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Plant Diversity ›› 2013, Vol. 35 ›› Issue (3): 355-360.DOI: 10.7677/ynzwyj201313035

• 研究论文 • 上一篇    下一篇

青藏高原东南缘五种火绒草属植物的核型

 王广艳1、2、4, 孟盈1、2、3, 聂泽龙1, 杨永平1、2、3   

  1. 1 中国科学院昆明植物研究所生物多样性与生物地理学重点实验室,云南 昆明650201;2 中国科学院昆明
    植物研究所西南野生生物种质资源库,云南 昆明650201;3 中国科学院青藏高原研究所昆明部,
    云南 昆明650201;4 中国科学院大学,北京100049
  • 收稿日期:2013-03-14 出版日期:2013-05-25 发布日期:2013-04-11
  • 基金资助:

    科技部科技基础性工作专项重点项目 (2007FY110100);国家自然科学基金项目 (31270273, 41271058);中国科学院生命科学领域基础前沿专项项目 (KSCX2-EW-J-24);国家重点基础研究发展计划 (2010CB951704)

Karyotypes of Five Leontopodium Species from the Southeastern QinghaiTibet Plateau, Southwest China

WANG  Guang-Yan-1、2、4, MENG  Ying-1、2、3, NIE  Ze-Long-1, YANG  Yong-Ping-1、2、3   

  1. 1 Key Laboratory of Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China;
    2 Plant Germplasm and Genomics Center, China Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy
    of Sciences, Kunming 650201, China; 3 Institute of Tibetan Plateau Research at Kunming, Chinese Academy of Sciences,
    Kunming 650201, China; 4 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2013-03-14 Online:2013-05-25 Published:2013-04-11
  • Supported by:

    科技部科技基础性工作专项重点项目 (2007FY110100);国家自然科学基金项目 (31270273, 41271058);中国科学院生命科学领域基础前沿专项项目 (KSCX2-EW-J-24);国家重点基础研究发展计划 (2010CB951704)

摘要:

报道我国青藏高原东南缘5种6个居群火绒草属植物的染色体数目和核型。银叶火绒草Leontopodium souliei 2n=2x=24=13M+8m+3sm,1B;坚杆火绒草L.franchetii 2n=2x=26=6M+18m+2sm,2A;华火绒草L.sinense;四川木里海拔2406m的居群:2n=2x=26=4M+22m,1B,四川木里海拔3074m居群:2n=4x=52=16M+36m,1B;美头火绒草L.calocephalum 2n=4x=48=3M+43m+2sm,1B;毛香火绒草L.stracheyi 2n=4x=48=13M+35m,1A。对现有的染色体资料分析表明:火绒草属的染色体核型比较对称,但种间具一定的变异;多倍化可能是该属在我国青藏高原及其周边地区发生强烈物种分化的重要原因之一。

关键词: 火绒草属, 青藏高原, 染色体数目, 核型, 多倍体

Abstract:

The chromosome numbers and karyotypes of five species of the genus Leontopodium (Asteraceae) from Southeastern QinghaiTibet Plateau, Southwest China were investigated. Three species were studied karyomorphologically and reported for the first time: L.franchetii 2n=2x=26=6M+18m+2sm, 2A; L.calocephalum 2n=4x=48=3M+43m+2sm, 1B; L.stracheyi 2n=4x=48=13M+35m, 1A. Two species L.souliei and L.sinense presented different chromosome numbers and karyotypes from the previous reports, that is, L.souliei 2n=2x=24=13M+8m+3sm, 1B; L.sinense, the population collected at altitude 2406m a.s.l. Muli County, Sichuan Province: 2n=2x=26=4M+22m, 1B, the population collected at altitude 3074m a.s.l. Muli County, Sichuan Province: 2n=4x=52=16M+36m, 1B. The comparison of existent chromosomal data indicates that Leontopodium is a genus with symmetry karyotype, but diversified obviously among different species. Polyploidization might have played an important role in the speciation and evolution of Leontopodium on the QinghaiTibet Plateau and its southeastern peripheral regions.

Key words: Leontopodium, Qinghai-Tibet Plateau, Chromosome number, Karyotype, Polyploidy

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