单瘤酸模根—茎转换区初生维管组织的解剖学研究

作者在对单瘤酸模（Ｒｕｍｅｘ ｃｒｉｓｐｕｓ ｖａｒ．ｕｎｉｃａｌｌｏｓｕｓ）幼苗维管组织做连续切片的解剖观察时看到，该植物维管组织从根到茎的变化过程中出现４个不同的中柱类型即（１）根－下胚轴的三元型星状中柱；（２）子叶节区下部的单体型原生中柱；（３）子叶节区上部的管状中柱和（４）上胚轴－苗端的真中柱。作者对此进行了讨论，认为子叶节区既然具有原始的单一管状类型的中柱，说明这一部位应为与古老 性顺官

ANATOMICAL STUDY ON THE TRANSITION OF PRIMARY VASCULAR TISSUE BETWEEN ROOT AND STEM OF RUMEX CRISPUS VAR. UNICALLOSUS

In this anatomical study on vascular tissue of Rumex crispus var. unicallo sus, authors found four types of vascular cylinder, from the root apex to the shoot apex, existing in the seedling of this plant: i. e. the type of actinostele which is triarch in the root; the type of haplostele in the lower part of cotyledon node zone; the type of siphonostele in the upper part of cotyledon node zone and the type of eustele in epicotyl - shoot zone. This result seems to support the CNZ theory proposed in 1990,because the haplostele, which is considered the most primitive type of vasular cylinder,exists in cotyledon node zone and there is a discussion about it here of . But the existence of siphonostele indicates a difference between CNZ theory and the conclusion done in this paper, and therefore the authors think it should be a problem deserving of some further study