研究报告

掌叶大黄根茎大黄多糖的贮藏和分布特征

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  • 宁夏大学生命科学学院, 银川 750021

收稿日期: 2009-04-29

  修回日期: 2009-11-02

  网络出版日期: 2010-05-01

Storage Localization Characteristics of Rhubarb Polysaccharide in Rhizome of Rheum palmatum

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  • College of Life Science, Ningxia University, Yinchuan 750021, China

Received date: 2009-04-29

  Revised date: 2009-11-02

  Online published: 2010-05-01

摘要

采用组织化学方法和苯酚硫酸比色法研究了大黄多糖在掌叶大黄(Rheum palmatum)根茎中的贮藏分布特征及其含量变化规律。结果表明: 大黄多糖在根茎中呈多位点贮藏, 在根茎的周皮、皮层、次生维管组织的薄壁细胞以及髓内不同程度地贮藏和积累了一定数量的大黄多糖, 次生木质部的木薄壁细胞以及次生韧皮部的韧皮薄壁细胞是大黄多糖的主要贮藏和积累部位; 不同发育时期根茎中大黄多糖含量的变化规律为: 随着植物的生长, 根茎及其各组织中大黄多糖的总含量表现为逐渐增高的趋势, 但在发育的后期略有下降; 与木薄壁细胞相比, 韧皮薄壁细胞贮藏大黄多糖量相对较多, 大黄多糖的贮藏和积累方式为逐渐累积。次生维管组织为大黄多糖贮藏和积累的主要组织。

本文引用格式

章英才*;李瑞 . 掌叶大黄根茎大黄多糖的贮藏和分布特征[J]. 植物学报, 2010 , 45(03) : 372 -378 . DOI: 10.3969/j.issn.1674-3466.2010.03.009

Abstract

The distribution characteristics and content change laws of rhubarb polysaccharide in the rhizome of Rheum palmatum were studied by histochemical methods and phenol-vitriol colorimetry. The results were described as follows: The distribution of rhubarb polysaccharide in the rhizome had a multilocus character. Rhubarb polysaccharide shows different distribution in the periderm, cortex and parenchymas of secondary vascular tissue and pith. The xylem parenchymas of the secondary xylem and the phloem parenchymas of the secondary phloem are the chief tissues that accumulate and store rhubarb polysaccharide. During different growth periods of rhizome, the total content of rhubarb polysaccharide in the rhizome and its tissues increased gradually with growth of the plant but decreased slightly in a later period. Rhubarb polysaccharide content is greater in phloem parenchyma than in xylem parenchyma. The mode of rhubarb polysaccharide production is gradual accumulation and storage. The secondary vascular tissues are the chief tissues that accumulate and store rhubarb polysaccharide in rhizome.
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