十大花色中原牡丹传统品种核型分化程度

Karyotypes and Chromosomal Differentiation in Cultivars of Tree Peony(Paeonia suffruticosa)

以十大花色的30个中原牡丹传统品种为材料,采用常规制片法观察染色体特征,并根据Stebbins的核型进化理论和分支系统学的编序、赋值方法,对核型的4个重要性状进行了分析,结果表明:30个中原牡丹传统品种均为二倍体(2n=10);且核型类型较原始,以2A型为主;核型以2n=10=6m+2sm+2st为主。‘银粉金鳞’、‘洛阳红’、‘璎珞宝珠’的核型较进化,而‘宫样妆’、‘一品朱衣’和‘赤龙焕彩’较原始。核型参数的重要性排列顺序为臂比均值>核型不对称系数>染色体最长/最短值>臂比大于1.7的比例。花色间的核型差异不显著,相近色系的品种进化程度相近,深色系比浅色系原始。

30 traditional cultivars of Paeonia suffruticosa with 10 squash method was used to analyze the features of chromosome. different colors were selected as materials, and the According to Stebbins theory of karyotypic evolution as well as using the method of coding of cladistics, 4 significant characters were analyzed. The results suggested that all the materials were diploid, 2n = 10 ; the karyotypes mostly were 2A, and most was primitive type; the karyotype formulas mostly were 2n = 6m ＋ 2sm ＋ 2st. The chromosomal differentiation of ＇ Yin Fen Jin Lin＇ , ＇ Luo Yang Hong＇ and ＇ Ying Luo Bao Zhu＇ was high, and that of ＇ Gong Yang Zhuang＇ , ＇ Yi Pin Zhu Yi＇ and ＇ Chi Long Huan Cai＇ was low. The importance of karyotype parameters was A. A. R 〉 A. sk% 〉 Lt/St 〉 P. C. A%. The karyotypes were similar among different flower colors. The cultivars of the same color system had similar evolution levels, and the darker colors were more evolutional than the lighter ones. This research could provide some references for the study on evolution of traditional cuhivars of P. suffruticosa