Vascular differentiation in the pear root

Vascular differentiation in the pear root
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梨根部维管束分化

DOI：
10.3733/hilg.v15n03p299
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发表时间：
1943
期刊：
--
影响因子：
--
通讯作者：
K. Esau
K. Esau
中科院分区：
--
文献类型：
--
作者：
K. Esau

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摘要没有出现。第一页如下。 介绍 本文研究了梨根的发育过程，特别注意血管组织。虽然大量的信息 关于草本植物根结构的研究（海沃德，1938）;（Esau，1940），3只有一个关于木本植物根组织分化的相当完整的解释 似乎存在于现代植物学文献中（海沃德和Long，1942）。在植物解剖学教学中，特别是农业解剖学教学中， 机构，这是显而易见的。 选择这个问题也是因为作者对区分的兴趣 韧皮部组织在种子植物不同器官中的分布。由于许多研究已经 虽然在草本植物根的韧皮部上所作的研究（Esau，1943年的综述），但似乎及时地增加了一些关于木本根中这种组织的个体发育的数据。 材料和方法 用于制备永久性载玻片和显微照片的根材料 由植物营养部门从培养溶液中生长的树木中获得 在伯克利。将材料在福尔马林-乙酸-乙醇固定液中灭活， 在常规脱水和在乙基 酒精和二甲苯。 将培养液中生长的根与土壤中生长的幼根进行比较 5到6英寸高的树，由冬季Nelis品种的种子生长而成。后者 在徒手切片中检查根部。
Abstract does not appear. First page follows. Introduction The present paper deals with the development of the root of Pyrus communis L., with special attention to the vascular tissues. Though considerable information is available on root structure of herbaceous plants (Hayward, 1938); (Esau, 1940),3 only one rather complete account of tissue differentiation in a root of a woody species appears to exist in modern botanical literature (Hayward and Long, 1942). The need for such accounts in the teaching of plant anatomy, especially in agricultural institutions, is obvious. The present problem was selected also because of the writer’s interest in the differentiation of the phloem tissue in different organs of seed plants. Since many studies have been made on the phloem of roots of herbaceous plants (review by Esau, 1943), it seemed timely to add some data on the ontogeny of this tissue in a woody root. Materials and Methods The root material used in preparing the permanent slides and the photomicrographs was obtained from trees grown in a culture solution by the Plant Nutrition division at Berkeley. The material was killed in a formalin-acetic-alcohol fixing fluid and imbedded in paraffin after ordinary dehydration and clearing in mixtures of ethyl alcohol and xylene. The roots grown in the culture solution were compared with soil grown roots from young trees 5 to 6 inches high grown from seeds of the Winter Nelis variety. The latter roots were examined in free-hand sections.