Abscisic acid synthesis and metabolism in barley leaves and protoplasts |
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| Institution: | 1. Animal Morphology and Physiology Department, Federal Rural University of Pernambuco, Rua Dom Manoel de Medeiros, s/n, Dois Irmãos, CEP: 52171-900 Recife, Pernambuco, Brazil;2. Parasitology Department, Federal University of Amazonas, Av. General Rodrigo Octávio Jordão Ramos, n. 3000, Campus Universitário, Coroado I, CEP: 69077-000 Manaus, Amazonas, Brazil;3. Department of Civil, Chemical and Environmental Engineering, Pole of Chemical Engineering, Genoa University, Via Opera Pia 15, 1-16145 Genova, Italy;4. Centre for Sciences and Technology, Catholic University of Pernambuco, Rua do Príncipe, n. 526, Bl D, Boa Vista, CEP: 50050-900 Recife, Pernambuco, Brazil;5. Advanced Institute of Technology and Innovation (IATI), Rua Joaquim de Brito, 216, Boa Vista, Zip Code: 50070-280 Recife, Pernambuco, Brazil;1. Low Carbon Economy (LCE) Group, Chemical Engineering Discipline, School of Engineering, Monash University, Jalan Lagoon Selatan, 46150 Bandar Sunway, Selangor, Malaysia;2. Low Carbon Economy (LCE) Group, School of Chemical Engineering, Universiti Sains Malaysia, Engineering Campus, Seri Ampangan, 14300 Nibong Tebal, Pulau Pinang, Malaysia;1. Community Medicine, Melaka Manipal Medical College, Manipal, Manipal Academy of Higher Education, Manipal, India;2. Community Medicine, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, India;3. Public Health (MSW Program), Prasanna School of Public Health (PSPH), Manipal, Manipal Academy of Higher Education, Manipal, India;4. Department of Data Science, Prasanna School of Public Health, (PSPH), Manipal, Manipal Academy of Higher Education, Manipal, India;5. Paediatrics, Melaka Manipal Medical College, Manipal, Manipal Academy of Higher Education, Manipal, India;6. Dr. AV Baliga Memorial Hospital, Udupi, India;1. Center for Retrovirus Research, Department of Veterinary Biosciences, The Ohio State University, Columbus, OH 43210, USA;2. Department of Medicine, Division of Molecular Oncology, Washington University School of Medicine, St. Louis, MO, 63110, USA |
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| Abstract: | Protoplasts isolated from barley (Hordeum vulgare L. cv. Clipper) leaves contained abscisic acid (ABA). The ABA content of these protoplasts did not change when they were incubated for up to 6 h in media of decreasing osmotic potential. There was a substantial, but transient, increase in ABA in barley leaf segments during protoplast isolation. The magnitude of this increase was inversely dependent on the osmotic potential of the isolation medium. Maximum ABA content was recorded after 2 h of exposure to the sorbitol-containing medium. The subsequent decline was due to conversion of ABA to phaseic acid (PA) and to other metabolites.Barley mesophyll protoplasts were not able to metabolise ABA, PA or any of the other metabolites formed from ABA by intact leaf tissue. |
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