Biochemical Systematics of Gymnosperms (3)—On the Systematic Position of Tax aceae from Their Seed Protein Peptides and Needle Peroxidases

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Biochemical Systematics of Gymnosperms (3)—On the Systematic Position of Tax aceae from Their Seed Protein Peptides and Needle Peroxidases

Hu Zhi-Ang, Wang Hong-Xin, Liu Chang-Jiang, Qian Zhong-Xing

(Institute of Botany, Academia Sinica, Beijing)

Received:1900-01-01 Revised:1900-01-01 Online:1986-08-18 Published:1986-08-18
Contact: Hu Zhi-Ang

Abstract

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.

Key words: Taxaceae, Seed protein peptides, needle peroxidases, Systematic position

Hu Zhi-Ang, Wang Hong-Xin, Liu Chang-Jiang, Qian Zhong-Xing. Biochemical Systematics of Gymnosperms (3)—On the Systematic Position of Tax aceae from Their Seed Protein Peptides and Needle Peroxidases[J]. .

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Biochemical Systematics of Gymnosperms (3)—On the Systematic Position of Tax aceae from Their Seed Protein Peptides and Needle Peroxidases

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