横断山及邻近地区八种菊科植物的染色体数目及核型

doi:10.7677/ynzwyj201313057

摘要/Abstract

摘要：

对横断山及邻近地区风毛菊属(Saussurea)、帚菊属(Pertya)和针苞菊属(Tricholepis)的8种菊科植物进行细胞学研究，其中异叶帚菊(Pertya berberidoides) (2n=2x=32=28m+4sm)、针苞菊(Tricholepis furcata) (2n=2x=32=16m+16sm)、中甸风毛菊(Saussurea dschungdienensis) (2n=2x=30=30m+Bs)、丽江风毛菊(S.likiangensis) (2n=2x=32=26m+6sm)、倒齿风毛菊(S.retroserrata) (2n=2x=32=14m+18sm)和显梗风毛菊(S.peduncularis) (2n=2x=36=26m+10sm)为首次报道染色体数目和核型，长毛风毛菊(S.hieracioides)和三角叶风毛菊(S.deltoidea)的核型公式分别为：2n=4x=64=30m+34sm和2n=2x=34=22m+12sm，与前人报道的一致。8种植物中，除中甸风毛菊和异叶帚菊的核型不对称性为1B型外，其余6种的核型不对称性均属于2B型；在中甸风毛菊中首次发现B染色体。结合现有的细胞学资料分析表明，风毛菊属和帚菊木族的染色体数目存在变异，并且存在明显的非整倍性；此外，分布于横断山区的风毛菊属植物仅有两种倍性(二倍体和四倍体)，而且多倍化并不占主导地位。

关键词: 风毛菊属, 帚菊属, 针苞菊属, 核型, 染色体数目

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

中图分类号:

Q 943

陈光富1, 巴罗菊1, 孙文光1, 娄笑1, 张建文2, 李志敏1. 横断山及邻近地区八种菊科植物的染色体数目及核型[J]. Plant Diversity, 2013, 35(3): 367-374.

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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