PDR 2013, 35(3) 355-360 DOI:   10.7677/ynzwyj201313035  ISSN: 2095-0845 CN: 53-1217/Q

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Keywords
Leontopodium
Qinghai-Tibet Plateau
Chromosome number
Karyotype
Polyploidy
Authors
WANG Guang-Yan-1、2、4
MENG Ying-1、2、3
NIE Ze-Long-1
YANG Yong-Ping-1、2、3
PubMed
Article by Wang, G. Y. 1、2、4
Article by Meng, Y. 1、2、3
Article by Nie, Z. L. 1
Article by Yang, Y. P. 1、2、3

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 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

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.

Keywords Leontopodium   Qinghai-Tibet Plateau   Chromosome number   Karyotype   Polyploidy  
Received 2013-03-14 Revised  Online: 2013-04-11 
DOI: 10.7677/ynzwyj201313035
Fund:

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)

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