Effects of Gibberellins on Seed Germination of Phytochrome-Deficient Mutants of Arabidopsis thaliana : GROWTH AND DEVELOPMENT
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概要
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Experiments were carried out to explore the involvement of gibberellins (GAs) in the light-induced germination of Arabidopsis thaliana (L.) Heynh, using wild type (WT) and phyiochrome-deficient mutants (phyA, phyB and phyAphyB deficient in phytochrome A, B and A plus B, respectively). Seed germination of WT and phyiochrome-deficient mutants was inhibited by uniconazole (an inhibitor of an early step in biosynthesis of GA, the oxidation of ent-kaurene) and prohexadione (an inhibitor of late steps, namely, 2β-and 3β-hydroxylation). This inhibition was overcome by simultaneous application of 10-5 M GA_4. The relative activity of GAS for promoting germination of uniconazole-treated seeds was GA_4 > GA_1 = GA 9> GA_<20>. The wild type and the phyA and phyB mutants had an increased response to a red light pulse in the presence of GA_1, GA_4, GA_9, GA_<20> and GA_<24> but there were no significant differences in activity of each GA between the mutants. Therefore, neither phytochrome A nor hytochrome B appears to regulate GA biosynthesis from GA_<12> to GA_4 during seed germination, since the conversion of GA_<12> to GA_9 is regulated by one enzyme (GA 20-oxidase). However, GA responsiveness appears to be regulated by phytochromes other than phyiochromes A and B, since the phyAphyB double mutant retains the photoreversible increased response to GAS after a red light pulse.
- 日本植物生理学会の論文
著者
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Kamiya Y
Riken Plant Science Center
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Kamiya Yuji
Plant Science Center Riken
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KAMIYA Yuji
Laboratory for Cellular Growth and Development, Plant Science Center, RIKEN
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Kang Bong-joong
Laboratory For Plant Hormone Function Frontier Research Program The Institute Of Physical And Chemic
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Nagatani Akira
Laboratory Of Plant Physiology Department Of Botany Kyoto University
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Nagatani Akira
Laboratory For Photoperception And Signal Transduction Frontier Research Program The Institute Of Ph
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KENDRICK Richard
Laboratory for Signal Transduction and Photoperception, Frontier Research Program, The Institute of
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KAMIYA Yuji
RIKEN Plant Science Center
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Kamiya Y
Riken Kanagawa Jpn
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Kamiya Yuji
Riken Frp.
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YANG Young-Yell
Plant Science Center, RIKEN
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Yang Young-Yell
Laboratory for Plant Hormone Function, Frontier Research Program, The Institute of Physical and Chem
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Zhao Yu-Ju
Laboratory for Plant Hormone Function, Frontier Research Program, The Institute of Physical and Chem
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Kamiya Y
Growth Regulation Research Group Riken Plant Science Center
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Zhao Yu-ju
Laboratory For Plant Hormone Function Frontier Research Program The Institute Of Physical And Chemic
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Yang Young-yell
Plant Science Center Riken
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Kamiya Yuji
Frontier Research Program The Institute Of Physical And Chemical Research
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Kamiya Yuji
Growth Regulation Research Group Riken Plant Science Center (psc)
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KENDRICK Richard
Laboratory for Signal Transduction and Photoperception, Frontier Research Program, The Institute of Physical and Chemical Research (Riken)
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