摘要
本文研究了北京地区栎属(Quercus Linn.)中的北京槲栎(Quercus aliena var.pekingensis Schott.)、锐齿槲栎(Q.aliena var.acuteserrata Maxim.)、辽东栎(Q.liaotungensis Koidz.)、蒙古栎(Q.mongolica Fisch.)、夏栎(Q.robur Linn.)、栓皮栎(Q.variabilis B1.)、麻栎(Q.acutissima Carr.)和槲树(Q.dentata Thunb.)8个种和变种的染色体核型。染色体数目均为2n=24,由中部着丝点染色体和近中部着丝点染色体组成。染色体长度在1.14—3.18微米之间。通过核型分析,将该属8个种(变种)分为三个类型:①栓皮栎型,2n=24=20m+4sm,②夏栎型,2n=24=14m+10sm;③槲栎型,2n=24=22m+2sm。其中3种为首次报道。
This paper studies the chromosome karyotypes of 8 species and varieties of Quercus Linn, (Quercus aliena var. pekingensis Schott.,Q. aliena var, acuteserrata Maxim., Q. liaotungensis Koidz., Q. robur Linn., Q.varia-bilis BL., Q. mongolica Fisch. et Turcz., Q.acutissirna Carr . ,Q .dentata Thunb. ) distributed in Beijing. The chromosomes, consisting of metacen-tric and sub-metacentric chromosomes, are arranged in all of the species and varieties as 2 n = 24. The chromosomes vary from 1.14μ to 3.18μ in length. On the basis of karyotype analysis the 8 species can be divided into 3 types. 1, Q. variabilis-2 n = 24 = 20m+ 4 sm; 2. Q. robur-2n = 24=14m+10sm; 3. Q. aliena- 2 n = 24 = 22m+ 2 sm.
