PREHEAT oven to 350° F. Grease and flour 12-cup Bundt pan.
COMBINE cake mix, pumpkin, eggs and orange juice in large mixer bowl. Beat on low speed until moistened. Beat on medium speed for 2 minutes. Add poppy seeds; mix until blended. Pour into prepared Bundt pan.
BAKE for 35 to 40 minutes or until wooden pick inserted in cake comes out clean. Cool in pan on wire rack for 10 minutes; remove to wire rack to cool completely. Drizzle with Glaze.
COMBINE 1 1/2 cups sifted powdered sugar and 2 to 3 tablespoons orange juice in small bowl; stir until smooth.