The Karyptype Analysis of Triploid Poplar

This paper analyzed the karyotypes of 4 species of triploid poplar. The results were as follows: Populus tomentosa, 2n=3x=57=1 M+31 m+10 sm+15 st; P.×euramericana cv. ’I-214’, 2n=3x=57=2 M+33 m(2 SAT)+10 sm(1 SAT)+10 st(3 SAT)+2 t; P. euramericana cv. Wuhei-1, 2n=3x=57=2 M+38 m(4 SAT)+14 sm(2 SAT)+3 st; P. shanhaiguanensis×(P. simonii×P. pyramidalis-12+Ulmus pumila), 2n =3x=57=35 m+(10 sm)(1 SAT)+(10 st)(2 SAT)+2 t(1 SAT). The results of karyotype analysis showed significant differences between species in triploid P. tomentosa and P.×euramericana. This indicated that their geneone structure and origin were different. This study provided valuable reference for the research of origin and evolution of triploid poplar.