<![CDATA[The study was conducted to investigate the existence of  family à site  interactions observed in  second generation  open-pollinated progeny test  of Acacia mangium in two locations: Lipatkain, Riau (Sumatra) and Kenangan, East Kalimantan. The progeny tests were  established  using 51-55 families originated  from Oriomo River Papua New Guinea  provenance. There were 31common families tested at the both sites. Growth on both sites was significantly different between families. The average height  and diameter was 15,9 m and 13,3 cm  respectively at  Kenangan, and  17,0 m and  16,6 cm  respectively at  Lipatkain. Family à site interactions were  highly significant for height and diameter. The ratio of variance component of interaction to the family variance component (s2fl / s2f ) for  diameter (1,6) and height (1,2) were largerr than Shelbourneâs  critical value (0,5),    indicating the low  genotypic stability at family level for the both traits  where the diameter was  more sensitive than height to changing  site conditions. Genetic correlations between the same trait at different sites were low:  0.45 for height  and 0.38 for diameter. The greatest genetic gain and relative efficiency of family selection were generally expected from selecting and planting families in the same site.]]>
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