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1978年,辽宁省杨树研究所开始进行银白杨×白榆科间远缘杂交试验研究。利用蒙导技术克服远缘杂交障碍、子房离体培养挽救败育幼胚,成功获得了银×榆F1的完整植株。经形态、亲本及子代AFLP标记测试得出,银×榆属于偏母本的融合型杂种,且银×榆具有抗旱、抗虫等优良特性,是一个比较特殊的珍稀物种资源。
In 1978, Poplar Research Institute of Liaoning Province began to carry out distant hybridization experiments between Populus × elmium Branch. Mongolian guide technology to overcome barriers to distant hybridization, ovary in vitro rescue abortion immature embryos, successfully obtained silver × El F1 complete plant. The morphological, parental and offspring AFLP marker test showed that silver × elm belongs to the partial mother of the hybrid hybrids, and silver × elm has drought, insect resistance and other fine features, is a relatively rare resources of rare species.