• Baker, H. G. (1972). Human influences on plant evolution. Economic Botany 26, 3243.
  • Bell, J. N. B. (1985). SO2, effects on the productivity of grass species. In: Sulfur Dioxide and Vegetation (Ed. by W. E.Winner, H. A.Mooney, R. A.Goldstein), pp. 209226. Stanford University Press. Stanford .
  • Bell, J. N. B., Ayazloo, M. & Wilson, G. B. (1982). Selection for sulphur dioxide tolerance in grass populations in polluted areas. In: Urban Ecology (Ed. by R.Bornkamm, J. A.Lee & M. R. D.Seaward), pp. 171180. Black well Scientific Publications. Oxford , U.K .
  • Berrang, P., Karnosky, D. F. & Bennett, J. P. (1986). Natural selection for O3 tolerance in Populus tretnuloides: field verification. Canadian Journal of Forest Research 19, 519522.
  • Blum, U., Heagle, A. S., Burns, J. C. & Linthurst, R. A. (1983). The effects of O3 on fescue-clover forage: regrowth, yield and quality. Environmental and Experimental Rotany 23, 121132.
  • Bradshaw, A. D. (1976). Pollution and evolution. In: Effects of Air Polluumtz on Plants (Ed. by T. A.Mansfield), pp. 135139. Cambridge University Press.
  • Heagle, A. S., Phiibeck, R. B., Rogers, H. H. & Letchworth, M. B. (1979). Dispensing and monitoring O3 in open-top fiels chambers for plant-effects studies. Phytopathology 69, 1520.
  • Heagle, A. S., Rebbeck, J., Shafer, S. R., Lesser, V. M., Blum U. & Heck, W. W. (1989). Effects of lone-term O3 exposure and soil moisture deficit on growth of a white clover tall fescue-pasture. Phytopathology 79, 128136.
  • Heck, W.W., Philheck, R. B. & Dunnjing, J. A. (1978). A continuous stirred tank reactor (CSTR) system for exposing plants DO gaseous air contaminants: Agricultural Research Service, U.S. Dept. Agriculture, ARS-S-181, New Orleans. LA.
  • Horsman, D. C. (1980). Changes in southern Wisconsin white pint stands related to air pollution sensitivity. In: Proceedings of the Symposium on Effects of Air Pollutants on Mediterranean and Temperate Forest Ecosystems (Ed. by P. R. Miller), p. 239. General Technical Report PSW-+3 (Pacific Southwest Forest Experimental Station).
  • Horsman, D. C. Roberts T.M. & Brvishaw, A. D. (1979). Studies on the effect of sulphur dioxide on perennial ryegrass (Lolium pernne L.). II. Evolution of sulphur dioxide tolerance. Journal of Experimental Botany 30, 495502.
  • Houston, D. B. & Stairs, G. R. (1973). Genetic control of sulphur dioxide and ozone tolerance in eastern white pine. Forest Science 19, 267271.
  • Howell, R. K., Devine, T. E. & Hanson, C. H. (1971). Resistance of selected alfalfa strains to ozone. Crop Science 11, 114115.
  • Kress, L. W., Skelly, J. M. & Hinkelmann, K. H. (1982). Relative sensitivity of 18 full-sib families of Pinus taeda to Ozone. Canadian Journal of Forest Research 12, 203209.
  • Letchworth, M. B. & Blum, U. (1977). Effects of acute O3exposure on growth, nodulation, and nitrogen content of ladino Clover. Environmental Pollution 14, 303311.
  • Love, S. L., Rhodes, B. B. A Mover, J.W. (1987). Meristem culture and virus indexing of sweet potatoes. Manual of Techniques. International Board For Plant Genetic Resources. FAO, Rome. CO FAO United Nations, Viadelle Terme di Caraculla. 00100 Rome, Italy.
  • Mclaughlin, M. R., Rarnett, O. W., Gison, P. B. & Birhows, P. M. (1984). Enzyme-linked immunosorbent assay of viruses infecting forage legumes. Phytopathology 74, 965969.
  • Rebbeck, J., Blum, U. & Heagle, A. S. (1988). Effects of O3 on the regrowth and energy reserves of a ladino clover-tall fescue pasture. Journal of Applied Ecology 25, 659681.
  • Steiner, K. C & Davis, D. D. (1979). Variation among Fraxinus families in foliar response to ozone. Canadian Journal of Forest Research 9, 106109.
  • Taylor, G. E. Jr & Murdy, W. H. (1975). Population differentiations of an annual plant species Geranium carolinianum, in response to sulphur dioxide. Botanical Gazette (Chicago) 136, 212215.
  • Townsend, A. M. & Dochinger, L. S. (1974). Relationships of to seed source and environmental stage to the ozone tolerance of on Acer rubrum seedlings. Atmospheric Environment 8, 957964.
  • Treshow, M. (1968). The impact of air pollutants on plant popuations. Phytopathology 58, 11081113.
  • Wilson, G.B. & Bell, J.N.B. (1985). Studies on the tolerance to SO2 of grass populations in polluted areas. Iii. Investigations on the rate of development of tolerance. New Phytologist 100, 6377.