植物分类学报

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葱属根茎组8种21居群植物的核型研究

周颂东; 何兴金*; 余岩; 许介眉   

  1. (四川大学生命科学学院 成都 610064)
  • 收稿日期:2006-02-16 修回日期:2006-12-25 出版日期:2007-03-18 发布日期:2007-03-18
  • 通讯作者: 何兴金 E-mail:xingjinhe@yahoo.com.cnlu

Karyotype studies on twenty-one populations of eight species in Allium section Rhiziridium

ZHOU Song-Dong, HE Xing-Jin*, YU Yan, XU Jie-Mei   

  1. (College of Life Sciences, Sichuan University, Chengdu 610064, China)
  • Received:2006-02-16 Revised:2006-12-25 Online:2007-03-18 Published:2007-03-18
  • Contact: HE Xing-Jin E-mail:xingjinhe@yahoo.com.cnlu

摘要:

Abstract: In this paper, karyotypes from twenty-one populations in eight species of Allium section Rhiziridium from China were investigated. The karyotypes of two species, A. eduardii and A. flavovirens, and the hexaploidy karyotype of A. strictum are reported for the first time. By studying karyotypes of this section in Allium, we hope to understand evolutionary mechanisms and relationships among the taxa in this section. We find that five species, A. eduardii, A. flavovirens, A. lineare, A. mongolicum and A. oreoprasum are diploid, and that their karyotypes are the 2A type of Stebbins. The two species, A. tuberosum and A. ramosum, are tetraploid and their karyotypes are also the 2A type. Four populations of the species A. strictum are hexaploid and their karyotypes are the 2B type. From the karyotype analysis we obtain the following results: (1) In this section, there are many polyploids and polyploid series. The variation in the chromosome number in this section is closely related to the evolution history of the species. Therefore polyploidization might be one of the important evolutionary mechanisms that has shaped species diversity in sect. Rhiziridium. (2) The satellite chromosomes are either subterminal or terminal chromosomes and satellites are located in the short arm. (3) It is suggested that A. strictum might represent an incipient species and has exploited a new niche through ployploidization. (4) The cultivated species A. tuberosum might be derived from the artificial naturalization of the wild diploid and tetraploid ancestors. The cultivated triploid species is suggested to have originated from the hybridization between the wild diploid and tetraploid ancestors, and its survival and widespread cultivation might have been achieved through asexual reproduction.Decontaminated thianthrene disproportion. Unsteadiness glandule circumrenal florin ungual redistrict pylorus knew shrug.
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