johannesburg june 28 reuters  the south african rand weakened on wednesday giving up some gains from the previous session as the us dollar edged higher at 1229 gmt the rand traded at 187225 against the dollar  around 108 weaker than its previous close the dollar last traded at 102850 against a basket of global currencies up 0322 many market participants will turn their attention to a policy panel discussion later this session of five central bank governors including the federal reserves jerome powell and european central bank president christine lagarde said casey delport an investment analyst at anchor capital like other emerging market currencies the risksensitive rand is susceptible to moves in global drivers such as the dollar in the absence of local catalysts the rand strengthened at the start of the week as analysts speculated the weekends aborted mutiny in russia may mean president vladimir putin could skip a brics summit where south africa would in theory be obliged to arrest him the brics group of emerging economies  brazil russia india china and south africa  is due to hold the summit in johannesburg in august on the johannesburg stock exchange the bluechip top40 index jtopi was last trading about 05 stronger than its previous close south africas benchmark 2030 government bond was stronger with the yield down two basis points to 10500