-type and could come in three sexes, female, male, and hermaphrodite. Clonal propagation is required to obtain to grow true-to-type hermaphrodite papayas. In this research, we developed an in vitro protocol for shoot multiplication from lateral shoots from in vitro germinated papaya seedlings. The in vitro propagated plant materials could potentially be used as a source of papaya micro cuttings, or as scion for papaya grafting. The experiment was set up as a factorial experiment with NAA at 0, 0.1 and 0.5 mg.L-1, and BAP at 0, 0.1, 0.5, and 1.0 mg.L-1 in a completely randomized block design. BAP interacted with NAA in affecting the shoot production per explant. The optimum BAP and NAA concentration to produce lateral shoots was 0.54 mg. L-1 and 0.1 mg.L-1, respectively. Media without NAA reduced the number of lateral shoots and number of leaf per explant at any BAP concentration.Keywords: hermaphrodite, seeds, true to type, clonal propagation, micro cuttings.

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