ISHS Acta Horticulturae 454: III International Symposium on New Floricultural Crops
INFLUENCE OF HIGH TEMPERATURE ON FLOWER STEM LENGTH AND PHOTOSYNTHESIS OF ROSES |
| Authors: | H. Yamaguchi, Y. Hirata |
| Keywords: | shoot growth, internode length, Rosa hybrida |
| Abstract:
The influence of high temperature on flower stem length and photosynthesis of three rose cultivars (‘Carl Red’, ‘Samantha’ and ‘Carinella’) was investigated. The flower stem length of greenhouse roses was shorter in August than in May. In a controlled environment, the flower stem length was shorter at 30°C than at 20°C. The leaf number was almost the same regardless of season and temperature. Consequently internode length was affected by high temperature, resulting in short stem length. As for photosynthetic rates, there was no difference between the cultivars at 20°C and those at 30°C. These results indicated that the flower stem length of roses in summer was not related to photosynthetic rate. | |
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