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药用大黄（Rheum offiunate）干燥根与根茎是一种重要的中药材。我省各地区均有栽培。其根茎除了在髓部具有周木型的异常维管束外,在皮层还分布有周韧型的皮层维管束。本文主要描述了药用大黄根茎中皮层维管束的发生和发育规律。 材料和方法 实验材料于1988年分三次采自栽培在兰州医学院药圃的药用大黄栽培植株。分别用FAA固定,石蜡法制片,连续横切和纵切片,厚度10—13μm,用番红、亮绿双重染色。另外,还参做了徒手切片。 观察结果 1.皮层维管束的结构及其在根茎中的分布 药用大黄根茎的早期结构类似于一般的双子叶植物,由周皮、皮层和维管栓三部分组成,其中,维管栓中央有发达的髓。 在三年生的根茎横切面上,可见到皮层内分布有1—2圈环状排列的周韧型维管束。它们位于周皮内的皮层薄壁组织中,在皮层中与周皮之间若是单环排列通常相隔10—
Medicinal rhubarb (Rheum offiunate) dried root and rhizome is an important Chinese herbal medicine. All areas in our province are cultivated. In addition to its anomalous vascular bundles in the pith, the rhizomes are distributed in the cortex with cortical vascular bundles. This paper mainly describes the occurrence and development of cortical vascular bundles in rhizomes of medicinal rhubarb. Materials and Methods Experimental materials were collected three times in 1988 from medicinal rhubarb planted plants cultivated in the Lanzhou Medical College. The samples were fixed with FAA and paraffin wax. The slices were continuously transected and longitudinally sectioned. The thickness was 10-13 μm and stained with safranine and bright green. In addition, freehand slicing was also introduced. Observed results 1. Structure of cortical vascular bundles and their distribution in rhizomes The early structure of rhizomes of medicinal rhubarb is similar to that of common dicotyledonous plants. It consists of three parts: periderm, cortex and vascular thrombus. There is a developed marrow. In the three-year cross-section of the rhizomes, there are circumflex vascular bundles arranged in a circle of 1-2 rings in the cortex. They are located in the cortical parenchyma inside the perianal skin, usually separated by 10 if they are arranged in a single ring in the cortex.