Fig. 3From: Carbohydrate metabolism and fertility related genes high expression levels promote heterosis in autotetraploid rice harboring double neutral genesClassification of chromosome configuration. a1–a4 represent ring shape, b1–b4 represent chain shape, c1–c4 represent frying pan shape, d1–d4 represent “X” shape, e1–e4 represent “OK” shapeBack to article page