Comparative studies on the development of embryo and primary root in Commelinales

鸭跖草目胚与初生根发育的比较研究

基本信息

批准号：
61480014
负责人：
YAMASHITA Takashi
金额：
$ 4.03万
依托单位：
Ochanomizu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-61480014/
关键词：
Commelinaceae Gramineae Coix Embryogenesis Primaryt root Root cap Coleorrhiza コンピューターグラフィックス

项目摘要

In the majority of angiosperms, the primary root has an exogenous origin. Its development does not effect any tissue disintegration, because the root cap in formed by periclinal divisions of the primary dermatogen, the outermost cell-layer of the embryo. An exceptional case is the first embryonal root of Gramineae. It dissolves the surrounding tissue and makes a cavity which separates the root cap and the outermost envelop, the coleorrhiza. In the embryo of Coix, four root primordia develop successively within a common cavity and a common coleorrhiza. All of them are endogenous and no strctural difference was observed among them.During the embryogenesis of Commlina, the root cap of the primary root is initiated exogenously from the dermatogen. However, it grows later in a peculiar way. Shortly after germination, some cells within the lateral region of the root cap begin to dissolve by autolysis, forming a cavity. By the enlarging cavity the root cap is separated into an inner and an outer part. The inner part adheres to the root body, but the outer part is pierced by the growing root body, finally spreads off and forms an umbraculiform appendage at the hypocotyl base. It seems possible to consider this mode of development to be intermediate between exogenous and endogenous root formation.Embryos of Habenaria and Platanthera (Orchidaceae) were cultivated in sterilized nutritious medium. Protocorms, adventitious roots and tuberous roots were investigated morphologically and anatomically. Shoot apex of the main axis is enclosed by proximal part of the tuberous root primordium. Then the tuberous root grows, together with the shoot apex, out of the plant body through a broken hole of the stem.The author endeavored to draw anatomical figures of these reports by computer graphics. But the sortware programming is not yet completed. He has a plan to make additional reports in the following years.

在大多数被子植物中，主要根部具有外源性。它的发育不会影响任何组织瓦解，因为由原代皮肤原成骨的根帽是胚胎的最外层细胞层形成的。一个特殊的情况是gramineae的第一个胚胎根。它溶解周围的组织，并制成一个腔，将根帽和最外部包膜分开。在Coix的胚胎中，四个根源在一个共同的腔体和一个共同的鞘翅目的中依次发展。所有这些都是内源性的，在它们之间未观察到曲折的差异。在commlina的胚胎发生下，主要根部的根帽是从皮肤病原外源开始的。但是，稍后它以特殊的方式生长。发芽后不久，根盖的侧向区域内的某些细胞开始通过自体溶解，形成腔。通过扩大的腔体，根帽分为内部和外部。内部粘附在根体上，但外部被生长的根体刺穿，最终散开并在下胚轴底部形成遮阳罩附属物。似乎可以考虑这种发展方式介于外源性和内源根形成之间。在灭菌营养培养基中培养了Habenaria和Platanthera（Orchidaceae）的embryos。在形态和解剖学上研究了原始的，不定根和块茎根。主轴的芽顶被结节根原始的近端部分包围。然后，块茎根与芽的先端一起从植物体中通过茎的破裂孔生长，作者努力通过计算机图形来绘制这些报告的解剖图。但是，尚未完成排序器件编程。他有一个计划在接下来的几年中提出其他报告。