Effects of Temperature and Shade Treatment on Flower Colors and Characteristics in Newly Established Reddish－Purple Tuberose（Polianthes）

Effects of temperture and light condition on flower colors and flower colors and flowering characteristics of newly established reddish－purple flowered tuberose \u2777A05\u27 were investigated. Days to anthesis from planting of corms at 20℃ were significantly longer than at 25 or 30℃. Floret diameter and petal length was significantly larger at 30℃ than at 20 or 25℃. Flower color was almost white at 30℃, whereas the flowers cultivated at 20℃ showed reddish－purple. The flowers cultivated at 25℃ were almost white by 45% shading, but pale reddish－purple under 25 or 0% shade treatment. Anthocyanin content was extremely low at 30℃. These results seem to relate to the enzyme activity which participate the biosynthesis of anthocyanins. Environmental conditions for the cultivation of the anthocyanin－containing hybrid tuberose must be carefully considered