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对银白杨(Populus alba)×[白榆(Ulmus pumila)+新疆杨(P.alba var.pyramidalis)失活花粉]的亲本和子代进行了核型分析。结果表明:银白杨,2n=38=1M+30m(1SAT)+4sm+1st+2t;银榆杨(P.×alba L.‘yinyu’)1号,2n=38=1M+30m(1SAT)+4sm+1st+2t;银榆杨2号,2n=38=1M+30m(2SAT)+4sm+1st+2t。白榆的染色体2n=28。银白杨和银榆杨的染色体数目相同,核型差异很小。随体的数量可能与银榆杨和银白杨表型不同有关。推测,银白杨×白榆的杂种胚在发育时先形成了以银白杨染色体为主的单倍体,后经染色体自然加倍形成二倍体银榆杨。
Karyotype analyzes were performed on parents and offspring of Populus alba × Ulmus pumila + P.alba var.pyramidalis inactivation pollen. The results showed that: P. alba L. 2n = 38 = 1M + 30m (1SAT) + 4sm + 1st + 2t; P. alba L.’yinyu ’No.1, 2n = 38 = 1M + 30m (1SAT) + 4sm + 1st + 2t; silver Yu Yang 2, 2n = 38 = 1M + 30m (2SAT) + 4sm + 1st + 2t. Elm chromosome 2n = 28. Populus tomentosa and Yin Yu Yang the same number of chromosomes, karyotype difference is small. The number of accompanying bodies may be related to the different phenotypes of silver elm and poplar. Speculated that the hybrid poplar × white elm seed embryos in the development of the formation of the haplotypes dominated by silver poplar, after the natural chromosome doubling to form diploid Yin Yu.