Effects of cytokinins on responses of bean leaves to chronic ozone treatment. |
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| Authors: | V C Runeckles H M Resh |
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| Affiliation: | 1. Department of Agriculture, Food and Environment, University of Pisa, Via del Borghetto 80, Pisa 56124, Italy;2. National Research Council, Via Madonna del Piano 10, Sesto Fiorentino, Florence 50019, Italy;3. CIRSEC, Centre for Climatic Change Impact, University of Pisa, Via del Borghetto 80, Pisa 56124, Italy;4. National Institute for Research and Development in Forestry “Marin Dracea”, B-dul Eroilor 128, Voluntari, Ilfov 077190, Romania;5. Transilvania University of Brasov, B-dul Eroilor 29, Brasov 500036, Romania;6. Research Centre for Forestry and Wood, Council for Agricultural Research and Economics, Arezzo, Italy;1. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, The Chinese Academy of Sciences, No. 20 Nanxincun, Xiangshan, Beijing 100093, PR China;2. University of Chinese Academy of Sciences, No. 19 Yuquanlu, Beijing 100049, PR China;3. Agriculture and Natural Resources Department, University of Minnesota Crookston, 2900 University Avenue, Crookston, MN 56716-5001, USA;1. Centre for Ecology & Hydrology, Environment Centre Wales, Deiniol Road, Bangor, Gwynedd LL57 2UW, United Kingdom;2. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Shuangqing Road 18, Haidian District, Beijing, 100085, China;3. College of Resources and Environment, University of Chinese Academy of Sciences, Shijingshan District, Beijing 100049, China;1. Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;2. Plant Science Research Unit, USDA-ARS, Raleigh, NC 27616, USA;3. Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China |
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| Abstract: | Treatment of primary leaves of bush bean (Phaseolus vulgaris L. var Pure Gold wax) with 30 μg cm−3N-6-benzyladenine or kinetin modified the effects of daily exposure to 0.05 or 0.10 μl l−1 ozone. Both cytokinins reduced the loss of chlorophyll caused by 0.10 μl l−1 ozone and stimulated leaf growth but neither prevented a decrease in stem and root weight caused by ozone treatment. 0.05 μl l−1 ozone also resulted in increased leaf growth and decreased stem and root growth, without appreciably affecting leaf chlorophyll as determined by spectral reflectance measurements of the upper leaf surface. The results suggest that cytokinins retard senescence and thereby modify the ozone response of treated tissues, but apparently offer little protection to the growth of the rest of the plant against either ozone dosage. |
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