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KMID : 0381920080380020117
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Korean Journal of Microscopy
2008 Volume.38 No. 2 p.117 ~ p.124
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Development of the Trichomes in Floating Leaves of Salvinia Species
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Seo Ae-Ri
Kim In-Sun
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Abstract
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Salvinia is an aquatic plant forming dimorphic leaves that have been modified into floating and submerged leaves. A pair of floating leaves plays an important role for the floating and photosynthesis while the submerged leaves, which are slim and long, have the form and function of root. Many aquatic plants develop trichomes in the epidermis but in Salvinia, trichomes grow densely in the epidermis of the dimorphic leaves. The present study examined the differentiation pattern of trichomes developing in the floating leaves of S. natans and S. molesta by scanning and transmission electron microscopy.
Trichomes developing in the floating leaves of Salvinia showed very different patterns. In S. natans, they were arranged
in a V-shape form, having 20~25 rows at 18~25?on both sides of the lamina divided by the midrib in the floating leaf. In each row, 8~10 oval-shaped cells, 200~290 μm in length, were arranged in a spiral fashion. Four trichomes of this form made a trichome unit, but their apical parts were separated from one another and developed into the so-called ‘knuckle-
crane’ type. On the other hand, in S. molesta, trichomes differentiated in a unique pattern quite different from those of S. natans. At the early stage of differentiation, trichomes protruded from the epidermis and then 4~6 cylindrical cells grew 400~600 μm long and the four trichomes formed as an unit. The four grouped trichomes were interconnected through their apex and developed in the ‘egg-beater’ type. Then 300~600 μm long multi-cellular stalk cells grew and protruded out of the epidermal surface from the basal part of the trichomes. Such a structural characteristic of trichomes is considered
to play a very important role along with the aerenchyma tissue in the leaf mesophyll tissue for the floating of Salvinia on the water surface.
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KEYWORD
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Aquatic plant, Salvinia species, Electron microscopy, Trichomes, Structural development
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