Begonia bimaensis Undaharta & Ardaka adalah salah satu Begonia yang dikembangkan di Kebun Raya "Eka Karya" Bali. Jenis ini merupakan spesies endemik yang ditemukan di Gunung Muria di Kabupaten Bima, Pulau Sumbawa. Begonia bimaensis memiliki rambut putih yang tumbuh pada permukaan atas daunnya. Perbanyakan tanaman B. bimaensis perlu dilakukan dengan teknik kultur jaringan karena terbatasnya tanaman dan untuk menjaga kelestariannya. Tujuan penelitian ini adalah mengetahui teknik sterilisasi yang tepat untuk inisiasi eksplan daun B. bimaensis dan mengetahui kombinasi ZPT kinetin dan 2,4-D yang paling efektif serta pengaruhnya terhadap pertumbuhan kultur B .bimaensis. Penelitian ini menggunakan media dasar MS (Murashige dan Skoog) dengan penambahan kombinasi ZPT kinetin (0 ppm, 1 ppm, dan 2 ppm) dan 2,4-D (0 ppm, 0,5 ppm, dan 1 ppm). Percobaan terdiri dari 9 perlakuan yang setiap perlakuan terdiri dari 3 ulangan dengan tiap ulangan terdiri dari 1 botol. Hasil penelitian menunjukkan bahwa teknik sterilisasi yang tepat yaitu menggunakan kombinasi sterilan yang berbeda (sabun Sunlight, fungisida, pemutih Bayclin, dan alkohol) dan waktu perendaman menggunakan fungisida selama 30 menit. Pemberian ZPT kinetin dan 2,4-D terhadap B. bimaensis mengakibatkan pertumbuhan yang lebih cepat. Pengaruh paling tinggi terhadap pertubuhan kultur B. bimaensis diperoleh pada hari ke-12 setelah tanam dengan pemberian kinetin 2 ppm dan 2,4-D 0,5 ppm.

Begonia bimaensis Undaharta & Ardaka is a potential ornamental plant, and currently known only from one population in Sumbawa. Propagation programs, both conventional and in vitro culture are necessary to ensure its conservation. The aim of this research is to observe the effects of explant types and plant growth regulator combination (2,4-D and kinetin) in inducing callus from B. bimaensis leaf in vitro. Callus induction was initiated from three parts of leaf explant, namely petiole, leaf base, and leaf lamina. The explants were planted on Murashige & Skoog (MS) medium with addition of 2,4-D and kinetin. Concentrations of 2,4-D were 0, 0.5, and 1 ppm, while kinetin concentrations were 0, 1, and 2 ppm. Each treatment was replicated 10 times. Results showed that leaf base was the best explant used for callus induction. Medium D1K2 (MS + 1 ppm kinetin) showed the fastest time for callus induction that was at 20 days after planting. The highest percentage of callus production (100%) was found on D1K3 (MS + 2ppm kinetin); D2K2 (MS + 0.5ppm 2,4-D + 1 ppm kinetin); D2K3 (MS + 0.5ppm 2,4-D + 2ppm kinetin) and D3K2 (MS + 1ppm 2,4-D + 1ppm kinetin).

<p>Pengetahuan mengenai proses-proses fisiologis pada planlet perlu dketahui untuk menjamin keberhasilan transplantasi planlet ke lingkungan <em>ex vitro</em>. Tujuan dari penelitian ini adalah untuk mengetahui densitas dan pola buka-tutup stomata pada 3 (tiga) jenis planlet anggrek hasil kultur <em>in vitro</em> selama tahapan aklimatisasi di KREKB-LIPI. Informasi ini penting untuk mengetahui jalur fotosintesisnya sehingga dapat dirumuskan tindakan-tindakan yang sesuai terkait proses aklimatisasi dan pertumbuhan selanjutnya pada planlet anggrek tersebut di lapangan. <em>B. echinolabium</em> merupakan anggrek dengan tipe fotosintesis C3, sedangkan <em>D. fimbriatum</em> dan <em>D. spectabile</em> merupakan anggrek dengan tipe fotosintesis CAM. </p>

Paphiopedilum javanicum (Reinw. ex Lindl.) Pfitzer known as slipper orchid is an endemic terrestrial orchid from Indonesia. This orchid is threatened with extinction and listed under CITES Appendix I. In-vitro propagation of P. javanicum has been done in Bali Botanic Garden (BBG) for last six years but acclimatization stage has not given satisfied result. The purpose of this study was to know the ef-fect of liquid fertilizer on vegetative growth of P. javanicum planlet during acclimatization stage. Beyonic StarTmik liquid fertilizer ap-plied by five different doses considered as treatment of 0, 10, 20, 30 and 40 mL. They were 10 planlets for each treatment considered as replication. In this research we observe vegetative growth of P. ja-vanicum by quantitative and qualitative parameter. Quantitative data were analysis by ANOVA. Result showed, high percentage of planlet survival was observed of 98% and liquid fertilizer dose for 30 mL gave the optimal vegetative growth of P. javanicum planlet with aver-age height of 2.2 cm and leaves number of 13 pieces. There were no differences on qualitative parameter in all treatment that all leaves color was dark green and leaves tessellation appearance was obvious

Orchid roots have vital functions for water absorption, nutrient uptake, a place of symbiosis with mycorrhizal fungi, adaptation, and survival. The aim of the present study was to investigate root traits in terms of root morphological, anatomical, and mycorrhizal features of a terrestrial orchid, Peristylus goodyeroides in relation to an ecological significance of root traits in survival of seedlings, juveniles, and adults of the orchid. Results showed that some morphological characters (root length and depth), anatomical features (cortical cell size, xylem number and diameter), and mycorrhizal features (peloton size and number) were significantly different between seedlings, juveniles, and adults. In relation to root functional traits, lowest root length, depth, xylem number and diameter, peloton size and number in seedlings can be associated with low capacity in water and nutrient acquisition that might explain low survival of seedlings relative to juveniles and adults. Present study has implication for orchid conservation suggesting high attention in low survival rate of seedlings related to specificity in some of their morphological, anatomical, and mycorrhizal features which can be associated with low capacity in water and nutrient acquisition. It is vital to ensure water availability for seedlings, particularly, during dry seasons to decrease high mortality of seedlings as such high mortality can have adverse impacts on long-term survival of the orchid population.