Temperature affects growth and flowering of the balloon flower [Platycodon grandiflorus (Jacq.) A. DC. cv. Astra Blue]
1998
Park, B.H. | Oliveira, N. | Pearson, S.
The effects of temperature from 14 to 29 degrees C on the growth and flowering of Platycodon grandiflorus (Jacq.) A. DC. cv. Astra Blue are described. Under greenhouse conditions, seedlings flowered earliest (after 45 days) when grown at 29 degrees C, vs. after 108 days when grown at 14 degrees C. Height at flowering was greatest at 19 degrees C and branch number was greatest (13 per plant) at 22 degrees C. Fresh and dry mass and leaf area at flowering increased with decreasing temperature. Imbibing seeds at 4 degrees C prior to germination had no significant affect on the time to flowering or the number of nodes below the flower. In a growth chamber experiment, apical dissections showed that flowers were initiated earlier at 20 degrees C than at 10 degrees C. These results show that the balloon flower is highly sensitive to temperature, but cool temperatures delay the time to flower initiation or flowering.
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