Abstract
Hybrid Tea-rose seedlings were grown, from germination to first flowering, at 6 constant temperatures between 10 and 26°C in greenhouses of our phytotron. All seedlings flowered regardless of temperature. When temperature increased, the juvenile period, the number of days to first flowering, the length of the leaved part of the shoot, the length of the flower stalk, the fresh weight of the shoot and of the root decreased; leaf number was not affected.
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