Summary
Plants of white clover Trifolium repens were grown under the canopies of three grass species, Lolium perenne, Agrostis tenuis and Holcus lanatus, and under simulated canopies of black polythene and controls were exposed to unfiltered natural radiation. The canopies were adjusted so that they transmitted equal intensities of Photosynthetically Active Radiation (P.A.R.). The ratio of red to far red radiation (ζ) was unchanged under the black polythene canopies but was reduced under canopies of Lolium and Agrostis and even more so under Holcus. The effect of canopy filtered radiation on the growth of clover was greatly to reduced internode length, mean number of nodes, the number of branched nodes and the number of rooted nodes and greatly to increase petiole length. The effect of canopies of Holcus was greater than that of the other grass species both in its effect on ζ and on the responses of the clover plant to its shade.
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References
Clegg L (1987) The morphology of clonal growth and its relevance to the population dynamics of perennial plants. Ph.D. thesis, University of Wales
Davies A, Evans ME (1983) Branching in white clover. Working Group on Detailed Sward Measurement. Newsletter 12, Welsh Plant Breeding Station, Aberystwyth
Deregibus VA, Sanchez RA, Casal JJ, Trlica MJ (1985) Tillering response to enrichment of red light beneath the canopy in a humid natural grassland. J Appl Ecol 22:199–206
Gates DM (1981) Biophysical Ecology. Springer, New York
Harper JL (1985) Modules, branches and the capture of resources. In: Jackson JBC, Buss LW, Cook RE (eds) Population Biology and Evolution of Clonal Organisms. Yale University Press, New Haven, pp 1–33
Harvey J (1979) The regulation of vegetattve of vegetative reproduction. Ph.D. thesis, University of Wales
Holmes MG, Smith H (1977) The function of phytochrome in the natural environment. IV Light quality and plant development. Photochem/Photobiol 25:551–557
Smith H (1982) Light quality, photoperception and plant strategy. Ann Rev Plant Phys 33:481–518
Snaydon RW (1971) An analysis of competition between plants of Trifolium repens collected from contrasting soils. J Appl Ecol 8:687–697
Solangaarachchi SM (1985) The nature and control of branching pattern in Trifolium repens. Ph.D. thesis, University of Wales
Solangaarachchi SM, Harper JL (1987) The effect of canopy filtered light on the growth of white clover Trifolium repens. Oecologia (Berlin) (in press)
Stern WR, Donald CM (1962) Light relationships in grass-clover swards. Aust J Agric Res 13:599–614
Turkington R, Harper JL (1979) The growth, distribution and neighbourhood relationships of Trifolium repens in a permanent pasture. IV Fine-scale biotic differentiation. J Ecol 67:245–254
Woodward FI (1983) Instruments for the measurement of photosynthetically active radiation and red, far red and blue light. J Appl Ecol 20:103–115
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Thompson, L., Harper, J.L. The effect of grasses on the quality of transmitted radiation and its influence on the growth of white clover Trifolium repens . Oecologia 75, 343–347 (1988). https://doi.org/10.1007/BF00376935
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DOI: https://doi.org/10.1007/BF00376935