摘要
对八个杉木不同地理种源进行核型分析,结果表明,其染色体数目均为2n=12,其中广西融水杉木的核型公式为2n=22=22m(2SATs),其他种源第7对染色体为近中着丝粒,核型公式为2n=22=20m(2SATs)+2sm。核型类型为1B,第4对染色体短臂上有一对随体。融水杉木少数分裂相发现有一条B染色体,在研究中发现,同源染色体两成员长度差异对数多(核型杂合程度高)的种源,均系属于优良种源。而差异对数少的种源为一般种源(会同杉木除外),核型杂合程度的高低。可作为判定种源优劣的一种标志。
The karyotypes have been s'udied of 8geographic seed sources of Cunninghamia lanceolata(Lamb.) Hook from Huitong and Jianghua of Hunan province, Yongchuan and Hongya of Sichuan province, Rongshui of Guangxi Zhuang Autonomous Region, Yangxin and Tongshan of Hubei province, and Shaowu of Fujian province. The results show that the chromosome number of all the experimental materials is 2n=22. The karyotype formula of Rongshui provenance is K(2n)=22=22m(2SATs), and that of the others is K(2n)=22=20m(2SATs)+2sm. All of the karyotypes belong to '1 B' type according to the classification of Stebbins, The chromosome 7 of Rongshui provenance is metacentric, but that of the others is submetacentric. There is no B-chromosome in all the seed sources except for a few cells of Rongshui provenance in which there is one B-chromosome. All of the materials have satellites in the short arms of the chromosome 4. They can be divided into two groups according to the homogeneity of the length between homologous chromosomes. The first group is more homologous in the length between two numbers of each of most chromosome pairs. It includes Tongshan, Huitong and Shaowu. The second is more heterologous. It includes the rest seed sources. The seed sources of the first group are ordinary except for Huitong. Those of the latter are superior, Determination of chromosome orders as well as identification and selection of superior provenances are discussed.
出处
《中南林学院学报》
CSCD
1992年第1期11-17,共7页
Journal of Central South Forestry University
基金
国家自然科学基金
关键词
杉木
地理种源
染色体
核型
Cunninghamia lanceolata, geographic seed source, karyotype
