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

doi:10.7677/ynzwyj201313057

Abstract

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

CHEN Guang-Fu-, BA Luo-Ju-, SUN Wen-Guang-, LOU Xiao-, ZHANG Jian-Wen-, LI Zhi-Min. Karyotypes and Chromosome Numbers of Eight Species from the Family Asteraceae in the Hengduan Mountains and the Adjacent Regions[J]. Plant Diversity, 2013, 35(3): 367-374.

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