Temporal lag between gene expression and metabolite accumulation in flavonol biosynthesis of Arabidopsis roots |
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| Institution: | 1. RIKEN Center for Sustainable Resource Science, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan;2. Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8675, Japan;1. Key Laboratory of Tropical Medicinal Plant Chemistry of Ministry of Education, Hainan Normal University, Haikou 571158, PR China;2. Guangxi Key Laboratory of Traditional Chinese Medicine Quality Standards, Guangxi Institute of Traditional Medical and Pharmaceutical Sciences, Nanning 530022, PR China;3. College of Pharmacy, Fujian University of Traditional Chinese Medicine, Fuzhou 350122, PR China;1. National and Local Union Engineering Research Center of Veterinary Herbal Medicine Resources and Initiative, Hunan Agricultural University, Changsha, 410128, China;2. School of pharmacy, Hunan University of Chinese Medicine, Changsha 410208, China;3. Pharmaceutical Analytical & Solid-State Chemistry Research Center, Shanghai Institute of Materia Medica, Chinese Academy of Science, Shanghai 201203, China;1. College of Pharmacy, Jiangxi University of Traditional Chinese Medicine, Nanchang 330004, PR China;2. State Key Laboratory of Innovative Drug and Efficient Energy-Saving Pharmaceutical Equipment, Jiangxi University of Traditional Chinese Medicine, Nanchang 330006, PR China;1. Department of Resources Science of Traditional Chinese Medicines, China Pharmaceutical University, Nanjing 210009, China;2. Key Laboratory of Modern Traditional Chinese Medicines, China Pharmaceutical University, Nanjing 210009, China;1. School of Pharmacy, Anhui University of Chinese Medicine, Anhui Key Laboratory of Modern Chinese Materia Medica, Hefei 230012, China;2. Synergetic Innovation Center of Anhui Authentic Chinese Medicine Quality Improvement, Hefei 230012, China;3. Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;4. The First Affiliated Hospital, Anhui University of Chinese Medicine, Hefei 230038, China |
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| Abstract: | The temporal lag between gene expression and metabolite accumulation has been estimated in flavonol biosynthesis, but the time difference between these events is unclear. In the present study, we investigated the expression of flavonol biosynthetic genes ELONGATED HYPOCOTYL5, MYELOBLASTOSIS PROYEIN12/PRODUCTION OF FLAVONOL GLYCOSYDES1, CHALCONE SYNTHASE, CHALCONE ISOMERASE, FLAVANONE 3-HYDROXYLASE, and FLAVONOL SYNTHASE1, and the accumulation of flavonol glycosides (kaempferol and quercetin glycosides) in time-series samples of Arabidopsis thaliana roots. All genes started to be expressed within 3 h after sequential light irradiation (HAS) and reached their maximum expression levels at 12 HAS, and the accumulation of the flavonol glycosides started at 6 HAS. Metabolome analysis using liquid chromatography-mass spectrometry showed that the accumulation of kaempferol 3-O-glucoside-7-O-rhamnoside and kaempferol 3-O-rhamnosyl (1 → 2) glucoside-7-O-rhamnoside reached their maximum levels at 48 HAS, whereas other flavonol glycosides, such as kaempferol/quercetin 3-O-rhamnoside-7-O-rhamnoside, quercetin 3-O-glucoside-7-O-rhamnoside and quercetin 3-O-rhamnosyl (1 → 2) glucoside-7-O-rhamnoside, increased gradually until 96 HAS. These results show that the expression of the flavonol genes is an early response against light exposure, and that the accumulation of the flavonol glycosides is a late response. |
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| Keywords: | Metabolome analysis Temporal lag Gene expression Metabolite accumulation Flavonol |
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