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ISHS Acta Horticulturae 515: XXV International Horticultural Congress, Part 5: Culture Techniques with Special Emphasis on Environmental Implications Chemical, Physical and Biological Means of Regulating Crop Growth in Ornamentals and Other Crops

THE EFFECTS OF TEMPERATURE TREATMENTS ON STEM LENGTH OF EUSTOMA GRANDIFLORUM

Authors:   A. Takezaki, M. Fujino, M. Nonaka, H. Kawashima, A. Mori
Keywords:   Eustoma grandiflorum, number of nodes, stem elongation rate, stem length
Abstract:
We investigated the effect of high temperature conditions on the growth and the anthesis in Eustoma grandiflorum using cultivars ‘Tsukushi-no-yuki’, ‘Tsukushi-no-nami’, ‘Tsukushi-no-haru’ and ‘Asuka-no-sazanami’ for experiment 1 and ‘Azuma-no-nami’ for experiment 2. In experiment 1, SER (stem elongation rate) of plants grown with a condition of 28/23°C (day/night temperature) was greater than that with 22/17°C for all cultivars. The number of nodes decreased at high temperature conditions. Tsukushi-no-haru had highest SER and the greatest stem length among the four cultivars used when plants were grown with 28/23°C temperature. Selecting cultivars with high SER or those with many nodes at high temperature conditions is quite important for producing long stems. In experiment 2, three temperature treatments were examined: Treatment A kept 30/25°C throughout the experiments, treatment B was 30/25°C during the vegetative growth stage and 20/15°C during the reproductive stage and treatment C was 20/15°C during the experiment. Stem length in treatment A was shorter than that in treatment°C. The number of nodes decreased and averaged internodes length increased when plants were grown at high temperature conditions. Stem length and Internodes between upper nodes in treatment B was shorter than those in treatment A. Leaf unfolding rate increased when plants were grown at high temperature conditions. Days to anthesis in treatment A was the shortest among the three treatments. Early anthesis at high temperature conditions may attribute to the increase in leaf unfolding rate and the decrease in the number of nodes. Shorter stem length at high temperature conditions was due to the small number of nodes. Low temperature treatments during the reproductive growth stage had no effect on producing long stems.
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