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Analysis of post-flowering compensatory growth in winter oilseed rape (Brassica napus)

Published online by Cambridge University Press:  27 March 2009

A. M. Tommey  and
E. J. Evans
A. M. Tommey
Affiliation:
Department of Agriculture, The University, Newcastle upon Tyne NE1 7RU, UK
E. J. Evans
Affiliation:
Department of Agriculture, The University, Newcastle upon Tyne NE1 7RU, UK
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Summary

Patterns of assimilate distribution in single plants of winter oilseed rape (Brassica napus L.) cv. Mikado, following a reduction in sink capacity at flowering were investigated in two field experiments during the 1985/86 and 1986/87 growing seasons at Cockle Park Experimental Station, Northumberland. Plants demonstrated considerable compensatory growth following the removal of flowers from the terminal raceme and primary branches.

Flower removal from lower branches did not significantly reduce total seed weight. Plants with a pod-bearing terminal raceme and one, two or three productive higher-order branches yielded a similar amount of seed. When seed production was confined to the terminal raceme and first four primary branches, seed yield per plant was greatly increased. Removal of flowers from the terminal raceme and uppermost branches of plants increased the number and productivity of lower-order branches but not enough to offset the overall loss in seed yield potential per plant. Indeed, when flowers were removed from higher-order racemes, the reduction in total seed weight per plant, was directly related to the degree of flower removal. The additional seed yield obtained from individual branches of modified plants in both experiments arose largely through an increase in fertile pod number and seed number per pod. Flower removal treatments did not greatly influence mean seed weight.

The results clearly demonstrated that the loss of flowers from lower-order branches could be tolerated and may even be beneficial. Conversely, the removal of flowers from higher-order branches resulted in significant yield reductions. The production of lower branches should be restricted, therefore, in order to increase the superiority of the terminal raceme and uppermost branches and to increase the overall production efficiency of the crop canopy.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 118 , Issue 3 , June 1992 , pp. 301 - 308
Copyright
Copyright © Cambridge University Press 1992

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References

REFERENCES

Allen, E. J. & Morgan, D. G. (1975). A quantitative comparison of growth, development and yield of different varieties of oilseed rape. Journal of Agricultural Science, Cambridge 85, 159–174.CrossRefGoogle Scholar
Bilsborrow, P. E. & Norton, G. (1984). A consideration of factors affecting the yield of oilseed rape. Aspects of Applied Biology 6, 91–99.Google Scholar
Brar, G. & Thies, W. (1977). Contribution of leaves, stems, siliques and seeds to dry matter accumulation in ripening seeds of rapeseed Brassica napus L. Zeilschrift für Pflanzenphysiologie 82, 1–13.CrossRefGoogle Scholar
Chapman, J. F., Daniels, R. W. & Scarisbrick, D. H. (1984). Field studies in 14C-assimilate fixation and movement in oilseed rape (Brassica napus). Journal of Agricultural Science, Cambridge 102, 23–31.CrossRefGoogle Scholar
Clarke, J. M. (1979). Intra-plant variation in number of seeds per pod and seed weight in Brassica napus cv. ‘Tower’. Canadian Journal of Plant Science 59, 959–962.CrossRefGoogle Scholar
Cook, M. G. & Evans, L. T. (1978). Effect of relative sink size and distance of competing sinks on the distribution of photosynthetic assimilates in wheat. Australian Journal of Plant Physiology 5, 495–509.Google Scholar
Daniels, R. W. & Scarisbrick, D. H. (1983). Oilseed rape physiology. National Agricultural Centre Course Papers, pp. 29–46.Google Scholar
Daniels, R. W., Scarisbrick, D. H. & Mohammud, B. S. (1983). The influence of chemicals with anti-gibberellin activity on growth, development and yield of oilseed rape (Brassica napus L.). In Proceedings of the 6th International Rapeseed Congress, Paris, France, pp. 72–77.Google Scholar
Evans, E. J. (1984). Pre-anthesis growth and its influence on seed yield in winter oilseed rape. Aspects of Applied Biology 6, 81–90.Google Scholar
Ghobashi, A. A. E. (1983). Defoliation and shading studies in winter oilseed rape (Brassica napus L.). PhD Thesis, University of Newcastle upon Tyne.Google Scholar
Islam, N. (1987). Effects of nitrogen fertilizer on the growth and yield of oilseed rape (Brassica napus L.). PhD Thesis, University of Newcastle upon Tyne.Google Scholar
Keiller, D. R. & Morgan, D. G. (1988). Distribution of 14C-labelled assimilates in flowering plants of oilseed rape (Brassica napus L.). Journal of Agricultural Science, Cambridge 111, 347–355.CrossRefGoogle Scholar
Major, D. G. & Charnetski, W. H. (1976). Distribution of labelled assimilates in rape plants. Crop Science 16, 530–532.CrossRefGoogle Scholar
McGregor, D. I. (1981). Patterns of flower and pod development in rapeseed. Canadian Journal of Plant Science 59, 819–830.Google Scholar
Mendham, N. J. & Scott, R. K. (1975). The limiting effect of plant size at inflorescence initiation on subsequent growth and yield of oilseed rape (Brassica napus). Journal of Agricultural Science, Cambridge 84, 487–502.CrossRefGoogle Scholar
Mendham, N. J., Shipway, P. A. & Scott, R. K. (1981). The effects of delayed sowing and weather on growth, development and yield of winter oilseed rape (Brassica napus) Journal of Agricultural Science, Cambridge 96, 389–416.CrossRefGoogle Scholar
Sylvester-Bradley, R. & Makepeace, R. J. (1984). A code for stages of development in oilseed rape. Aspects of Applied Biology 6, 399–419.Google Scholar
Tayo, T. O. & Morgan, D. G. (1975). Quantitative analysis of growth, development and distribution of flowers and pods in oilseed rape (Brassica napus L.). Journal of Agricultural Science, Cambridge 85, 103–110.CrossRefGoogle Scholar
Tayo, T. O. & Morgan, D. G. (1979). Factors influencing flower and pod development in oilseed rape (Brassica napus L.). Journal of Agricultural Science, Cambridge 92, 363–373.CrossRefGoogle Scholar
Tommey, A. M. (1988). The control of flowering in oilseed rape (Brassica napus L.) and its influence on yield potential. PhD Thesis, University of Newcastle upon Tyne.Google Scholar
Yates, D. J. & Steven, M. D. (1987). Reflexion and absorption of solar radiation by flowering canopies of oilseed rape (Brassica napus L.). Journal of Agricultural Science, Cambridge 109, 495–502.CrossRefGoogle Scholar