Plant Diversity ›› 2013, Vol. 35 ›› Issue (3): 367-374.doi: 10.7677/ynzwyj201313057

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Karyotypes and Chromosome Numbers of Eight Species from the Family Asteraceae in the Hengduan Mountains and the Adjacent Regions

CHEN  Guang-Fu-1, BA  Luo-Ju-1, SUN  Wen-Guang-1, LOU  Xiao-1, ZHANG  Jian-Wen-2, LI  Zhi-Min-1   

  1. 1 School of Life Sciences of Yunnan Normal University, Kunming 650500, China; 2 Key Laboratory of Biodiversity
    and Biogeography, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
  • Received:2013-03-22 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); 国家基金委-云南省联合基金重点项目 (U1136601); 国家自然科学基金委员会资助项目 (31160229); 云南省科技计划 (2011FZ083)

Abstract:

 Chromosome numbers and karyotypes of 8 species of Saussurea, Pertya and Tricholepis from Hengduan Mountains with neighborhood were studied. The chromosome numbers and karyotype were reported firstly for Pertya berberidoides (2n=2x=32=28m+4sm), Tricholepis furcate (2n=2x=32=16m+16sm), Saussurea dschungdienensis (2n=2x=30=30m+Bs), S.likiangensis (2n=2x=32=26m+6sm), S.retroserrata (2n=2x=32=14m+18sm), and S.peduncularis (2n=2x=36=26m+10sm). The chromosome numbers and ploidy of S.hieracioides with 2n=4x=64=30m+34sm and S.deltoidea with 2n=2x=34=22m+12sm are consistent with previously report. All species have type 2B karyotype asymmetry, except for Saussurea dschungdienensis and Pertya berberidoides having type 1B. B chromosome was first discovered in Saussurea dschungdienensis. The results showed that the genus Saussurea and the tribe Mutisieae have a wide range of chromosome numbers and obvious aneuploidy. In addition, only diploid and tetraploid were found in Saussurea from Hengduan Mountains, and polyploidization might have played a minor role in the chromosomal evolution of the Saussurea in the Hengduan Mountains.

Key words: Saussurea, Pertya, Tricholepis, Karyotype, Chromosome number

CLC Number: 

  • Q 943