CHAPTER 8 CROSSEREEDIGINICLONAL ROPS 练系亲突育神 BY s Niu Yingze (牛应门 Dept of Plant Breeding and Seed EngineeringCHAPTER 8 CROSS BREEDING IN CLONAL CROPS 营养系杂交育种 BY Niu Yingze （牛应泽） Dept. of Plant Breeding and Seed Engineering