【摘要】 本文研究了贵州桫椤Ａｌｓｏｐｈｉｌａｓｐｉｎｕｌｏｓａ（Ｈｏｏｋ）Ｔｒｙｏｎ的核型。结果表明：桫椤的染色体数目为２ｎ＝１３８，核型公式２ｎ＝２Ｘ＝１６ｍ＋２ｓｍ＋８６ｓｔ＋３４ｔ。染色体组中，最长与最短染色体之比为２２∶１，臂比大于２∶１的染色体在染色体组中的比例为零。桫椤的核型属“１Ｂ”核型更多还原

【Abstract】 The karyotype of Alsophila Spinulosa(Hook) Tryon of Guizhou have been investigated The result shows that the chromosomal number of Alsophila Spinulosa (Hook) Tryon is 2n=138,and the karyotype formula is 2n=2X=16m+2sm+86st+34t The chromosomal ratio the longest and the shortest in Genome between 2 2∶1, The ratio of L/S, more than 2∶1 in Genome is zero The karyotype of Alsophila Spinulosa (Hook) Tryon belongs to “1B”更多还原