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Canopy apparent photosynthesis, respiration and yield in wheat

Published online by Cambridge University Press:  27 March 2009

Dong Shuting
Dong Shuting
Affiliation:
Deportment of Agronomy, Agricultural University of Shandong, Taian, Shandong Province, People's Republic of China
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Summary

Field experiments explored the relationship between canopy apparent photosynthesis (CAP) and grain yield and examined the effect of plant population density on CAP. Two cultivars of wheat were grown at five plant population densities in 1986 and 1987 in Taian, China. Measurements of CAP were made at intervals during the growth period by placing a large plastic-covered chamber over a 0·7 m2 segment of the canopy and measuring CO2 depletion with infra-red gas analysers for 1–2 min at c. 25 °C around noon when solar radiation was > 1100 umol/m2/s. Canopy respiration (CR) rates were measured by covering the whole chamber with a black screen in the daytime. Calculations of CAP and CR were made using the chamber volume, air temperature and changes in CO2 concentration over time and expressed on a land area basis.

Maximum values of CAP and CR were 4–6 g and 2–3 g CO2/m2/h, respectively, at the anthesis stage, decreasing with age during grain filling. The decrease was more rapid at the high than at the low population density. The difference in CAP between plant densities before booting and after anthesis could be attributed to reductions in leaf area index (LAI) and photosynthetic rate.

Grain yield also differed between plant population densities, the range being from 5250 to 7500 kg/ha in both years. Grain yield and 1000-grain weight were positively correlated with CAP during grain filling (r = 0·78 and 0·99, P < 0·01, 8 D.F.). Effects of plant density on CR were highly significant, but CR was not related to yield (r = 0·50).

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 122 , Issue 1 , February 1994 , pp. 7 - 12
Copyright
Copyright © Cambridge University Press 1994

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References

Anderson, M.C. & Denmead, O. T. (1969). Short wave radiation on inclined surfaces in model plant communities. Agronomy Journal 61, 867–872.CrossRefGoogle Scholar
Biscoe, P. V., Scott, R. K. & Monteith, J. L. (1975). Barley and its environment. III. Carbon budget of the stand. Journal of Applied Ecology 12, 269–291.CrossRefGoogle Scholar
Brinkman, M. A. & Frey, K. J. (1978). Flag leaf physiological analysis of oat isolines that differ in grain yield from their recurrent parents. Crop Science 18, 69–73.CrossRefGoogle Scholar
Charles-Edwards, D. A. (1978). An analysis of the photosynthesis and productivity of vegetative crops in the United Kingdom. Annals of Botany 42, 717–731.CrossRefGoogle Scholar
Evans, L. T. & Dunstone, R. L. (1970). Some physiological aspects of evolution in wheat. Australian Journal of Biological Sciences 23, 725–741.CrossRefGoogle Scholar
Evans, L. T., Wardlaw, I. F. & Fisher, R. A. (1975). Wheat. In Crop Physiology (Ed. Evans, L. T.), pp. 101–150. London: Cambridge University Press.Google Scholar
Fischer, R. A., Bidinger, F., Syme, J. R. & Wall, P. C. (1981). Leaf photosynthesis, leaf permeability, crop growth, and yield of short spring wheat genotypes under irrigation. Crop Science 21, 367–373.CrossRefGoogle Scholar
Garrity, D. P., Sullivan, C. Y. & Watts, D. G. (1984). Rapidly determining sorghum canopy photosynthetic rates with a mobile field chamber. Agronomy Journal 76, 163–165.CrossRefGoogle Scholar
Gent, M. P. N. & Kiyomoto, R. K. (1985). Comparison of canopy and flag leaf net carbon dioxide exchange of 1920 and 1977 New York winter wheats. Crop Science 25, 81–86.CrossRefGoogle Scholar
Johnson, R. C., Witters, R. E. & Ciha, A. J. (1981). Apparent photosynthesis, evapotranspiration, and light penetration in two contrasting hard red winter wheat canopies. Agronomy Journal 73, 419–422.CrossRefGoogle Scholar
McCullough, D. E. & Hunt, L. A. (1989). Respiration and dry matter accumulation around the time of anthesis in field stands of winter wheat (Triticum aeslivum). Annals of Botany 63, 321–329.CrossRefGoogle Scholar
Monteith, J. L. & Unsworth, M. H. (1990). Principles of Environmental Physics. London: Butterworths.Google Scholar
Planchon, C. (1969). Photosynthetic activity and yield in soft wheat (Triticum aeslivum L). Genetics of Agriculture 23, 485–490.Google Scholar
Puckridge, D. W. (1971). Photosynthesis of wheat under field conditions. III. Seasonal trends in carbon dioxide uptake of crop communities. Australian Journal of Agricultural Research 22, 1–9.CrossRefGoogle Scholar
Shimshi, D. & Ephrat, J. (1975). Stomatal behaviour of wheat cultivars in relation to their transpiration, photosynthesis and yield. Agronomy Journal 67, 326–331.CrossRefGoogle Scholar
Stoy, V. (1963). The translocation of C14-labelled photosynthetic products from the leaf to the ear in wheat. Physiologia Plantarum 16, 851–866.CrossRefGoogle Scholar