桦木科两种濒危植物的染色体数目

Chromosome Numbers of Two Threatened Species of Betulaceae

首次对桦木科濒危物种普陀鹅耳枥和天目铁木进行了细胞学研究。普陀鹅耳枥和天目铁木的间期核和有丝分裂前期染色体均分别为复杂染色中心型和中间型;普陀鹅耳枥的染色体数目为2n=14x=112,染色体大小介于0.230μm至0.920μm之间。天目铁木的染色体数目为2n=2x=16,染色体大小为0.468μm至1.150μm。以上研究结果为濒危物种普陀鹅耳枥和天目铁木的物种生物学及其濒危机制的研究提供了细胞学资料。

A cytological study of threatened Carpinus putoensis Cheng and Ostrya reheriana Chun was firstly made in this paper. The interphase nuclei and prophase chromosomes of C. putoensis were categorized to be complex chromocenter type and interstitial type, respectively; the metaphase chromosome number of C. putoensis was reported 2n=14x=112, ranging from (0.920 μm) to 0.230 μm in length. The interphase nuclei and prophase chromosomes of O. reheriana were categorized to be complex chromocenter type and interstitial type, respectively; the metaphase chromosome number of O. reheriana was reported 2n=2x=16, ranging from 1.15 μm to (0.468 μm) in length. These results can supply the cytological evidence for the further research on the biosystermatics and threatened mechanism of C. putoensis and O. reheriana two rare and threatened species of Betulaceae.