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美洲黑杨(Populus deltoides Marsh.)是北美的一个重要杨树种,69杨(P.deltoid-es CV.‘I-69/55’或者 P.deltoides CV.‘L-ux’是意大利从美洲黑杨中选育出的一个优良无性系。各国杨树育种工作者用美洲黑杨与欧洲黑杨杂交培育出许多欧美杨品种,也用美洲黑杨与青杨派树种杂交培育出不少品种。近年来,一些国家对美洲黑杨与青杨派树种的杂交尤为重视,如比利时、新西兰等国用美洲黑杨与毛果杨(P.tricoca-pa)、滇杨(P.yunnanensis)等杂交,选出了一些较好的无性系。我国青杨派树种的种类多,分布广。育种工作者曾用小叶杨(P.simonii)、青杨(P.cathayana)等与欧洲黑杨(P.nigra)
Populus deltoides Marsh. Is an important Poplar species in North America, P. deltoid-es CV.’I-69/55 ’or P.deltoides CV.’L-ux’ is the Italian from the Americas Black poplar bred an excellent clone in various countries, poplar breeders poplar and Populus euphratica to breed a lot of European and American poplar species, but also with the American Poplar and Populus to breed to breed a lot of species .In recent years In recent years, some countries have paid special attention to the hybridization between Populus nigra and Populus simonii. For example, Belgium, New Zealand and other countries cross the Populus nigra with P.tricoca-pa and P.yunnanensis, Selected some better clones .Chinese Populus send tree species more widely distributed.Seed workers have used poplar (P.simonii), Populus (P.cathayana) and Populus tomentosa (P. nigra)