Combine flour, sugar, baking powder, orange peel, and salt in large bowl. Cut in margarine until mixture looks like fine crumbs; stir in pecans. Combine eggs, milk, vanilla and lemon juice and stir into flour mixture; fold in berries. Pour into greased and floured 10-inch bundt pan. Bake at 350° 1 1/2 hours or until toothpick inserted in cake comes out clean. Cool 10 minutes before removing from pan.