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2023-10-31T19:20:47+07:00

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VARIATION IN SUGAR CONTENT AND DISTRIBUTION IN SYZYGIUM SAMARANGENSE FRUITS

2023-08-09T08:34:25+07:00

Jambu semarang (Syzygium samarangense) terdiri dari banyak kultivar dengan kadar gula yang berbeda-beda. Pada setiap buah, kandungan gulanya tidak merata. Tingkat kemanisan buah seringkali menjadi penentu nilai ekonomi dari jambu semarang. Tujuan penelitian ini adalah 1) untuk mengetahui sebaran gula pada berbagai kultivar jambu semarang, 2) mengetahui sebaran kadar gula di dalam buahnya, 3) mengetahui pengaruh rerata hari hujan per bulan terhadap kandungan gula buah. Metode yang digunakan dalam penelitian ini adalah survei dengan purposive sampling, observasi laboratorium dengan mengukur kadar gula dengan refraktometer, mengkorelasikan faktor lingkungan dengan kandungan gula buah. Hasil penelitian ini menunjukkan bahwa buah dengan kadar gula tertinggi terdapat pada kultivar Syzygium samarangense 'Sukaluyu' (maks 16,5 ◦Brix), S. samarangense 'Madu' (maks 14 ◦Brix), S. samarangense 'Kesuma Merah’ (max 10.5 ◦Brix), S. samarangense 'Citra' (maks 8.5◦Brix) yang cocok untuk buah-buahan segar. Sedangkan yang kadar gulanya rendah seperti S. samarangense 'Bajang Leang’ (4.5 ◦Brix), S. samarangense 'Kuning’ (4 ◦Brix) lebih cocok untuk lutis. Pada buah S. samarangense, gula tertinggi biasanya terakumulasi di bagian ujung buah, dan gula terendah berada di pangkal buah. Kadar gula berkorelasi negatif dengan rerata hari hujan per bulan. Makin sedikit hari hujan, buah semakin manis.

HUBUNGAN KEKERABATAN Nepenthes HIBRID HASIL PERSILANGAN ALAMI ANTARA Nepenthes mirabillis (Lour.) Druce DAN Nepenthes reinwardtiana Miq BERDASARKAN KARAKTER MORFOLOGI

2023-09-24T20:57:33+07:00

Nepenthes is a carnivorous plant that can cross-pollinate the same or different species so that it can produce hybrid Nepenthes. An analysis of the relationship between Nepenthes species and their hybrids can be carried out by observing the morphological characters. The purpose of this study was to determine the morphological characteristics and the relationship between Nepenthes hybrids and their parents. This study used Nepenthes hybrid resulting from a cross between N. mirabillis and N. reinwardtiana which were found in Entikong District, Sanggau Regency. The relationships were analyzed using the NTSys program with the UPGMA method. Nepenthes reinwardtiana does not have variations in pitcher color or shape. Nepenthes mirabillis and N. mirabillis X N. reinwardtiana had variations in pitcher color and shape. Nepenthes hybrid has a characters inherited from both parents. Nepenthes reinwardtiana, N. mirabillis, and N. mirabillis X N. reinwardtiana had a similarity level of 0.46 and were divided into three clusters. The relationship between N. mirabillis and N. mirabillis X N. reinwardtiana has the greatest similarity coefficient value of 0.77, while N. reinwardtiana and N. mirabillis X N. reinwardtiana have a similarity coefficient value of 0.64. Morphological characters show clear differences in the pitcher. The relationships of Nepenthes hybrid is closer to N. mirabillis.

NEOTYPIFICATION OF TWO MARASMIELLUS SPECIES (AGARICALES: OMPHALOTACEAE)

2023-10-13T16:08:12+07:00

The typification of two species of Marasmiellus is discussed. Since the holotypes of Marasmiellus nugatorius and Marasmiellus pangerangensis did not exist, therefore neotypes of both species are designated here. To aid further identification of those species, a line drawing of macro-micromorphological features is provided.

KEANEKARAGAMAN MARGA Nothaphoebe Blume, SUKU LAURACEAE (MEDANG - MEDANGAN) DARI PROVINSI LAMPUNG, KOLEKSI HERBARIUM BOGORIENSE (BO)

2023-10-31T18:24:03+07:00

Nothaphoebe Blume is a genus of the Lauraceae or Medang-medangan family, and is included in the Persea subgroup together with the genera Alseodaphne, Dehaasia, Persea, and Phoebe. Information on the diversity of Nothaphoebe in Sumatra, especially in Lampung province, has never been reported. Therefore, the aim of this study was to understand the morphological characters and species of Nothaphoebe occured in Lampung. The morphological characters observed included twigs, leaf shape, flowers, and fruits. The results of morphological characterisation show that there are five species of Nothaphoebe, i.e., Nothaphoebe falcata, Nothaphoebe foetida, Nothaphoebe macrocarpa, Nothaphoebe magnifica, and Nothaphoebe umbelliflora. Identification key for species, descriptions of each species and distribution maps are presented in this article.

Keywords: Herbarium Bogoriense, Lauraceae, Morphology, Nothaphoebe, Lampung Province

EPISTOLA BOTANICA: MAYACACEAE IN INDONESIA: AN ALIEN FAMILY ESCAPED FROM CULTIVATION

2023-04-03T11:07:44+07:00

Mayacaceae Kunth is a monogeneric family with a single genus, Mayaca Aubl. Its family members are herbs found in swamps, lakes, and rivers. The family is distributed throughout the Neotropics, except for M. baumii Gürke, which is only found in Africa [de Carvalho MLS & Machado AFP., Revisiting Mayacaceae Kunth towards to future perspectives in the family, Rodriguésia 66(2): 421-427. 2015]. Mayacaceae consists of ten species and one of them, Mayaca fluviatilis Aubl. is widely cultivated as an aquascape ornamental plant, including in Indonesia. This aquatic family is not yet recorded in the Flora of Java Vol. III [Backer CA & Bakhuizen van den Brink RC., Flora of Java, Vol. III, Groningen: NVP Noordhoff. 1968].

DALAM KENANGAN Prof. Dr. Johanis Palar Mogea (JP Mogea)

2023-10-31T19:23:37+07:00

Dalam Kenangan

Prof. Dr. Johanis Palar Mogea (JP Mogea)

Mitra Bestari Oktober 2023

2023-10-31T19:21:58+07:00

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