Changes in cytokinin levels of Phalaenopsis leaves at high temperature |
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| Affiliation: | 1. Department of Biological Sciences, National Sun Yat-Sen University, Kaohsiung City, Taiwan, ROC;2. National Chia-yi Institute of Technology, Chia-Yi City, Taiwan, ROC;3. Research Institute of Chemistry, National Sun Yat-Sen University, Kaohsiung City, Taiwan, ROC;4. Research Institute of Life Sciences, National Kaohsiung Normal University, Kaohsiung City, Taiwan, ROC;1. Department of Bioscience and Food Production Science, Interdisciplinary Graduate School of Science and Technology, Shinshu University, 8304, Minami-minowa, Nagano, 399-4598, Japan;2. Faculty of Science, Srinakharinwirot University, 114, Sukhumvit 23, Bangkok, 10110, Thailand;3. Department of Bioscience and Biotechnology, Faculty of Agriculture, Shinshu University, 8304, Minami-minowa, Nagano, 399-4598, Japan;4. Division of Science, Faculty of Liberal Arts and Science, Nakhon Phanom University, 167 Naratchakouy Sub-District, Muang District, Nakhon Phanom, 48000, Thailand;5. Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan;6. Division of Terrestrial Ecosystem, Institute of Mountain Science, Shinshu University, 8304, Minami-minowa, Nagano, 399-4598, Japan;1. AgroBioSciences, University Mohammed VI Polytechnic (UM6P), Lot-660 Hay Moulay Rachid, 43150 Ben Guerir, Morocco;2. University Mohammed VI Polytechnic (UM6P), Lot-660 Hay Moulay Rachid, 43150 Ben Guerir, Morocco;3. Department of Biophysics and Radiobiology, Faculty of Biology, St. Kliment Ohridski University of Sofia, Sofia, Bulgaria;4. Bioenergetics and Microbiology laboratory, University of Geneva, CH-1254 Jussy-Geneva, Switzerland;5. North West University South Africa, Potchefstroom, North-West Province, South Africa;1. Department of Biochemistry and Biotechnology, Poznań University of Life Sciences, Dojazd 11, 60-632 Poznań, Poland;2. Department of Plant Physiology, Poznań University of Life Sciences, Wołyńska 35, 60-637 Poznań, Poland;1. Dipartimento SBAI, Sapienza Università di Roma, Rome, Italy;2. I.N.F.N. - Sezione Roma1, Gr. IV - MMNLP (Mathematical Methods in NonLinear Physics), Rome, Italy;3. Mid Sweden University, S-851 70 Sundsvall, Sweden;4. Instytut Matematyki, Uniwersytet Jana Kochanowskiego w Kielcach, Poland |
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| Abstract: | ![]()
The effect of high temperatures on cytokinin levels in Phalaenopsis hybrida leaves was investigated. Endogenous cytokinins were identified and quantified in Phalaenopsis leaves grown under high temperature conditions (30/25 °C day/night) using high performance liquid chromatography, bioassay and gas chromatography-selected ion monitoring-mass spectrometry. After 5 and 20 d of low temperature (25/20 °C day/night), zeatin, zeatin riboside and dihydrozeatin levels in the leaves were higher than that in leaves subjected to high temperature treatments. When Phalaenopsis leaves were exposed to low temperatures, about 76 % of the free cytokinins detected were of the zeatin-type. Glucoside cytokinins in the leaves increased significantly 5 d following high temperatures, and the rate of increase in glucoside cytokinins corresponded to the duration of high temperatures. At the same time, zeatin riboside and dihydrozeatin declined significantly following high temperature application. A significant accumulation of glucoside cytokinins, zeatin-9-glucoside, zeatin-O-glucoside, zeatin riboside-O-glucoside, and dihydrozeatin-O-glucoside was observed 20 d following high temperatures. These results suggest that high temperatures lead to an accumulation of glucoside cytokinins and a reduction of free base and riboside cytokinins. |
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