中国桤木属植物的细胞学研究(Ⅰ)

Cytological study on Alnus in China (1)

对桦木科桤木属自然分布于中国西南地区的4个种进行了细胞学研究,结果分别为:川滇桤木K(2n)=56=30m+24sm+2st;桤木K(2n)=56=38m+16sm+2M;蒙自桤木K(2n)=56=28m+26sm+2st;毛桤木K(2n)=56=42m+14sm;其中川滇桤木的核型属于2A型,其余均为2B型;上述种类染色体数目均为2n=56。4种材料的核型均为首次报道。

Cytological studies of four Alnus species distributed in Southwest China were carried out. The chromosome number of A. nepalensis was 56,not consistent with 28, the previous reported number. The chromosome numbers of three other species（A, ferdinandi-coburgii,A, cremastogyne,A, lanata）and the karyotypes of the four Alnus species were reported for the first time. The karyotype formulas of them were as follows：A. ferdinandi-coburgii K（2n）=56=30m＋24sm＋2st,belonging to ＂2A＂of Stebbins;A. cremastogyne K（2n）= 56=38m＋16sm＋2M;A. nepalensis K（2n） =56=28m＋26sm＋2st;A. lanata K（2n） =56=42m＋14sm; the latter three species belong to＂2B＂of Stebbins.