白楠和闽楠染色体核型分析  

Analysis of chromosome karyotypes in Phoebe neurantha and P. bournei

作　　者：刘玉香[1] 宋晓琛[2] 江香梅[1,2] 

机构地区：[1]江西农业大学园林与艺术学院,江西南昌330045 [2]江西省林业科学院国家林业局樟树工程技术研究中心,江西南昌330032

出　　处：《南京林业大学学报（自然科学版）》2013年第5期157-160,共4页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家林业公益性行业科研专项项目(201004073);江西省财政重大科研专项项目(2011510101)

摘　　要：采用染色体常规压片法,对白楠(Phoebe neurantha)和闽楠(P.bournei)的染色体进行了观察分析,结果表明:白楠的染色体数目为2n=24,其核型公式为K(2n)=2x=24=20m+4sm,染色体相对长度组成为6L+4M2+10M1+4S,核不对称系数为57.58%;闽楠染色体数目为2n=24,核型公式为K(2n)=2x=24=24m,染色体相对长度组成为6L+4M2+12M1+2S,核不对称系数为54.96%。两者均为二倍体,染色体主要由中部和近中部着丝点染色体组成。白楠属于Stebbins核型分类中的"2B"型,闽楠为"2A"型。The chromosomes in Phoebe neurantha and P. bournei were detected and analyzed by common squash and mi- crophotography methods. The results indicated that the number of the somatic chromosome in P. neurantha was 2n = 24, and its karyotype formula was K（2n） = 2x = 24 = 20m ＋ 4sm, the constitution of relative length of chromosome was 6L ＋ 4M2 ＋ 10M~ ＋4S, and the asymmetry index was 57.58%. The number of the somatic chromosome in P. bournei was 2n =24, and its karyotype formula was K（2n） =2x = 24 =24m; the constitution of relative length of chromosome was 6L ＋4M2 ＋ 12M1 ＋2S; the asymmetry index was 54.96%. The chromosomes of the two species were diploid, and were mainly metacentric and submetacentric. Based on the Stebbins＇ classic method, the karyotype of P. neurantha belongs to ＂2B＂ type, and the P. bourneiis belongs to ＂2A＂ type.

关 键 词：白楠 闽楠 染色体 核型分析 

分 类 号：Q949.747.5[生物学—植物学] S722[农业科学—林木遗传育种]