Preheat oven to 400°.
Lightly spoon flours into dry measuring cups; level with a knife. Combine flours, 1/2 cup sugar, baking powder, baking soda, and salt in a large bowl. Combine strawberries, yogurt, butter, rind, and egg white; add to flour mixture, stirring just until moist.
Turn dough out onto a lightly floured surface; knead lightly 4 times with floured hands. Pat into an 8-inch circle on a baking sheet coated with cooking spray. Cut into 12 wedges, cutting into but not through dough; sprinkle with 2 teaspoons sugar. Bake at 400° for 20 minutes or until lightly browned.