| 摘要: |
| 该研究首次报道了滇羽叶菊和台湾刘寄奴的染色体数据。结果表明:两者的染色体数量都为48,核型公式均为2n=2x=36m + 10sm + 2st,与前人报道的刻裂羽叶菊的核型稍有不同。两者的染色体形态均由大到小逐渐变化,核型二型性不明显,但前者染色体明显比后者大。这说明羽叶菊属染色体基数确实应为x=24,且染色体大小在种间有较大差异。细胞学证据表明,该属与蒲儿根属中染色体基数为x=24的类群以及狗舌草属确实近缘。 |
| 关键词: 染色体基数, 菊科, 细胞学, 核型, 羽叶菊属 |
| DOI：10.11931/guihaia.gxzw201702034 |
| 分类号:Q944 |
| 文章编号:1000-3142(2017)10-1330-05 |
| Fund project:国家自然科学基金(31500166)[Supported by the National Natural Science Foundation of China(31500166)]。 |
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| Cytological study and systematic significance of two species in Nemosenecio (Compositae: Senecioneae) |
|
WANG Long-Yuan3, TANG Ming1, 2*
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1. College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China;2. Key Laboratory for Bamboo Germplasm Resources
and Utilization, Nanchang 330045, China;3. State Key Laboratory of Biocontrol and Guangdong Key Laboratory
of Plant Resources, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China
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| Abstract: |
| Nemosenecio yunnanensis and N. formosanus, chromosomal dates of two species in Nemosenecio, are reported for the first time herein. The results showed that both of these two species have 48 chromosomes, with their karyotypes being 2n=2x=36m + 10sm + 2st, which are somewhat different from that of N. incisifolius previously reported. The chromosomes of the both two species showed a steady gradation from the longest to the shortest in length, with no evidence of bimodality, while the chromosomes size of the former are obviously much bigger than those of the latter. The results confirm that x=24 should be the basic chromosome number in Nemosenecio, and also reveal that the genus Nemosenecio is indeed closely relative to those species with x=24 as the basic chromosome number in Sinosenecio and Tephroseris at geneal level. |
| Key words: basic chromosome number, Compositae, cytology, karyotype, Nemosenecio |
