银白杨×白榆为科间远缘杂交,由于亲本间的遗传和生理机制差异,造成生殖隔离,产生不育或败育现象。1978～79年,我们曾把败育种胚采用子房离体培养法,成功地获得银白杨×白榆(以下简称为银×榆)6株F_1代的完整植株,经过扩繁于1980年5～7月移入田间定植,现共保留42株。通过几年来的试验,观察到银×榆F_1有较高的杂种 Poplar × elm elm for distant hybridization between families, due to genetic and physiological differences between parents, resulting in reproductive isolation, resulting in infertility or abortion. From 1978 to 1979, we successfully used the ovary in vitro culture method to get aborted embryos, and successfully obtained 6 F 1 generation plants of Poplar × elm (hereinafter referred to as silver × elm), which were expanded in 1980 5 ~ July into the field planting, a total of 42 reserved. Through years of experimentation, silver × elm F_1 was found to have higher hybrids