Effect of dichlorophenyl dimethylurea (DCMU) on source strength and remobilization of stem water-soluble carbohydrates in wheat under terminal drought

Document Type : Research Paper

Authors

1 Assistant Professor, Department of Agronomy and Plant Breeding, Vali-e-Asr University of Rafsanjan, Iran

2 M. Sc. Graduate in Agronomy, Department of Agronomy and Plant Breeding, Vali-e-Asr University of Rafsanjan, Iran

3 Associate Professor, Department of Agronomy and Plant Breeding, Vali-e-Asr University of Rafsanjan, Iran

Abstract

In order to study the role of photosynthetic tissues on grain filling and remobilization of stem reserves under terminal drought, a pot experiment as semi-field was conducted as two-factor factorial in complete randomized design with three replicates at research farm of Agriculture college of Vali – e – Asr University of Rafsanjan during January to June 2012 . First factor was source strength reduction in three levels as control, inhibition of flag leaf photosynthesis and inhibition of photosynthesis of leaves below flag leaf. The second factor was watering regime including normal watering and water withholding after flowering. Photosynthesis inhibition was applied by DCMU. Results showed that only inhibition of flag leaf photosynthesis decreased starch content but increased grain protein content. However mean grain weight was not significantly affected by this treatment. At maturity and in normal watering regime, stem water soluble carbohydrates (WSC) content was not significantly affected by source strength reduction treatments, while water withholding significantly increased it. The highest WSC content was observed in inhibition of photosynthesis of leaves below flag leaf.  On the other hand, neither source strength reduction treatments nor watering regimes, had significant effect on stem nitrogen content. Results suggest that source strength reduction induced by inhibition of photosynthesis may lead to decreased sink demand for photoassimilate and nitrogen and consequently decreased remobilization efficiency.

Keywords

References

  1. Allen, J. F., & Holmes, N. G. (1986). A general model for regulation of photosynthetic unit function by protein phosphorylation. FEBS letters, 202, 175-181.
  2. Azcón-Bieto, J. (1983). Inhibition of photosynthesis by carbohydrates in wheat leaves. Plant Physiology, 73, 681-686.
  3. Bort,J., Febrero, A., Amaro, T. & Araus, J. (1994).Role of awns in ear water-use efficiency and grain weight in barley. Agronomie, 14, 133-139.
  4. Bremner, C. (1965). A manual colorimetric procedure for measuring ammonium nitrogen in soil and plant Kjeldahl digests. Communications in Soil Science and Plant Analysis, 20, 961-969.
  5. Bremner, P. (1972). Accumulation of dry matter and nitrogen by grains in different positions of the wheat ear as influenced by shading and defoliation. Australian Journal of Biological Sciences, 25: 657-668.
  6. Blum, A. (1996). Constitutive traits affecting plant performance under stress. African Journal of Biotechnology, 3, 136-145.
  7. Blum, A. (1998). Improving wheat grain filling under stress by stem reserve mobilization. Euphytica, 100, 77–83.
  8. Bonnett, G. & Incoll, L. (1992). The potential pre-anthesis and post-anthesis contributions of stem internodes to grain yield in crops of winter barley. Annals of Botany, 69, 219-225.
  9. Callum, J. A. (1989). Biochemistry of phenolic compounds in wheat grain (Triticum aestivum L.). Field Crops Research, 12, 38-58.
  10. Davidson, D. J. & Chevalier P. M. (1992). Storage and remobilization of water-soluble carbohydrates in stems of spring wheat .Crop Science, 32,186-190.
  11. Dimmock, J. & Gooding, M. J. (2002). The effects of fungicides on rate and duration of grain filling in winter wheat in relation to maintenance of flag leaf green area. Journal of Agricultural Science, 138, 1-16.
  12. Emam, Y. (2004). Pre-anthesis reserve utilization for protein and carbohydrate synthesis in grains of wheat. Plant Physiology, 121, 871–878.
  13. Evans, L.T., Bingham, J., Jackson, P. & Sutherland, J. (1972). Effect of awns and drought on the supply of photosynthates and its distribution within wheat ears. Annals of Applied Biology, 70, 67-76.
  14. Gallais, A. & Hirel, B. (2004). An approach to the genetics of nitrogen use efficiency in maize. Journal of. Experimental Botany, 55, 295-306.
  15. Hodge, J. E. & Hofreiter, B. T. (1962). Methods in carbohydrate chemistry. Academic Press 1, 380-394.
  16. Hossain, A., Sears, R., Cox, T. & Paulsen, G. (1990). Desiccation tolerance and its relationship to assimilate partitioning in winter wheat. Crop Science, 30, 622-627.
  17. Kerepesi, I. & Galiba, G. (2000). Osmotic and salt stress-induced alteration in soluble carbohydrate content in wheat seedlings. Crop Science, 40, 482-487.
  18. King, R., Wardlaw, I. & Evans, L. T. (1967). Effect of assimilate utilization on photosynthetic rate in wheat. Planta, 77, 261-276.
  19. Knapp, J., Harms, C. & Volenec, J. (1987). Growth regulator effects on wheat culm nonstructural and structural carbohydrates and lignin. Crop Science, 27, 1201-1205.
  20. Kulandaivelu, G. & Daniell, H. (2006). Dichlorophenyl dimethylurea (DCMU) induced increase in chlorophyll a fluorescence intensity–An index of photosynthetic oxygen evolution in leaves, chloroplasts and algae. Physiologia Plantarum, 48, 385-388.
  21. Lauer, J. G. & Simmons, S. R. (1985). Photoassimilate partitioning of main shoot leaves in field-grown spring barley. Crop Science, 25, 851-855.
  22. Maydup, M., Antonietta, M., Guiamet, J., Graciano, C., López, J.R. & Tambussi, E. (2010). The contribution of ear photosynthesis to grain filling in bread wheat (Triticum aestivum L.). Field Crops Research, 119, 48-58.
  23. Madahhosseini, S., Poustini, K., & Ahmadi, A. (2008). Effects of foliar application of BAP on source and sink strength in four six-rowed barley (Hordeum vulgare L.) cultivars. Plant Growth Regulation, 54, 231-239.
  24. Mu, H., Jiang, D., Wollenweber, B., Dai, T., Jing, Q. & Cao, W. (2010). Long‐term low radiation decreases leaf photosynthesis, photochemical efficiency and grain yield in winter wheat. Journal of Agronomy and Crop Science, 196, 38-47.
  25. Nelson, N. (1994). A photometric adaptation of the Somogyi method for the determination of glucose. Journal of Biology, 153, 375-380.
  26. Ozturk, A. & Aydin, F. (2004). Effect of water stress at various growth stages on some quality characteristics of winter wheat. Journal of Agronomy and Crop Science, 190, 93-99.
  27. Savin, R. & Nicolas, M.E. (1996). Effects of short periods of drought and high temperature on grain growth and starch accumulation of two malting barley cultivars. Functional Plant Biology, 23, 201-210.
  28. Shah, N. & Paulsen, G. (2003). Interaction of drought and high temperature on photosynthesis and grain-filling of wheat. Plant and Soil, 257, 219-226.
  29. Shatilov, A., Johansson, E. & Oscarson, P. (1996). Nitrogen redistribution from the roots in post-anthesis plants of spring wheat. Plant and Soil, 269, 321-332.
  30. Schnyder, H. (2006). The role of carbohydrate storage and redistribution in the source sink relations of wheat and barley during grain filling. New Phytologist, 123: 233-245.
  31. Singh, K., Singh, S. & Singh, G. (1995). Relationship of physiological attributes with yield components in bread wheat (T. aestivum L.) under rainfed condition. Plant Science, 15, 11-14.
  32. Verma, V., Foulkes, M. J., Worland, A. J., Sylvester-Bradley, R., Caligari, P. D. S. & Snape, J. W. (2004). Mapping quantitative trait loci for flag leaf senescence as a yield determinant in winter wheat under optimal and drought-stressed environments. Euphytica 135, 255-263.
Iranian Journal of Field Crop Science
Volume 46, Issue 3 - Serial Number 3
October 2015
Pages 405-412

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History

  • Receive Date: 28 February 2014
  • Revise Date: 17 June 2015
  • Accept Date: 11 July 2015
  • Publish Date: 23 September 2015

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