Epidermal Structure on Coloring in the Leaves of VELVET RAINBOW, a Cloleus

概要

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The leaf surface of a coleus, VELVET RAINBOW, has somewhat velvety dark red color like the petal of some black roses. The leaf structure of this cultivar is compared with that of RED RAINBOW, a cultivar not velvety dark red. The results observed here are as follows: (1) No essential difference in the leaf sections between two cultivars is recognized except for their surface structures. (2) In the surface structure the epidermal cells of the leaf of VELVET RAINBOW are of longer papillate form, their lateral walls are less slanting to the surface and the spaces among them are more narrow than in those of RED RAINBOW. (3) In the surface view of the leaf of VELVET RAINBOW the shadow is found on epidermal cell walls, when the surface is illuminated at angles of 25 and 20 degrees, at which the shadow is not visible in that of RED RAINBOW. These facts can lead the author to the conclusion that the blackish appearance on the leaf of Velvet Rainbow is mainly caused by the shadow of epidermal cells, and the surface structure of the leaf of this cultivar may be more suitable to form the shadow.
信州大学理学部の論文
1967-03-13