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"ABSTRACTGene-specific markers are important tools in genetic analysis, allowing direct estimation of functional diversity. The goal of this study was to develop intron length polymorphism (ILP) markers from candidate genes associated with the secondary growth related traits that underpin the economics of rubber tree cultivation. We performed a BLAST analysis of Eucalyptus spp. expressed sequence tag (EST) sequences for 23 candidate genes involved in secondary growth. From the total 142 shotgun contig hits, 531 introns were identified and 23 polymorphic ILP markers representing 23 candidate genes were selected for diversity assessment of 170 Amazonian accessions. The markers yielded 140 alleles with an average of 6.1 alleles per locus. Polymorphism information content (PIC) values ranged from 0.40 to 0.89, with an average of 0.64, indicating a high level of polymorphism in the markers. Analyses of population structure confirmed that the Amazonian accessions fell into two subpopulations grouped by catchment area, supporting previous reports. Among the 23 ILP markers analyzed, 11 revealed private alleles across Amazonian populations. The ILP markers developed in this study provide an immediate resource for the study of genetic diversity and establishment of marker-trait association for secondary growth traits in rubber trees."

"Tanaman karet sebagai tanaman yang dapat berperan penting dalam penyerapan serta penyimpanan karbon. Penyerapan karbon dilakukan sebagai salah satu upaya untuk mengurangi efek gas rumah kaca di atmosfer. Kapasitas penyerapan stok karbon pada tanaman karet dapat dilihat dari nilai biomassa yang dimilikinya. Penelitian ini bertujuan untuk menganalisis persebaran stok karbon tanaman karet dan hubungannya dengan umur tanaman karet. Persebaran stok karbon di daerah wilayah penelitian dengan menggunakan pendekatan indeks vegetasi, serta analisis regresi dan deskriptif. Indeks vegetasi yang digunakan yaitu MSAVI, OSAVI, SAVI, GNDVI, dan ARVI yang diperoleh dari pengolahan citra satelit Sentinel 2- A. Nilai biomassa pada tanaman karet didapatkan dari persamaan alometrik. Hasil penelitian menunjukkan bahwa persebaran stok karbon hampir di seluruh wilayah Pusat Penelitian Karet Sembawa. Hubungan umur tanaman karet dengan nilai stok karbon cenderung rendah karena dipengaruhi oleh jenis klon, pengelolaan tanaman karet, dan penyakit tanaman karet.

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Rubber is a plant that can play an important role in carbon sequestration and storage. Carbon sequestration is carried out as an effort to reduce the effect of greenhouse gases in the atmosphere. The absorption capacity of carbon stock in rubber plants can be seen from the value of its biomass. This study aims to analyze the distribution of carbon stock in rubber plants and its relationship with the age of rubber plants. The distribution of carbon stock in the study area using a vegetation index used is MSAVI, OSAVI, SAVI, GNDVI, and ARVI obtained from processing the Sentinel 2-A satellite imagery. The value of biomass in rubber plants is obtained from the allometric equation. The results showed that the carbon stock distribution in almost all areas of the Sembawa Rubber Research Centre The relationship between the age of rubber plants and the value of carbon stock tends to be low due to it is influenced by the type of clone, management of rubber plants, and rubber plant diseases."