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本文就苗期甜菜根和下胚轴部分进行了比较深入的形态解剖学的研究。甜菜的根端符合一般双子叶植物根端的典型结构。原分生组织分为三层原始细胞,皮层有单独的起源。甜菜初生维管组织的发育和子叶的发育是一致的;次生维管组织的发育起始于真叶的发育。最初的额外形成层早期就由中柱鞘和韧皮部薄壁细胞所衍生的厚层基本组织上产生,额外形成层直接分化出最初的三生维管组织。第二个额外形成层仍然由这些基本组织并且包括一部分栓内层细胞上产生。其后各额外形成层均由相应的三生基本组织和栓内层细胞上产生。愈到后期额外形成层由栓内层细胞产生的可能性愈大,并且有时前一个额外形成层的姊妹细胞变成另外一层的额外形成层细胞。文内着重讨论了甜菜三生结构的组织起源和子叶下轴与根颈的关系问题。在甜菜块根形态解剖方面,曾有过不少的研究[9·10·11·12],而一般国内外教科书[2·3·4·5·7]和一些成书中[1·6·8]已多有记载,但其结果并不一致。特别是对于甜菜三生结构的组织起源问题,至今仍是一个众说纷繁,有待统一的问题。就我国情况看来,目前甜菜已成为我国重要的糖料作物之一,对甜菜进行全面深入的形态解剖学研究,无疑是重要的。针对上述情况,我们在过去几年的工作中较为全面深入地做了苗期甜菜根和下?
In this paper, the seedling stage beetroot and hypocotyl part of a more in-depth morphological anatomy. The root end of the sugar beet conforms to the typical structure of the root end of an ordinary dicot plant. The original meristem is divided into three layers of primitive cells, the cortex has a separate origin. The development of primary vascular tissue and development of cotyledons in beet are consistent; the development of secondary vascular tissue begins with the development of true leaves. The initial extra cambium was previously produced on a thick basal tissue derived from pericycle and phloem parenchyma cells, with additional cambium differentiating directly into the original trigeminal vascular tissue. The second extra cambium is still produced by these basic tissues and includes a portion of the inner cell lining the cells. Subsequent additional layers were formed from the corresponding stromal cells and the inner lining cells. The more likely it is that the additional cambium will be produced by the inner cell of the suppository in the later stages and sometimes the additional extra cambium may become an additional cambium. The article mainly discusses the tissue origin of beet trios and the relationship between the cotyledons’ inferior axis and the root neck. In the anatomy of beet root morphology, there have been many studies [9 · 10 · 11 · 12], while the general domestic and international textbooks [2.3.4.5.7] and some books [1.6.8 ] There are many records, but the results are not consistent. Especially for the origin of the organization of sugar beet tri-tissue structure, it is still a problem that many people say numerous and yet to be uniformed. For our country’s situation, beet has now become one of the most important sugar crops in China. It is undoubtedly important to study the morphology and anatomy of beet comprehensively and thoroughly. In response to the above situation, we have done more comprehensive and in-depth work during the past few years, seedling beetroot and under?