Konservasi ex situ merupakan salah satu upaya untuk mengatasi keterancaman dan kepunahan jenis tumbuhan di habitat alamnya. Kebun Raya Bogor merupakan lembaga konservasi ex situ yang memiliki koleksi pohon ikonis dan bernilai sejarah yang perlu dijaga kelestariannya. Penilaian kesehatan pohon merupakan teknik untuk mengidentifikasi kesehatannya, memberikan rekomendasi, dan mitigasi penanganannya. Tujuan penelitian ini adalah untuk menilai kesehatan 12 pohon ikonis dan bernilai sejarah koleksi Kebun Raya Bogor. Survei lapangan menggunakan metode purposive sampling pada pohon yang dikategorikan sebagai pohon ikonis dan bernilai sejarah. Teknik Penilaian kesehatan pohon dilakukan menggunakan dua cara yaitu secara visual (Forest Health Monitoring) dan teknologi gelombang suara sonic tomograph untuk mendeteksi tingkat pelapukan batang. Hasil penelitian menunjukkan bahwa status kesehatan pohon ikonis dan bernilai sejarah termasuk kategori sehat (67%), kelas kerusakan ringan (25%), kelas kerusakan sedang (8%) dengan nilai rata-rata t/R ratio sebesar 0,82. Keseluruhan pohon dikategorikan aman, kecuali Koompassia excelsa dalam kondisi berbahaya (t/R ratio 0,28). Rekomendasi penanganan pohon ikonis dan bernilai sejarah adalah pengamatan rutin menggunakan metode visual (durasi 1–2 bulan) dan pengamatan menggunakan Sonic tomograph setiap tahunnya.

AbstraetThe influence of different growth irradiance conditions on plant development and foliar features were assessed in a shade-adapted fern variety, Pteris cretica var. ouvrardii. A comparison of frond morphology, anatomy, chloroplast infrastructure and chlorophyll conlcnl of plants cultivated in both greenhouse and in controlled growth chambers under moderate light, low light (control) and extreme shade revealed pronounced phenotypic modifications. Moderate light induced decreased frond surfaces, thicker leaves, lower chlorophyll content per surface unit, and a markedly reduced density of intraplastidial membranes. In contrast, morphological responses to extreme shade included the formation of larger, thinner fronds, increased chlorophyll content, and a higher membrane density in chloroplasts. A dorsi-vcntral distribution of starch-gorged chloroplasls (lower mesophyll cell layers) and essentially starch-free chloroplasts (upper cell layer) characterizes low-light and moderatelight fronds, while homogenous starch-free chloroplasts are present in all cell layers of extreme shade fronds. The light-induced modifications are discussed as adaptive responses.

Abstract. Indigo leaves (Indigofera tinctoria L.) are utilized as a source of batik dye in Java and Madura islands, Indonesia. Batik makers from the islands collect indigo leaves from wild plants. Continuous collection of wild plants from their natural habitat may decrease their diversity. The present research was conducted to analyze the genetic diversity and population structure of I. tinctoria L. from Java and Madura. 55 indigo accessions were collected from 10 locations in Java and Madura. The indigo DNA was extracted and amplified using 15 ISSR primers. A total of 123 bands showed 50-90% polymorphic loci. PCA and UPGMA were used to analyze the data. All indigo accessions were clustered into 4 groups at a 60% similarity coefficient: a group consisting of Madura accessions, a group consisting of East Java accessions, a group consisting of Central Java accessions, and a group consisting of West Java accessions. Accessions collected from the same or adjacent populations tended to show similar ISSR characteristics. The genetic diversity of indigo in Java and Madura islands is relatively high (%P = 68.3), but the diversity residing within each population is lower (37%) than that between populations (63%).

Arifin Surya Dwipa Irsyam, Rina Ratnasih Irwanto & Muhammad Rifqi Hariri. 2019. Catatan Keberadaan Costus  afer Ker Gawl. (Costaceae) di Pulau Jawa. Floribunda 6(2): 64–71. —  Suatu jenis Costus introduksi dari Afrika, yaitu Costus afer Ker Gawl., telah ditemukan tumbuh ternaturalisasi di Maribaya (Lembang), Dago Atas (Bandung), dan Kampus IPB Dramaga, Bogor. Keberadaan populasi liar C. afer di Pulau Jawa belum pernah dilaporkan sebelumnya. Jenis tersebut juga belum terdaftar dalam Flora of Java. Secara morfologi, C. afer sering salah teridentifikasi sebagai C. lucanusianus J. Braun & K. Schum. Informasi mengenai populasi liar dan ciri morfologi C. afer dilaporkan dalam catatan ini.