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The origin of a Mesozoic plant Bennettitales, and extinction

中生代植物 Bennettitales 的起源和灭绝

基本信息

批准号：
13640474
负责人：
OHANA Tamiko
金额：
$ 1.73万
依托单位：
Institute of Natural History
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13640474/
关键词：
Bennetticarpus Hokkaido Mesozoic Ryoseki-type flora Yezo Group 領石型植物群

项目摘要

The bennettitales is classified into many genus according to the external form. In the Eastern Asia, bennettilates were grow in both the Tetori-type flora and the RyosekPtype flora. However, in these cuticle structures, the influence of the environments of the growth area has appeared. The bennettitales of the same species are not found from both floras. Therefore, the origin of a bennettitales is considered before establishing the both floras (before Early Jurassic).Modern plants is classified according to the structure of the reproductive organ. Although it is the same also in a fossil plant, though unfortunately, the fossil plant is fragmentary and it is rare that the parts of all plants find together. Therefore, there is Little information acquired and it must be 'judged from few of the information.Consequently, it is find out that bennettitalean reproductive organ is similar to that of some Palaeozoic primitive seed ferns. This has suggested a possibility that bennettitales and seed fern have a common ancestor. However, the thing with the feature of reproductive organ that bennettitales and a modern plant is not found yet.The early angiosperm appeared in the Early Cretaceous in the Eastern Eurasia. However the direct relation between bennettitales and angiosperm is not understood yet, it is expected that the plant which become the ancestor of angiosperm out of primitive bennettitales has been produced.

贝内蒂目根据外部形态分为许多属。在东亚，苯甲酸盐在 Tetori 型植物群和 RyosekP 型植物群中均生长。然而，在这些角质层结构中，出现了生长区域环境的影响。在这两个植物区系中均未发现同一物种的贝内蒂目。因此，在建立这两个植物区系之前（早侏罗世之前）就必须考虑贝尼蒂目的起源。现代植物是根据生殖器官的结构进行分类的。虽然在植物化石中也是如此，但不幸的是，植物化石都是零散的，所有植物的各个部分都找到在一起的情况很少见。因此，所获得的信息很少，只能从少量信息来判断。由此，我们发现本内蒂塔利植物的生殖器官与一些古生代原始种子蕨类植物的生殖器官相似。这表明本尼蒂目和种子蕨可能有共同的祖先。但目前还没有发现像贝内蒂目和现代植物那样具有生殖器官特征的东西。早期被子植物出现在欧亚大陆东部早白垩世。然而，贝内蒂目和被子植物之间的直接关系尚不清楚，预计从原始贝内蒂目中已经产生了成为被子植物祖先的植物。