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The effect of plant density on tiller growth and morphology in barley

Published online by Cambridge University Press:  27 March 2009

E. J. M. Kirby
Affiliation:
Plant Breeding Institute, Trumpington, Cambridge, CB2 2LQ

Summary

A detailed study was made of the tillering of barley plants grown at densities which ranged from 50 to 1600 plants m–2. Throughout the season the initiation of tiller buds and their growth in length and leaf number were followed, and measurements were made of leaf sheath and lamina length and lamina width. A proportion of tillers died and their positions and times of death are given.

Three phases of tillering were recognized. The first, tiller bud initiation, was little affected directly by density. During the second phase, buds did not grow or did grow and emerge from the subtending leaf sheath. If they grew, there was no difference in growth rate of tillers at different densities. At the higher densities fewer buds developed, and the morphology of those tillers which did grow was affected by density. This suggests that the growth of the tiller bud may be controlled by levels of endogenous gibberellin, while in the final stage, growth after emergence from the subtending leaf sheath, competition for light appears to be the factor which determines whether a tiller survives to produce an ear. The data are discussed in relation to the practical importance of tillering.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1972

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References

REFERENCES

Aspinall, D. (1961). The control of tillering in the barley plant. Aust. J. biol. Sci. 14, 493505.CrossRefGoogle Scholar
Donald, C. M. (1968). The breeding of orop ideotypes. Euphytica 17, 385403.CrossRefGoogle Scholar
Duncan, W. G. (1969). Cultural manipulation for higher yields. In Physiological Aspects of Crop Yield, ed. Eastin, J. D., Haskins, F. A. and Sullivan, C. Y., pp. 327–39. Madison, Wisconsin: American Society of Agronomy and Crop Science Society of America.Google Scholar
Evans, L. T., Wardlaw, I. F. & Williams, C. N. (1964). Environmental control of growth. In Qrasses and Orasslands, ed. Barnard, C., pp. 102–25. London: Macmillan.Google Scholar
Grant, D. R. (1970). Some measurements of evaporation in a field of barley. J. agric. Sci., Camb. 75, 433–43.CrossRefGoogle Scholar
Kirby, E. J. M. (1967). The effect of plant density upon the growth and yield of barley. J. agric. Sci., Camb. 68, 317–24.CrossRefGoogle Scholar
Kirby, E. J. M. (1969). The effect of sowing date and plant density on barley. Ann. appl. Biol. 63, 513–21.CrossRefGoogle Scholar
Kirby, E. J. M. (1970). Evapotranspiration from barley grown at different densities. J. agric. Sci., Camb. 75, 445–50.CrossRefGoogle Scholar
Kirby, E. J. M. & Faris, D. G. (1970). Plant population induced growth correlations in the barley plant main shoot and possible hormonal mechanisms. J. exp. Bot. 21, 787–98.CrossRefGoogle Scholar
Langer, R. H. M. (1956). Growth and nutrition of Timothy (Phleum pratense).1. The life history of individual tillers. Ann. appl. Biol. 44, 166–87.CrossRefGoogle Scholar
Mitchell, K. J. (1953). Influence of light and temperature on the growth of ryegrass (Loliumspp). 1. Pattern of vegetative development. Physiologia PI. 6, 2146.CrossRefGoogle Scholar
Percival, J. (1921). The Wheat Plant. London: Duckworth and Co.Google Scholar
Rawson, H. M. & Donald, C. M. (1969). The absorption and distribution of nitrogen after floret initiation in wheat. Aust. J. agric. Res. 20, 799808.CrossRefGoogle Scholar