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KMID : 0903619950360060851
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Journal of the Korean Society for Horticultural Science
1995 Volume.36 No. 6 p.851 ~ p.862
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Stomatal Density , Size and Morphological Characteristics in Orchids
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Abstract
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Thirty three kinds of orchids including different genus, species and cultivars were evaluated in terms of stomatal density, size and other morphological characteristics. The stomata are mainly confined to the abaxial side of the leaf except Bletilla striata which showed 516 stomata per ㎠ on the adaxial side of leaf. The number of stomata per unit leaf area tend to increase with plant age except for oncidium, whereas stomatal size tend to decrease with age. The sizes of stomata in the terrestrial species were small but stomatal density was high compared to epiphytic species. The number of stomata per unit leaf area were variable from 2711/㎠ in Paphiopedilum wellesleyanum to 26,988/㎠ in Cymbidium goeringii ´Yunpajihwa´. The stomatal cover in temperate cymbidiums are circular, raised above the surrounding epidermis, and epidermal cell surface were papillose. Pore shapes could be distinguished by circular, fusiform and slit-shaped types and epidermal surfaces were smooth and papillose depending on species. Characters of the epidermis and stomata would appear to be useful in the elucidation of relationships between genera.
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