Kebun Raya Bogor (KRB) merupakan salah satu kebun raya tertua di Asia Tenggara yang memiliki jumlah koleksi tumbuhan mencapai lebih dari 12.000 spesimen. Kondisi kesuburan tanah sangat penting untuk pengelolaan koleksi di KRB, namun saat ini kondisi kesuburan tanah di KRB belum diketahui. Tujuan penelitian ini adalah untuk mengetahui kondisi kesuburan tanah, meliputi sifat kimia dan fisika tanah. Diharapkan dapat menjadi bahan pertimbangan dalam manajemen kesuburan tanah sehingga tumbuhan koleksi dapat tumbuh dengan optimal. Penelitian dilaksanakan pada bulan Maret–Oktober 2019. Metode yang digunakan adalah survei tanah detail (skala 1:5.000–1:10.000) dengan tujuan khusus yaitu kesuburan kimia dan fisika tanah. Pengambilan sampel berdasarkan overlay dari peta kebun, tutupan lahan (rumput; serasah, dan tanpa serasah) dan kontur. Sampel yang diambil dengan metode ring sampel dan tanah terganggu. Variabel pengamatannya mencakup tekstur, pH, kapasitas tukar kation, nitrogen total, P2O5 tersedia, K2O tersedia, dan C organik. Hasil penelitian menunjukkan bahwa kondisi kesuburan tanah di KRB cenderung rendah hingga sedang (94,07%) pada berbagai tipe tutupan lahan. Tutupan serasah memiliki kesuburan tanah lebih tinggi dibandingkan lainnya (45,32%) (kategori rendah–sedang). Saran yang dapat direkomendasikan adalah pengelolaan zonasi serasah, sehingga proses dekomposisi berjalan dengan siklus hara tertutup.

Abstract. Oksari AA, Susanty D, Wanda IF. 2019. Allelopathic effect of invasive species air potato (Dioscorea bulbifera) on seeds germination of Polyalthia littoralis. Nusantara Bioscience 11: 63-70. Dioscorea bulbifera L. (Dioscoreaceae) is included in the Global Weed Compendium and one of the invasive plants that cause environmental problems in many parts of the world. This study aims to determine the effect of allelopathy from various concentrations of leaf and tuber extract from D. bulbifera on seed germination of Polyalthia littoralis (Blume) Boerl. The method used was a Completely Randomized Design (CRD) with seven treatments and three replications. The treatment given was the concentration of D. bulbifera extract 10%, 20%, 40%, 60%, 80%, 100% and aquadest solvent control. The results of phytochemical screening analysis showed that the extract of leaves and tuber of D. bulbifera did not contain alkaloids, but specifically on leaves extract contained tannins. Both extracts contained steroids, flavonoids, and saponins. Based on the results of the study, total phenolic obtained in the leaf extract as much as 28.81 ± 2.51 mg TAE/g extract, while the tuber extract had a total phenolic of 6.74 ± 1.19 mg TAE/g. The results showed that allelopathic substances of D. bulbifera affected the germination of P. littoralis seeds. Based on DMRT test at 5% level, it was known that allelopathy concentration of D. bulbifera significantly affected the germination rate at concentrations of 20%, 60%, 80%, and 100% and significantly affected the coefficient of velocity of germination at a concentration of 20%. But, concentration allelopathy of D. bulbifera had no significant effect on the coefficient of uniformity of germination. The concentration that reduced the lowest seed viability was at a concentration of 80% with an average germination power of 56.67 ± 7.45%.

Diospyros spp. is one of the genera of the Ebenaceae that has the highest distribution in tropical Asia and Africa. The high rate of deforestation in the tropics, so we need for preservation of species in conservation ex-situ at the Botanical Gardens. Research on the basic information and potential of Diospyros spp., the collection of the Bogor Botanical Gardens has been carried out through direct observation of all the Gardens’ Diospyros collections, both in the field and in the nursery. The results obtained as many as 32 species of Diospyros spp. which have been collected with the most specimens of the species Diospyros celebica, D. buxifolia, and D. maritima. Meanwhile, the source collection Diospyros spp. mostly from Sulawesi. The general potential of Diospyros spp. used as a valuable timber (ebony) and edible fruit.

Bogor Botanic Gardens is one of the outstanding green areas in Bogor City. Thousands of plant species are growing and providing suitable habitats and feed for various pollinators, such as butterflies, bees, and wasps. A well-designed pollination garden will benefit the pollinators and also create an educational facility for the community. This study aimed to select and characterize species of flowering plants that effectively attract pollinators, particularly Lepidoptera and Hymenoptera, in the pollination garden candidate area. The observa-tion had been carried out on 12 ornamental plant species: Pennisetum purpureum, Cosmos sp., Pachystachys lutea, Cuphea hyssopifolia, Orthosiphon aristatus, Lantana camara, Citrus aurantifolia, Buddleja davidii, Ixora javanica, Nerium oleander, Hibiscus rosa-sinensis, and Aglaia odorata. The method for observing pollinators was a standard walking method. Pollinator photos, its number, its visit time, and the plants it visited were recorded. A total of 23 species of Lepidoptera (20 species from 4 families and 3 species were unidentified) and 9 species of Hymenoptera (4 families) were found in the area with the best obser-vation time at 08.30-09.30 (GMT+7). The most visited plants by pollinators were Cuphea hyssopifolia, Lantana camara and Orthosiphon aristatus. Lepidoptera and Hymenoptera preferred blue-purple and bright-orange-yellow flowers. In addition, the flower characters that might influence pollinator visits are also described. The result would be an essential recommendation for plant selection, landscape design, and construction of the pollination garden in Bogor Botanic Gardens.

Abstract. Wanda IF, Djuita NR, Chikmawati T. 2021. Molecular phylogenetics of Malesian Diospyros (Ebenaceae) based trnL-F spacer sequences. Biodiversitas 22: 4106-4114. Diospyros is a genus composed of potential species as an economic commodity with high diversity. However, there is limited information on the phylogenetic relationship of this genus in the Malesian region. This study aimed to provide information on the species diversity through a DNA barcoding approach and revealing the phylogenetic information of Diospyros spp. in the Malesian region. This study used 20 Diospyros accessions from Bogor Botanical Garden collections, 40 Diospyros accessions, and four outgroup accessions obtained from the NCBI database. The DNA barcoding primer utilized comes from plastids, trnL-F intergenic spacer. The phylogenetic trees were constructed using the Maximum-Parsimony method. A total of 20 accessions of Diospyros were validated with sequence data on the genebank. The result showed that all accessions had relationships with 44 other Diospyros species globally. Here, we reported 10 new trnL-F intergenic spacer sequences of Malesian Diospyros species. A phylogenetic tree grouped 64 monophyletic Diospyros species into seven clades. The phylogenetic results supports the biogeographic hypothesis: the Malesian region, the Malesian-Caledonian Region, and Cosmopolite species in almost all bioregions.