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KMID : 0903619990400010122
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Journal of the Korean Society for Horticultural Science
1999 Volume.40 No. 1 p.122 ~ p.128
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Anatomical Characteristics of Rhizome , Root , and Pseudobulb of Korean Native Cymbidium goeringii Observed by Scanning Electron Microscope
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Abstract
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Scanning electron microscopic observations were carried out to identify anatomical characteristics of rhizome, root, and pseudobulb of Korean native Cymbidium goeringii. Rhizome tissue consisted of one layer of epidermal cells and dozens layers of cortex cells. Rhizome hairs were collectively emerged from protuberance on the surface of rhizome, and spherical starch grains were stored in cytoplasm of cortex. Lateral rhizome arose at periphery of vascular cylinder. Root tissue consisted of root hair, one-layer epidermis, 4-layer velamen, exodermis, dozens layer of cortex, endodermis, and root stele (central cyrinder). Starch grains were accumulated in cytoplasms of cortex cells. Vascular bundle, phloem and xylem differentiated in the central cylinder which was surrounded by pericycle. On the other hand, diameter of root and central cylinder were 4.0 and 0.5 ㎜ respectively, and width of cortex and velamen were 2.0 ㎜ and 1.5 ㎜, respectively. Basal plate, so called pseudobulb, was divided into two parts, lower ⅓ and upper ⅔ of the bulb. Leaves were emerged from the node of upper part, while coleoptile-like structure and axillary bud emerged from the nodes of lower part. Vascular bundles, phloem, and xylem like netshape were irregularly distributed in the ground tissues of pseudobulb. Apical meristem was dome-shaped with leaf primordia on its both side.
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