植物分类学报

• 研究论文 • 上一篇    下一篇

中国悬钩子属空心莓组与木莓组28种和变种的核型比较研究

王小蓉; 汤浩茹*; 段娟; 李玲   

  1. (四川农业大学林学园艺学院 四川雅安 625014)
  • 收稿日期:2007-05-28 修回日期:2007-09-17 出版日期:2008-07-18 发布日期:2008-07-18
  • 通讯作者: 汤浩茹 E-mail:htang@sicau.edu.cn

A comparative study on karyotypes of 28 taxa in Rubus sect. Idaeobatus and sect. Malachobatus (Rosaceae) from China

Xiao-Rong WANG; Hao-Ru TANG*; Juan DUAN; Ling LI   

  1. (College of Forestry and Horticulture, Sichuan Agricultural University, Ya’an, Sichuan 625014, China)
  • Received:2007-05-28 Revised:2007-09-17 Online:2008-07-18 Published:2008-07-18
  • Contact: Hao-Ru TANG E-mail:htang@sicau.edu.cn

Abstract: Rubus is a taxonomically difficult group and cytological data are expected hopefully to gain insight into the relationships of the genus. In this study the chromosome numbers and karyotypes of 18 taxa from sect. Idaeobatus and 10 taxa from sect. Malachobatus were investigated. Among them, the chromosome numbers of 10 taxa and karyotypes of 26 taxa were reported for the first time and mixoploidy was observed new in the genus. The chromosomes are small in size with a length of less than 3 µm and metacentric (about 90%) or submetacentric. All taxa have karyotypes of “1A” except R. cockburnianus, R. innominatus and R. ellipticus var. obcordatus, which have karyotypes of “2A”. No aneuploids were found in all the 28 taxa studied. Plants of sect. Idaeobatus have diploids with 2n=2x=14, except R. idaeopsis (2n=3x=21) and R. parvifolius (A mixoploid of 2n=2x=14 and 2n=4x=28). However, plants of sect. Malachobatus have tetraploids with 2n=4x=28, except for R. buergeri with 2n=8x=56. In addition, conspicuous karyotype differences existed within the 18 taxa belonging to 11 of 7 subsections in sect. Idaeobatus, and the differences between some species within subsections are greater than that between subsections, while uniform karyotypes within subsections and variable karyotypes between subsections were observed in six of 13 subsections in sect. Malachobatus represented by 10 taxa. Systematic values of the cytological data were discussed for some cases when applicable to the two sections.

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