TY - GEN AU - Hammerschlag, F.A. AU - Litz, R.E. TI - Biotechnology of perennial fruit crops T2 - Biotechnology in Agriculture No.8 SN - 0851987087 U1 - 634.04 HAM CY - UK, CAB International KW - Fruit crops- perennial/ fruit crops - protoplasts/ fruit crops - haploidy ER -