' The collection of papers presented is an excellent choice, covering a broad range of work. The range of approaches, from biochemical and cellular studies to discussion of ecological effects, represents the best of a modern, integrative approach to biology. Plants and UV-B is a fascinating volume, as much for its ability to highlight the gaps in current knowledge as for its broad and integrative approach. By raising so many questions, it should serve as a catalyst for future work. I highly recommend it for plant biologists and graduate students who are interested in biochemistry, physiology, ecology, and environmental sciences.' Thomas J. Herbert, Plant Science Bulletin

• Preface; Part I. The Ozone Layer and UV-B Radiation: 1. Ozone depletion in the Northern Hemisphere J. Pyle; 2. Monitoring changes in UV-B radiation A. Webb; 3. Action spectra for UV-B effects on plants: monochromatic and polychromatic approaches for analysing plant responses G. Holmes; Part II. Effects of UV-B on Plants at the Cellular Level: 4. DNA damage and repair in plants R. Taylor; 5. Genetic analysis of DNA repair mechanisms A. Britt; 6. Photosynthesis and photoinhibition N. Baker; 7. UV-B effects on the expression of genes encoding proteins involved in photosynthesis S. Mackerness; 8. UV-B perception and signal transduction G. Jenkins; 9. Ultraviolet radiation as a stress factor and the role of protective pigments J. Bornman; Part III. Effects of UV-B at the Whole Plant and Community Level: 10. Effects of UV-B on aquatic ecosystems D. Hader; 11. Assessing the impact of UV-B radiation on the growth and yield of field crops J. Corlett; 12. Effects of UV-B radiation on plants from agro-ecosystems and natural ecosystems J. Rozema; 13. Effects on subarctic vegetation of enhanced UV-B radiation L. Bjorn; 14. Impacts of elevated UV-B on forest ecosystems A. McLeod; 15. Effects of ultraviolet radiation and elevated CO2 on heathland communities S. Moody; 16. Alterations in competitive balance M. Caldwell; 17. Interactions between trophic levels N. Paul; Index.

' The collection of papers presented is an excellent choice, covering a broad range of work. The range of approaches, from biochemical and cellular studies to discussion of ecological effects, represents the best of a modern, integrative approach to biology. Plants and UV-B is a fascinating volume, as much for its ability to highlight the gaps in current knowledge as for its broad and integrative approach. By raising so many questions, it should serve as a catalyst for future work. I highly recommend it for plant biologists and graduate students who are interested in biochemistry, physiology, ecology, and environmental sciences.' Thomas J. Herbert, Plant Science Bulletin

• Preface; Part I. The Ozone Layer and UV-B Radiation: 1. Ozone depletion in the Northern Hemisphere J. Pyle; 2. Monitoring changes in UV-B radiation A. Webb; 3. Action spectra for UV-B effects on plants: monochromatic and polychromatic approaches for analysing plant responses G. Holmes; Part II. Effects of UV-B on Plants at the Cellular Level: 4. DNA damage and repair in plants R. Taylor; 5. Genetic analysis of DNA repair mechanisms A. Britt; 6. Photosynthesis and photoinhibition N. Baker; 7. UV-B effects on the expression of genes encoding proteins involved in photosynthesis S. Mackerness; 8. UV-B perception and signal transduction G. Jenkins; 9. Ultraviolet radiation as a stress factor and the role of protective pigments J. Bornman; Part III. Effects of UV-B at the Whole Plant and Community Level: 10. Effects of UV-B on aquatic ecosystems D. Hader; 11. Assessing the impact of UV-B radiation on the growth and yield of field crops J. Corlett; 12. Effects of UV-B radiation on plants from agro-ecosystems and natural ecosystems J. Rozema; 13. Effects on subarctic vegetation of enhanced UV-B radiation L. Bjorn; 14. Impacts of elevated UV-B on forest ecosystems A. McLeod; 15. Effects of ultraviolet radiation and elevated CO2 on heathland communities S. Moody; 16. Alterations in competitive balance M. Caldwell; 17. Interactions between trophic levels N. Paul; Index.

' The collection of papers presented is an excellent choice, covering a broad range of work. The range of approaches, from biochemical and cellular studies to discussion of ecological effects, represents the best of a modern, integrative approach to biology. Plants and UV-B is a fascinating volume, as much for its ability to highlight the gaps in current knowledge as for its broad and integrative approach. By raising so many questions, it should serve as a catalyst for future work. I highly recommend it for plant biologists and graduate students who are interested in biochemistry, physiology, ecology, and environmental sciences.' Thomas J. Herbert, Plant Science Bulletin

• Preface; Part I. The Ozone Layer and UV-B Radiation: 1. Ozone depletion in the Northern Hemisphere J. Pyle; 2. Monitoring changes in UV-B radiation A. Webb; 3. Action spectra for UV-B effects on plants: monochromatic and polychromatic approaches for analysing plant responses G. Holmes; Part II. Effects of UV-B on Plants at the Cellular Level: 4. DNA damage and repair in plants R. Taylor; 5. Genetic analysis of DNA repair mechanisms A. Britt; 6. Photosynthesis and photoinhibition N. Baker; 7. UV-B effects on the expression of genes encoding proteins involved in photosynthesis S. Mackerness; 8. UV-B perception and signal transduction G. Jenkins; 9. Ultraviolet radiation as a stress factor and the role of protective pigments J. Bornman; Part III. Effects of UV-B at the Whole Plant and Community Level: 10. Effects of UV-B on aquatic ecosystems D. Hader; 11. Assessing the impact of UV-B radiation on the growth and yield of field crops J. Corlett; 12. Effects of UV-B radiation on plants from agro-ecosystems and natural ecosystems J. Rozema; 13. Effects on subarctic vegetation of enhanced UV-B radiation L. Bjorn; 14. Impacts of elevated UV-B on forest ecosystems A. McLeod; 15. Effects of ultraviolet radiation and elevated CO2 on heathland communities S. Moody; 16. Alterations in competitive balance M. Caldwell; 17. Interactions between trophic levels N. Paul; Index.