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Biochemical Systematics of Gymnosperms (4)—Seed Protein Peptides and Needle Peroxidases of Taxodiaceae

Hu Zhi-Ang, Wang Hong-Xin, Liu Chang-Jiang   

  1.  (Institute of Botany, Academia Sinica, Beijing)
  • Received:1900-01-01 Revised:1900-01-01 Online:1986-12-18 Published:1986-12-18
  • Contact: Hu Zhi-Ang

Abstract:

An analysis of seed protein peptides by using SDS polyacrylamide gel electropho-
resis, indicates that all members in Taxodiaxeae share three peptides with molecular weights of
24, 32 and 10 kilodaltons. Generally, seeds of this family contain 2 to 4 major peptides, and
their molecular weights are distributed in two regions: 24-26 K and 29-36 K respectively. The
quantity of these major peptides is near or even more than 50% of seed total protein content.
This kind of protein profiles is similar to that of Taxaceae and Cephalotaxaceae rather than to
that of Pinaceae.  On the other hand, a considerable difference was observed in peptides with
higher molecular weights. Among different species within a genus, no difference has been found
both in their seed protein profiles and in their needle peroxidases.  Based on the data cited here,
it seems that the relationships among most genera of Taxodiaceae are not so closed as the rela-
tionship among following genera: Sequoia, Sequoiadendron and Taxodium.

Key words: Taxodiaceae, Seed Protein, Peroxidase

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