The yield on 30-year Japanese government bonds struck a record low on Tuesday, as investors fretted over the fallout from Britain's vote to quit the European Union. The 30-year JGB yield fell 4.5 basis points to a record low 0.050 percent. Earlier on Tuesday, the 10-year JGB yield fell to a record low of minus 0.225 percent, and the 20-year JGB yield fell to a record low 0.040 percent.