CAJ | 학술논문

关于根茎初生维管系统之间的连接以及与子叶的关系,在文献中已有广泛的论述,有过各种不同的解释.大部分早期关于根茎转变区的文献研究的是初生组织已完成发育的幼苗.这些研究者认为转变区域是根和茎这两种轴器官之间维管组织发生转变、相互连接的区域.但由于茎中的初生维管组织可以认为是叶迹及叶迹的延伸的综合,转变区域应被看作是轴维管系统与叶迹维管系统之间的连接.因此,转变区的研究必须说明根维管系统与最早的真叶叶迹之间的关系.通过对北乌头和大豆胚胎及幼苗维管组织的解剖学研究,本工作显示在出土萌发的双子叶植物中,初生维管组织在根-下胚轴-子叶中形成一连续系统,并完成根与子叶叶迹之间的维管组织过渡转变.而上胚轴中的维管组织是位于根-下胚轴-子叶上方独立形成的第二维管系统.上胚轴中维管组织的分化起始于第一真叶叶迹基部,向上分化进入叶片,向下进入胚轴并在子叶节下方与根-下胚轴-子叶维管系统相连接.真叶叶迹的木质部与下胚轴中靠近韧皮部的后生木质部或次生木质部连接.根与上胚轴之间不存在维管组织的过渡、转变,而只是在同样发育方向的组织中有一种直接的简单的连接.
관우근경초생유관계통지간적련접이급여자협적관계,재문헌중이유엄범적논술,유과각충불동적해석.대부분조기관우근경전변구적문헌연구적시초생조직이완성발육적유묘.저사연구자인위전변구역시근화경저량충축기관지간유관조직발생전변、상호련접적구역.단유우경중적초생유관조직가이인위시협적급협적적연신적종합,전변구역응피간작시축유관계통여협적유관계통지간적련접.인차,전변구적연구필수설명근유관계통여최조적진협협적지간적관계.통과대북오두화대두배태급유묘유관조직적해부학연구,본공작현시재출토맹발적쌍자협식물중,초생유관조직재근-하배축-자협중형성일련속계통,병완성근여자협협적지간적유관조직과도전변.이상배축중적유관조직시위우근-하배축-자협상방독립형성적제이유관계통.상배축중유관조직적분화기시우제일진협협적기부,향상분화진입협편,향하진입배축병재자협절하방여근-하배축-자협유관계통상련접.진협협적적목질부여하배축중고근인피부적후생목질부혹차생목질부련접.근여상배축지간불존재유관조직적과도、전변,이지시재동양발육방향적조직중유일충직접적간단적련접.
Seeds and developing seedlings of Aconitum kusnezoffii were anatomized to examine vascular development in the root-hypocotyl transition region. The seedlings of Glycine max used to study the connection of the xylem from root to shoot. The germination of the both plants is epigeal. The change in orientation of vascular development is accomplished abruptly below the cotyledonary node. The primary vasculature of the root-hypocotyl-cotyledon is in continuation whereas the epicotyl vasculature is connected through the later formed vascular elements. The study supports Esau's (1965) view that the epicotyl is superimposed over the root-hypocotyl-cotyledon unit forming two independent units. There is no transition between root and epicotyl of dicotyledonous seedlings with epigeal germination, whereas only having a directly simple connection between the tissues with the same radially developmental direction.