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    Trethewey, JAK Rolston, MP McCloy, BL and Chynoweth, RJ 2016. The plant growth regulator, trinexapac-ethyl, increases seed yield in annual ryegrass (Lolium multiflorumLam.). New Zealand Journal of Agricultural Research, Vol. 59, Issue. 2, p. 113.
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    WARRINGA, J. W. and MARINISSEN, M. J. 1996. The effect of light intensity after anthesis on dry matter distribution and seed yield of Lolium perenne L.. Grass and Forage Science, Vol. 51, Issue. 1, p. 103.
    WILTSHIRE, J. J. J. HEBBLETHWAITE, P. D. ESSLEMONT, R. E. and McGILLOWAY, D. A. 1989. The use of growth regulator RSW0411 in seed crops of Lolium perenne L.. Grass and Forage Science, Vol. 44, Issue. 2, p. 139.
    Elgersma, A. and Śnieżko, R. 1988. Cytology of seed development related to floret position in perennial ryegrass (Lolium perenne L.). Euphytica, Vol. 39, Issue. S3, p. 59.
    HAMPTON, J. G. CLEMENCE, T. G. A. and HEBBLETHWAITE, P. D. 1987. The effect of lodging on 14C-assimilate distribution after anthesis in Lolium perenne, CV. S24, grown for seed. Grass and Forage Science, Vol. 42, Issue. 2, p. 121.
    HAMPTON, J. G. and HEBBLETHWAITE, P. D. 1985. The effect of the growth regulator paclobutrazol (PP333) on the growth, development and yield of Lolium perenne grown for seed. Grass and Forage Science, Vol. 40, Issue. 1, p. 93.
    HAMPTON, J. G. and HEBBLETHWAITE, P. D. 1985. The effect of growth retardant application on floret site utilisation and assimilate distribution in ears of perennial ryegrass cv. S.24. Annals of Applied Biology, Vol. 107, Issue. 1, p. 127.
    HAMPTON, J. G. CLEMENCE, T. G. A. and HEBBLETHWAITE, P. D. 1983. Nitrogen studies in Lolium perenne grown for seed. IV. Response of amenity types and influence of a growth regulator. Grass and Forage Science, Vol. 38, Issue. 2, p. 97.
    Hebblethwaite, P. D. Burbidge, A. and Wright, D. 1978. Lodging studies in Lolium perenne grown for seed: 1. Seed yield and seed yield components. The Journal of Agricultural Science, Vol. 90, Issue. 02, p. 261.
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Lodging studies in Lolium perenne grown for seed: 2. floret site utilization

  • A. Burbidge (a1), P. D. Hebblethwaite (a1) and J. D. Ivins (a1)
Summary

In these experiments lodging not only decreased the number of seeds harvested, but also had an effect in determining which spikelets on the ear set most seed. These data have also shown that many more seeds are set than are harvested, even when the crop is not lodged. It is suggested that there is a lack of assimilate supply to fill the developing seeds, some of which abort, allowing the remainder to attain a viable seed weight. Mechanical support of the crop may increase the assimilate supply to the seed thus allowing seed further up the ear and spikelet to develop fully.

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COPYRIGHT: © Cambridge University Press 1978
References
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Anslow, R. C. (1963). Seed formation in perennial ryegrass. I. Anther exsertion and seed set. Journal of the British Grassland Society 18, 90–6.
Anslow, R. C. (1964). Seed formation in perennial ryegrass. II. Maturation of seed. Journal of the British Grassland Society 19, 349–57.
Evans, A. W. (1976). Report on the final years results of the seed production assessment trials on ryegrass varieties for 1975 harvest and a summary of results for 1972–1975. National Institute of Agricultural Botany, 03 1976.
Evans, L. T., Wardlaw, I. F. & Fischer, R. A. (1975). Wheat. In Crop Physiology: Some Case Histories (ed. Evans, L. T.), pp. 101–49. Cambridge University Press.
Gregor, J. W. (1928). Pollination and seed production in the ryegrasses (Lolium perenne and Lolium italicum). Transactions Royal Society, Edinburgh 55, 773–94.
Griffiths, D. J., Roberts, H. M. & Lewis, J. (1973). The seed yield potential of grasses. Report of the Welsh Plant Breeding Station for 1973, pp. 117–23.
Hebblethwaite, P. D. (1977). Irrigation and nitrogen studies in S. 23 ryegrass grown for seed. I. Growth, development, seed yield components and seed yield. Journal of Agricultural Science, Cambridge 88, 605–14.
Hebblethwaite, P. D., Burbidge, A. & Wright, D. (1978). Lodging studies in Lolium perenne grown for seed. 1. Seed yield and seed yield components. Journal of Agricultural Science, Cambridge 90, 261–7.
Hill, M. J. & Watkin, B. R. (1975). Seed production studies on perennial ryegrass, timothy and prairie grass. 1. Effect of tiller age on tiller survival, ear emergence and seed head components. Journal of the British Grassland Society 30, 63–71.
Rawson, H. M. & Evans, L. T. (1970). The pattern of grain growth within the ear of wheat. Australian Journal of Biological Science 23, 753–63.
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The Journal of Agricultural Science
  • ISSN: 0021-8596
  • EISSN: 1469-5146
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