作 者 ：Li Lin-Chu
期 刊 ：植物分类学报 1990年 1期
关键词：杉科核型演化路线；
Keywords:Taxodiaceae, Karyotype, Evolutionary line,
Abstract:
According to the karyotypic data the present author proposes two evolutio-
nary lines, A and L (Fig. 1), in Taxodiaceae (Exclud. Sciadopitys). The former is characteri-
zed by a relatively rapid increase of the mean arm ratio but a relatively slow rise of the ratio of
the longest chromosome to the shortest one and it is composed of Cryptomeria, Glyptostrobus,
Taxodium and Taiwania, which advance from primitive to progressive in the order. The latter
is characterized by, on the contrary, a relatively slow increase of mean arm ratio and a relative-
ly rapid rise of the ratio of chromosome size and it comprises Metasequoia, Sequoiadendron,
Sequoia and Cunninghamia (probably Athrotaxis also), which advance in the order. The infer-
ence is supported by the data from morphology, anatomy, embryology and so on.
Key words Taxodiaceae; Karyotype; Evolutionary line