Binuang is fast growing species which is native in Indonesia. This research is purposed to know the role of genetic variation to characteristic of binuang seedling at the age of 6 th and 10 th month from several mother trees from Pasaman, West Sumatera provenances in nursery. This research was arranged in Completely Randomized Design (CRD) with 22 pohon indukes and 5 replications. Each replication comprises 9 seedlings. Totally, there are 990 seedlings. The results showed that high genetic variation have effected observed traits of binuang seedlings. It showed by the high genetic variation of height, diameter and sturdiness quotient among binuang mother trees. Seedlings having the high value of diameter and height value of seedlings at all observation ages were from the same mother namely mother tree 17. Seedlings had the lowest average diameter at all observation ages were from the same mother namely mother tree 6. Whereas, seedlings had the lowest average height at 6 and 10 months were from mother tree 9, 7 and 6. Value of sturdiness quotient of seedlings from all mother trees at 6 and 10 months was above or classified high. Mother tree had the lowest sturdiness quotient at all observation ages was mother tree 19. The value of sturdiness quotient decreased along with increasing the age of binuang seedlings.

Merbau is one of threatened forest genetic resources. Based on IUCN Red List Categories. conservation status of merbau is vulnerable (VU A1cd). Conservation effort of merbau is urgently required to save this species from extinction. Center for Forest Biotechnology and Tree Improvement Yogyakarta had established ex situ conservation plots of merbau in Forest Research in Bondowoso, East Java and Gunung Kidul Yogyakarta. Genetic resources used in those ex situ conservation plots were from seven provenances namely Halmahera Timur, Waigo, Oransbari, Wasior, Nabire, Seram, dan Mandopi/Twanwawi. This research aims to evaluate adaptability, growth and regeneration of merbau plants grown in ex situ conservation plots in Bondowoso dan Gunung Kidul. The ex situ conservation plot in Bondowoso was designed as Randomized Complete Block Design with single factor of provenance. At the ex situ conservation plot in Gunung Kidul each provenance was planted in one block. The results showed that adaptability of merbau plants at ex situ conservation plots in Bondowoso dan Gunung Kidul was good. Growth of height and diameter of merbau plants from several provenances at ex situ conservation plot in Gunung Kidul were better than those in Bondowoso at all observation ages. Height and diameter average of merbau plants at ex situ conservation plots in Bondowoso and Gunung Kidul at one year old were 78.21 cm; 9.58 mm and 97.88 cm; 9.58 mm respectively. Height and diameter average of merbau plants at ex situ conservation plots in Bondowoso and Gunung Kidul at two years old were 95.36 cm; 12.95 mm and 121.14 cm; 19.62 mm respectively Regeneration of merbau has been successful at Gunung Kidul plot. Some of the fallen seeds were then grown to be wildlings. Whereas, regeneration of merbau at ex situ conservation plot in Bondowoso was regarded as not successful.