Studies on “Bluing Effect” in the Petals of Red Rose

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  • Studies on “Bluing Effect” in the Petals of Red Rose
  • II. Observation on the development of the tannin body in the upper epidermal cells of bluing petals

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1. The tannin body begins to appear as a radiated structure in the early stage of development. Such a structure of the tannin body seems to be resulted from that the origin occurs at the region where the several cytoplasmic strands running across the central vacuole fuse each other to form a radiated shape.<br>2. Each thread of the radiated structure grows thicker, and the radiated shape of tannin body becomes somewhat star-like.<br>3. The star-like structure develops into a spherical body in the middle stage of the development. Following three layers are distinguished in the typical body: a) a central layer which seems to be composed principally of tannic substance, b) a layer enveloping the central layer, perhaps having special property of cytoplasm, c) a membrane-like layer accumulating tannic substance and covering the body.<br>4. The spherical tannin body becomes a massive appearance at the latter stage of development.<br>5. A part of the tannin body is in contact with parietal cytoplasmic layer.<br>6. It is suggested that the tannin body in the rose petals superficially resembles the tannin vacuole in the motor cell of Mimosa pulvinus.

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