Further studies on the amino acids and proteins of sulfur-deficient alfalfa |
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| Authors: | MERTZ E T MATSUMOTO H |
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| Affiliation: | 1. State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Agro-product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou, China;2. Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Diseases and Pest Insects, Ministry of Education, Nanjing, 210095, China;3. Guangxi Key Laboratory of Sugarcane Biology, College of Agriculture, Guangxi University, 100 Daxue Rd., 8, Nanning, Guangxi, 530004, PR China;4. College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China;5. Department of Plant Pathology, Citrus Research and Education Center, University of Florida, 700 Experiment Station Rd, Lake Alfred, FL, 33850, USA;6. Department of Agricultural Botany, Faculty of Agriculture, Tanta University, Tanta, Egypt;7. Department of Entomology, Faculty of Crop Protection, Sindh Agriculture University Tando Jam, Sindh, Pakistan;8. Faculty of Agriculture, Lasbela University of Agriculture, Water and Marine Sciences, Uthal, 90150, Balochistan, Pakistan;9. Department of Environmental Sciences and Engineering, Government College University Allama Iqbal Road, 38000, Faisalabad, Pakistan;10. Agricultural Research Station, Office of VP for Research & Graduate Studies, Qatar University, 2713, Doha, Qatar;11. Lushan Botanical Garden, Chinese Academy of Sciences, Jiujiang, Jiangxi, 332900, China;1. Pharmaceutical Technology Department, National Research Centre, Dokki, Cairo 12622, Egypt;3. Department of Microbiology and Immunology, Faculty of Pharmacy, Cairo University, Cairo, Egypt;4. Department of Pharmacology and Toxicology, Faculty of Pharmacy, Cairo University, Cairo, Egypt;1. Civil Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi, Selangor Darul Ehsan, 43600, Malaysia;2. Institute of Tropical Biodiversity and Sustainable Development, Universiti Malaysia Terengganu, Kuala Nerus, Terengganu Darul Iman, 21030, Malaysia;3. Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi, Selangor Darul Ehsan, 43600, Malaysia;4. Department of Civil Engineering, Universiti Tenaga Nasional, Jalan Ikram-Uniten, Kajang, Selangor Darul Ehsan, 43000, Malaysia;5. Faculty of Science and Marine Environment, Universiti Malaysia Terengganu, Kuala Nerus, Terengganu Darul Iman, 21030, Malaysia;6. Faculty of Fisheries and Food Science, Universiti Malaysia Terengganu, Kuala Nerus, Terengganu Darul Iman, 21030, Malaysia;1. College of Mechanical and Electrical Engineering, Fujian Agriculture and Forestry University, Fuzhou 310002, PR China;2. College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 310002, PR China;3. Fujian Colleges and Universities Engineering Research Center of Modern Agricultural Equipment, Fuzhou 310002, PR China |
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| Abstract: | Sulfur-deficient alfalfa plants grown in sand culture were separated into leaf and stem, and the leaf was separated into particulate, cytoplasmic protein, and cytoplasmic nonprotein fractions. The levels of several amino acids were determined in all fractions, and the cytoplasmic protein fraction was examined by electrophoresis.The net effect of sulfur deficiency on the nitrogen metabolism of alfalfa is a shift from protein synthesis to increased synthesis of water-soluble, nonprotein nitrogen compounds. This is shown by a marked drop in the level of the major protein of alfalfa leaf cytoplasm, with a smaller relative increase in the level of minor cytoplasmic protein components, a change not observed heretofore with a simple nutritional deficiency. In addition, asparagine and arginine accumulate in the water-soluble, nonprotein fraction of the leaf, with a compensating decrease in the level of leaf particulate and cytoplasmic proteins. |
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