| 摘要: |
| 对青藏高原东缘高寒草甸风毛菊属的球花雪莲(Saussurea globosa Chen.)、钝苞雪莲(S.nigrescensMaxim.)、羽裂风毛菊(S.pinnatidentata Lipsch.)和林生风毛菊(S.sylvatica Maxim) 4个优势种植物的染色体数目和核型进行了研究。结果表明，球花雪莲的核型公式为2n=2x=32=14m+18sm，属2B型，核型不对称系数为64.8%；钝苞雪莲的核型公式为2n=2x=32=10m+22sm，属2B型，核型不对称系数为66.1%；羽裂风毛菊核型公式为2n=2x=28=24m+4sm，属2B型，核型不对称系数为58.6%；林生风毛菊的核型公式为2n=2x=34=10m+24sm，属3B型，核型不对称系数为64.6%。钝苞雪莲较其他3种风毛菊属植物进化。 |
| 关键词: 高寒草甸 风毛菊属 优势种 核型分析 |
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| 基金项目:甘肃省教委科研项目(041-15);甘肃省科技厅科研项目 (3ZS041-A25-008);甘肃省自然科学基金项目(3ZS051-A25-024) |
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| On karyotypes of four species of Saussurea DC.in the east of Qinghai Tibet Plateau |
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| Abstract: |
| The numbers and the karyotypes of four dominant species of Saussurea DC.were analysed.The results as follows:S.globosa Chen.2n=2x=32=14m+18sm,karyotype belongs to 2B type,the coefficient of karyotype asymmetry is 64.8%;S.nigrescens Maxim.2n=2x=32=10m+22sm,karyotype belongs to 2B type,the coefficient of karyotype asymmetry is 66.1%;S.pinnatidentata Lipsch.2n=2x=28=24m+4sm,karyotype belongs to 2B type,the coefficient of karyotype asymmetry is 58.6%;S.sylvatica Maxim.2n=2x=34=10m+24sm,karyotype belongs to 3B type,the coefficient of karyotype asymmetry is 64.6%. |
| Key words: alpine meadow Saussurea DC. dominant species karyotype analysis |
