Effects of sterol biosynthesis-inhibiting fungicides and plant growth regulators on the sterol composition of barley plants |
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| Institution: | 1. Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China;2. Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, Hainan University, HaiKou 570228, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Hubei Key Laboratory of Wetland Evolution & Ecological Restoration, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China;1. Diabetes Center and Department of Anatomy, University of California, San Francisco, San Francisco, CA 94143, USA;1. Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, Institute of Tropical Agriculture and Forestry, Hainan University, HaiKou, 570228, China;2. Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China;3. College of Horticulture and Forestry, Huazhong Agricultural University, Wuhan, 430070, China;4. Hubei Key Laboratory of Wetland Evolution & Ecological Restoration, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China;5. University of Chinese Academy of Sciences, Beijing, 100049, China;1. Section of Specialized Endocrinology, Department of Endocrinology, Oslo University Hospital, Oslo, Norway;2. Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway;3. Research Institute for Internal Medicine, Oslo University Hospital, Oslo, Norway;4. Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway;5. Department of Neurosurgery, Oslo University Hospital, Oslo, Norway;1. Chulabhorn Research Institute, Kamphaeng Phet 6, Talat Bang Khen, Lak Si, Bangkok 10210, Thailand;2. Faculty of Pharmaceutical Sciences, Khon Kaen University, Khon Kaen 40002, Thailand |
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| Abstract: | A number of sterol biosynthesis-inhibiting (SBI) fungicides and plant growth regulator analogs were applied as root drenches to barley seedlings and their effect on the total sterol composition of the roots and shoots was measured by gas-liquid chromatography. Prochloraz was found to be inactive in this system, probably because of poor uptake, while the other compounds could be divided into two groups according to their mode of action as assessed by sterol profiling. The morpholines tridemorph and fenpropimorph inhibited the enzyme cycloeucalenol—obtusifoliol isomerase whereas triadimenol, nuarimol, paclobutrazol, and triapenthenol (RSW 0411) inhibited the enzyme responsible for the removal of the C-14 methyl group. Effects of individual diastereo-isomers and enantiomers of some compounds on sterol profiles were compared with their known fungicidal and anti-gibberellin properties. Shoot growth was reduced by all the compounds tested, paclobutrazol, nuarimol, and triapenthenol being the most effective. As well as inducing accumulation of abnormal sterols, SBI fungicide treatment changed the ratio of campesterol to stigmasterol and sitosterol. It is hypothesized that this may reflect changes in membrane architecture and may offer an explanation for the increased frost hardiness sometimes observed with SBI fungicide-treated plants. |
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