| 落叶松属的核型及系统位置的研究 |
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| 引用本文： | 李林初.落叶松属的核型及系统位置的研究[J].中国科学院研究生院学报,1993,31(5):405-412. |
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| 作者姓名： | 李林初 |
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| 摘 要： | 本文分析了我国特产树种红杉Larix potaninii的核型，K(2n)=24=12m+8sm+4st，属2A类型，染色体相对长度组成为2n=24=4L+8M2+8M1+4S。落叶松属植物(10种)的核型由6对较长的中部着丝粒染色体和6对较短的、臂比大于2的近中或近端着丝粒染色体构成，这是较为进化的核型，其中红杉组Sect．Multiserales则似有比落叶松组Sect．Larix更进化的趋势。根据松科各属核型的比较，作者发现落叶松属和黄杉属非常近缘而与其他属较为疏远，因此由它们组成落叶松亚科可能较为合适，这是一个较进化的亚科。该结沦也得到形态学、解剖学、孢粉学、生物化学及古植物学等方面资料的支持。
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| 关 键 词： | 红杉 落叶松属 落叶松亚科 松科 核型 系统学 |
Studies on the Karyotype and Systematic Position of Larix Mill. (Pinaceae) |
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| Li Lin-chu.Studies on the Karyotype and Systematic Position of Larix Mill. (Pinaceae)[J].Journal of the Graduate School of the Chinese Academy of Sciences,1993,31(5):405-412. |
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| Authors: | Li Lin-chu |
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| Abstract: | The present paper reports the karyotype of Larix potaninii Batal.
endemic to China, and discuss classification of Larix and its systematic position in
the Pinaceae based on karyotype and other data. The karyotypic formula of the
species is K(2n)=24= 12m+ 8sm+4st, which belongs to Stebbins’2A type and
the chromosome complement of relative length is 2n=24=4L+8M2+8M1+4S.
The karyotype of the genus Larix (10 species) is composed of six pairs of longer
metacentric chromosomes and six pairs of shorter submetacentric or subtelocentric
chromosomes with arm ratio>2. This karyotype is an advanced one. It seems
that Sect. Multiserales is more advanced than Sect. Larix. On the basis of the
comparison among the karyotypes of pinaceous genera, the author finds that
Larix and Pseudotsuga are much more closely related to each other than any of
them to the others. Therefore, it may be more appropriate to group these two
genera into Subfamily Laricoideae, which is a more advanced one. The conclusion
is also supported by the data from morphology, anatomy, palynology,biochemistry, palaeobotany and so on. |
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| Keywords: | Larix potaninii Larix Laricoideae Pinaceae Karyotype Systematics |
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