作 者 ：Hu Zhi-Ang, Liu Zhang-Jiang, Wang Hong-Xin
期 刊 ：植物分类学报 1984年 5期
关键词：松科种子蛋白多肽分子进化；
Keywords:align=left Pinaceae, seed protein peptides, molecular evolution,
Abstract:
By means of SDS linear gradient polyacrylamide gel electrophoresis, seed
protein peptides of 50 species belonging to 10 genera of Pinaceae were analysed. A
major peptide possessing molecular weight about 45000 daltons is shared by every species
in Pinaceae. There are many peptides of higher molecular weight in seeds, but their
content is very low. In order to make a series of quantitative comparisons between any
two taxa, we define “peptide distance” as follows:
number of different peptides between 2 taxa
peptide distance= ------------
total number of peptides in 2 taxa
In the following table, the peptide distances of some genera are shown together with
other molecular data about Pinaceae.
|
genus |
ancientry of
genus |
antigen
distance |
zymogram
distance |
peptide
distance |
|
Larix |
Miocene to now (25My) |
0 |
0 |
0.08 |
|
Cedrux
Pseudotsuga
Keteleeria |
Oligocene to now (35My) |
_
_
_ |
0
0.17
0.29 |
_
_
_ |
|
Tsuga
Abies |
Eocene to now (57My) |
1.0
_ |
_
0.44 |
_
0.35 |
|
Picea |
Late Cretaceous-(67-100 My) |
0.5 |
0.30 |
0.18 |
|
Pinus |
Early Cretaceous-(100-130My) |
2.3 |
0.67 |
0.39 |
From the data cited above, there are positive correlation between molecular data
and the ancientry of genera in Pinaceae. Therefore, the rate of molecular evolution
seems stable. Based on the data of peptide distances, it is suggested that the variation be
discontinuous between the genera, but continuous within a genus. A comparison between
molecular and morphological evolution indicates that the two evolutions are different not only in rate but in mechanism as well.