Surian Toona sinensis Roem is one of the most widely planted species in Indonesia. This study aimed to esmate the gene c diversity between a number of surian popula ons in a progeny test using RAPD markers, with the goal of proposing management strategies for a surian breeding program. Ninety-six individual trees from 8 popula ons of surian were chosen as samples for analysis. Eleven polymorphic primers (OP-B3, OP-B4, OP-B10, OP-H3, OP-Y6, OP-Y7, OP-Y8, OP-Y10, OP-Y11, OP-Y14, and OP-06) producing reproducible bands were analyzed for the 96 trees, with six trees per family sampled. Data were analyzed using GenAlEx 6.3, NTSYS 2.02. The observed percentage of polymorphic loci ranged from 18.2% to 50%. The mean level of gene c diversity among the surian popula ons was considered to be moderate (He 0.304). Cluster analysis grouped the genotypes into two main clusters, at similarity levels of 0.68 and 0.46. The first two axes of the PCoA explained 46.16% and 25.54% of the total varia on, respec vely. The grouping of samples into clusters and subclusters did not correspond with family and their distances, but the grouping was in line with the gene c distances of the samples.

Toona sinensis Roem or surian, belongs to the family Meliaceae. It is very important Indonesia community forest tree species because of it excellent wood quality and medicinal properties. The study investigated the mating system of T. sinensis. T. sinensis base on 88 polymorphic band Random Amplified Polymorphic DNA (RAPD) of 200 tree sample. Origin of geographical location and materials used in this research from Enrekang seed stand identified population, South Sulawesi Province. The mating parameter estimated using the mix mating model showed that this population practice a mixture of mating model with multilocus outcrossing rate (t m) was 0.938, meaning that the total of outcrossing that can be among relative individual or not. The singlelocus outcrossing rate (t s) was 0.765, meaning that most outcrossing occurred among non-relative tree than among relative ones (t m-t m)= 0,172. Highest value was obtained for correlation of selfing among families (0.999±0.045), but low value obtained for correlation paternity multilocus (0.076±0.016) and correlation paternity singlelocus (-0.002±0.062). Maternal inbreeding coefficient (F m)was0.032, meaning high category. From inbreed crossing 0,062 (s=1-t m) was because selfing. Therefore we can concluded that T. sinensis is low tolerance of selfing. These result have important implication to establish strategies of genetic breeding strategic of surian.