Chloroplast superoxide and hydrogen peroxide scavenging systems from pea leaves: Seasonal variations |
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| Affiliation: | 1. Department of Aerospace Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States;2. Department of Pediatrics-Division of Pediatric Endocrinology, University of Michigan Health System, Ann Arbor, Michigan 48109, United States;3. Department of Radiology, Section of Pediatric Radiology University of Michigan Health System, Ann Arbor, Michigan 48109, United States;1. Department of Water Resources and Environment, Sun Yat-sen University, Guangzhou 510275, China;2. Key Laboratory of Water Cycle and Water Security in Southern China of Guangdong High Education Institute, Sun Yat-sen University, Guangzhou 510275, China;3. Guangdong Provincial Key Laboratory of Urbanization and Geo-simulation, School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China;4. Department of Biological and Agricultural Engineering and Zachry Department of Civil Engineering, Texas A&M University, College Station, TX, USA;5. College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China;6. Department of Geography, University of Cincinnati, Cincinnati, OH 45221-0131, United States |
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| Abstract: | Levels of chloroplast antioxidants and enzymes that scavenge oxygen racidals were followed in the leaves of pea plants (Pisum sativum L. cv. Meteor) grown under glasshouse conditions between April 1984 and May 1985. While little variation in pigment levels or superoxide dismutase activity was detected during this period, plants grown in early summer (May–June) contained appreciably higher levels of ascorbate, ascorbate peroxidase and glutathione reductase than plants grown in winter (Dec–Jan.). The role of light intensity in regulating levels of chloroplast antioxidants was examined further using pea plants grown in a constant environment chamber under 100 or 400 μmol m−2 s −1 photon flux density. Chloroplasts isolated from plants grown at the higher light intensity contained significantly higher levels of ascorbate, ascorbate peroxidase, glutathione reductase and dehydroascorbate reductase. These data suggest that light intensity may have an important influence on the level and activity of chloroplast antioxidants and oxygen radical scavenger enzymes. |
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