摘要
应用植物解剖学、组织化学、荧光显微镜、透射电镜及植物化学技术,研究了芦荟属AloeL.植物茎、叶的结构与芦荟素类物质积累的关系。结果表明,叶维管束内的大型薄壁细胞为芦荟素的主要贮存结构。其来源于原形成层,属特化的韧皮部大型薄壁细胞。芦荟素在叶的同化组织细胞的质体中合成,通过质外体途径转运到维管束鞘细胞,由其胞间连丝运送到大型薄壁细胞内贮存。该属植物叶内维管束的密度、大型薄壁细胞的大小和同化组织的厚度与芦荟素含量呈正相关。同一植物中芦荟素的含量为幼叶>成熟叶>衰老叶,叶片顶部>中部>基部,并与其维管束的密度呈正相关。研究结果澄清了有关芦荟中含芦荟素结构的一些争议。
A multidisciplinary approach consisting of anatomy , histochemistry , fluorescent microscopy , transmission electron microscope and phytochemistry was used to investigate the structure and accumulation of aloin in the stems and leaves of Aloe L. Results show that the large parenchymatous cells of vascular bundles are the mainly storage site of aloin. These cells stemmed from the promeristem, are the special phloem parenchyma cells. Aloin was produced in the plastids of the assimilating tissue, it reached the vascular bundle sheath by apoplastic endoplasmic , stored, finally in the large parenchymatous cells by means of plasmodesmata. Some positive correlations existed between aloin content and some phytotomic factors including the density of vascular bundles, the ratio of the large parenchymatous cells and the thickness of the chlorenchyma. In the same species, the aloin cumulated maximally in the young leaf and the following was successively mature leaf and old leaf. In the same leaf, the aloin cumulated maximally in top and the following was successively middle and old base. Results of the study clarified some points of view on the aloin structure.
出处
《山地农业生物学报》
2005年第6期506-513,共8页
Journal of Mountain Agriculture and Biology
基金
国家自然科学基金资助项目(30470105)
