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Journal of the Japanese Horticultural Society
(1964)  Page(s) 140-146.  
 
Shisa, M. & Takano, T. The effects of temperature and light on the colour of rose flowers. J. Jap. Hort. Soc. 33: 140-146. 1964.
The formation of red pigments in the hybrid tea variety Crimson Glory was studied in plants growing in a phytotron at temperatures ranging from 10 degrees to 30 degrees C. At 10 and 20 degrees the petals were dark red and resembled velvet, the upper epidermis being much thicker than that of petals treated at 30 degrees. At a day and/or night temperature of 30 degrees, the upper epidermis was flattened and the red colour did not appear. 
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