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作 者 ：李林初

期 刊 ：云南植物研究 1991年 13卷 03期 页码：1-3

关键词：长苞铁杉；核型；分类学意义；

Keywords:Tsuga longibracteata,

摘 要 ：本文首次分析了特产我国的长苞铁杉亚属(Subgen.Paleotsuga)的代表种长苞铁杉Tsuga longibracteata的核型，它全由中部和近中部着丝粒染色体组成，核型公式为K(2n)=24=22m十2sm，属“1A”类型。第12号染色体具“长着丝点区域”。染色体相对长度组成为2n=12M2＋10M1+2S。作者发现铁杉亚属(Subgen.Tsuga)植物的核型全为“2A”类型。胞核学资料支持对长苞铁杉亚属和铁杉亚属的划分并表明前者（长苞铁杉）较为原始。长苞铁杉应隶于长苞铁杉亚属、长苞铁杉组。

Abstract:The present paper deals with the karyotype analysis of Tsuga longibracteata Cheng endemic to China, which is a represent species of subgen. Paleotsuga, for the first time. The somatic chromosomes in root -tip cells of the plant are found to be 2n=24, all with median and submedian constrictions. The 12th chromosome of the karyotype has a long centromere region.

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