No, GameCube games are Region Locked, and therefore, a NTSC game will not work on a PAL system, that goes for either GameCube or Wii games.
Either you hack your Wii and install an unlocking software, or you downgrade your Wii and buy the Freeloader for Nintendo Wii (by Codejunkies/Datel, found on some online stores), however as both methods are illegal, you must downgrade your system and don't update it in the future. It is a matter of searching around, but you can't play other region's games on your PAL console.