Buletin Kebun Raya

51-64

Authors: Izu Andry Fijridiyanto, Noriaki Murakami

Hubungan kekerabatan (filogenetik) Litsea dan marga-marga yang berdekatan (Actinodaphne, Lindera and Neolitsea) dari suku Lauraceae telah diamati dengan menggunakan data molekular. Analisis dilakukan pada sekuens nukleotida dari gen-gen kloroplas matK dan ndhF. Walaupun gen-gen ini dikenal sebagai untaian pengkode yang berevolusi dengan cepat, tetapi untuk taksa tumbuhan yang diamati pada penelitian ini menunjukkan variasi yang rendah. Pohon-pohon filogenetik hasil analisis gabungan dari sekuens nukleotida matK dan ndhF menunjukkan bahwa marga Litsea tidak monofiletik. Di antara empat seksi dari marga Litsea (seksi Tomingodaphne, seksi Litsea, seksi Conodaphne dan seksi Cylicodaphne), hanya seksi Litsea yang monofiletik.

69-78

Authors: Sunaryo Sunaryo

Botanic Garden represents an ecosystem area in which parasitic plants such as mistletoes are also incorporated. Mistletoe of Dendrophthoe pentandra (L.) Miq. (Loranthaceae) was a parasite of various plants cultivated in Botanic Gardens of Purwodadi, Bali, and Cibodas. The mistletoe attacked 143 host species which included in 48 plant families in those three Botanic Gardens. The most attacked host plants were belong to family Moraceae, especially Ficus spp., following by members of Myrtaceae, especially Syzygium spp. The ability to become parasite of various plants species assured that mistletoe of D. pentandra did not chosen certain host plants. The parasitic study of mistletoe D. pentandra is also reported in this paper.

86-93

Authors: R. Subekti Purwantoro, Hartutiningsih-M. Siregar, Sudarmono Sudarmono, Praptiwi Praptiwi

Lasianthus, a member of the family Rubiaceae has potential for medicinal plants. The aims of the research were to find out the potential antibacterial activity of Lasianthus leaf extract and to investigate the effectiveness of plant propagation by stems cutting. The species tested were Lasianthus laevigatus Blume, L furcatus (Miq.) Bremek and L. cf. obscurus Blume. The extracted leaves in n-hexana, ethyl acetate and methanol were tested in vitro against Staphylococcus aureus and Escherichia coil activities that grown on medium of Mueller-Hinton agar. The methanol extracts of each plant material showed significant antibacterial activities on S. aureus and E. coll. Antibacterial activity increased with increasing concentration of the extracts. Plant propagation by stems cutting were done as a first step of conservation effort for respective species. Stems cutting of L. laevigatus, L. purpureus, L. furcatus, L. acuminatus, L rhinocerotis. and L. cf. obscurus with length of 10 cm were applied with Rotoon F to stimulate root growth. The result of plant propagation research showed that only the stems cutting of L. cf. obscurus grew well although roots did not grow until 4 months.