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Anatomy, Histochemistry and Phytochemistry of Leaves in Aloe vera var. chinensis

Acta Botanica Sinica 2001年第8期43卷 780-787页

作者：沈宗根 Elena CHAUSER-VOLFSON Yitzchak GUTTERMAN 胡正海西北大学植物研究所西安710069 Ben-Gurion University of the Negev Jacob Blaustein Institute for Desert Research and Department of Life Sciences

A multidisciplinary approach-anatomy, histochemistry and phytochemistry-was used to investigate the leaf structure, the content and the storage location of barbaloin in the leaves of Aloe vera L. var. chinensis (Haw.) Berg. Xeromorphic characteristics including secondary thickened epidermal cell walls, thicker cuticle, ambiguous differentiation of spongy and palisade tissues in the chlorenchyma, and well-developed aquiferous tissue could be seen in the leaves. Several large parenchymatous cells were observed at the phloem pole of the first ring of vascular bundles. The secondary ring of vascular bundles in the leaf base and the stomata, which are surrounded by five cells, have some classification significance in this species. The density of vascular bundles, the content of barbaloin and the intensity of histochemical reaction differed among leaf numbers Ll (annual leaf), L2 (biennial leaf), L3 (triennial leaf) and L4 (quadrennial leaf), and in different parts of the leaf. These three factors were highest in the youngest leaf, Ll, and top parts of all the leaves and lowest in the basal parts and the oldest leaf, L4. The density of vascular bundles had a positive correlation to the content of barbaloin. The histochemical results revealed that the small sheath cells that surrounded the bundles might be the location of barbaloin synthesis and the large parenchymatous cells beneath the sheath might be the storage places of this metabolite.

关键词： Aloe vera var. chinensis leaf structure barbaloin content density of vascular bundles histochemical reaction

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