Chromosome numbers and polyploidy in Leontopodium (Asteraceae: Gnaphalieae) from the Qinghai-Tibet Plateau of S.W. China

Leontopodium R. Br. ex Cass. is the second largest genus within the Asian Gnaphalieae (Asteraceae) and is most diversified on the Qinghai-Tibet Plateau and its adjacent areas of SW China. The chromosome numbers and karyomorphology of five species from this region were investigated for the first time: Leontopodium sinense (2n = 28 = 22m + 6sm), L. muscoides (2n = 24 = 22m + 2sm), L. souliei (2n = 52 = 32m + 20sm), L. pusillum (2n = 72 = 52m + 20sm), and L. nanum (2n = 48 = 24m + 24sm). The results suggest that the basic chromosome number of Leontopodium is x = 14, followed with dysploidy numbers (e.g. x = 12, 13). Polyploidization has also played an important role in the evolution of Leontopodium in this region.

[1]  I. Breitwieser,et al.  Ancient allopolyploidy in the everlasting daisies (Asteraceae: Gnaphalieae): Complex relationships among extant clades , 2011 .

[2]  H. Stuppner,et al.  Phylogenetic relationships in the genus Leontopodium (Asteraceae: Gnaphalieae) based on AFLP data. , 2011, Botanical journal of the Linnean Society. Linnean Society of London.

[3]  A. Susanna,et al.  How many of Cassini anagrams should there be? Molecular systematics and phylogenetic relationships in the Filago group (Asteraceae, Gnaphalieae), with special focus on the genus Filago , 2010 .

[4]  F. Attar,et al.  New chromosome counts in the genus Cousinia (Asteraceae, Cardueae) from Iran , 2010 .

[5]  Tod F. Stuessy,et al.  MOLECULAR PHYLOGENY OF THE EDELWEISS ( LEONTOPODIUM , ASTERACEAE – GNAPHALIEAE) , 2010 .

[6]  A. Levan,et al.  NOMENCLATURE FOR CENTROMERIC POSITION ON CHROMOSOMES , 2009 .

[7]  Sumei Chen,et al.  Chromosome numbers and morphology of eighteen Anthemideae (Asteraceae) taxa from China and their systematic implications , 2009 .

[8]  L. Rieseberg,et al.  Plant Speciation , 2007, Science.

[9]  S. Ghaffari,et al.  New chromosome counts in the genus Cousinia (Asteraceae) from Iran , 2006 .

[10]  Hang Sun,et al.  POLYPLOIDY IN THE FLORA OF THE HENGDUAN MOUNTAINS HOTSPOT , 2005 .

[11]  S. Ghaffari,et al.  New chromosome counts in the genus Cousinia and the related genus Schmalhausenia (Asteraceae, Cardueae) , 2003 .

[12]  N. Garcia‐Jacas,et al.  New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan , 2001 .

[13]  N. Garcia‐Jacas,et al.  New or rare chromosome counts in the genera Artemisia L. and Mausolea Bunge (Asteraceae, Anthemideae) from Uzbekistan , 2001 .

[14]  K. Kosuge,et al.  Molecular systematics of Australian Podolepis (Asteraceae: Gnaphalieae): evidence from DNA sequences of the nuclear ITS region and the chloroplast matK gene , 2000 .

[15]  T. Nishikawa.  Chromosome Counts of Flowering Plants of Hokkaido (21) , 2000 .

[16]  R. Mittermeier,et al.  Biodiversity hotspots for conservation priorities , 2000, Nature.

[17]  J. Wen.  Evolution of Eastern Asian and Eastern North American Disjunct Distributions in Flowering Plants , 1999 .

[18]  A. Susanna,et al.  Aneuploidy in the Centaureinae (Compositae) : is n = 7 the end of the series? , 1996 .

[19]  J. Dewey,et al.  The tectonic evolution of the Tibetan Plateau , 1988, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[20]  Michael P. Klimetz.  An outline of the plate tectonics of China: Discussion and reply , 1985 .

[21]  R. Coleman,et al.  An outline of the plate tectonics of China: Discussion and reply , 1984 .

[22]  C. Stace.  Plant taxonomy and biosystematics , 1981 .

[23]  Á. Löve.  IOPB CHROMOSOME NUMBER REPORTS LXIV , 1979 .

[24]  Jeffrey B. Harborne,et al.  The Biology and Chemistry of the Compositae , 1978 .

[25]  Á. Löve.  IOPB CHROMOSOME NUMBER REPORTS LVII , 1977 .

[26]  Á. Löve.  IOPB chromosome number reports. , 1964 .

[27]  T. Whitaker.  THE GEOBOTANICAL SIGNIFICANCE OF POLYPLOIDY , 1951 .

[28]  D. Love,et al.  The geobotanical significance of polyploidy. I. Polyploidy and latitude. , 1951 .

[29]  K. Kosuge,et al.  Chromosome numbers and karyotypes in the Australian Gnaphalieae and Plucheeae (Asteraceae) , 1999 .

[30]  Sajid Ali,et al.  Chromosome Numbers in Compositae from Pakistan , 1988 .

[31]  P. Zhukova.  Chromosome numbers of some Southern Chukotka plant species , 1980 .

[32]  R. Tanaka.  Types of Resting Nuclei in Orchidaceae , 1971 .

[33]  G. Ledyard Stebbins,et al.  Chromosomal evolution in higher plants , 1971 .