作 者 ：Hu Zhi-Ang, Wang Hong-Xin, Liu Chang-Jiang, Qian Zhong-Xing
期 刊 ：植物分类学报 1986年 4期
关键词：
Keywords:Taxaceae, Seed protein peptides, needle peroxidases, Systematic position,
Abstract:
The major peptides in the seed of Taxus and Pseudotaxus have molecular
weight about 31, 22 and 20 kilodaltons (Kd) shown by SDS polyacrylamide gel electrop-
horesis. The seed protein peptides of Cephalotaxus is very similar to those of Taxus
and Pseudotaxus except a few bands of high molecular weight. Some considerable dif-
ferences in peptide pattern exist between Amentotaxus and the three genera cited above.
The former has a new major peptide, 33K, but lacks 22 K. The seed of Torreya does
not contain peptide 44 K, although Torreya and Amentotaxus have many bands in com-
mon. To a certain extent, the seed protein peptides of Podocarpus nagi are similar to
those of the above taxa.
A great range of divergency in needle peroxidases among different genera of Ta-
xaceae has been observed by using electrophoresis, while the zymogram of Cephalotaxus
is somewhat similar to that of Taxus.
Two series of protein data demonstrate, that there is an evolutionary tendency from
Taxus to Torreya through Pseudotaxus and Amentotaxus within Taxaceae. And the
Taxaceae is closely related to Cephalotaxus by way of Taxus. The systematic position
of the Taxaceae, therefore, should be placed under the Coniferales.