Abstract
The components of grain yield are altered by adverse growing conditions as the effects of certain environmental factors on crop growth and yield differ depending upon the developmental stages when these conditions occur. Path-coefficient analysis was used to investigate the main processes influencing grain yield and its formation under Mediterranean conditions. Twenty-five durum wheat genotypes, consisting of four Spanish commercial varieties and 21 inbred lines from the ICARDA durum wheat breeding program, were grown during 1997 and 1998 under both rainfed and irrigated conditions in southern Spain. {P}ath-coefficient analysis revealed that under favourable conditions grain yield depended in equal proportion on the three primary yield components (i.e. spikes m−2, grains spike−1, and mean grain weight), whereas in the rainfed experiments, variations in grain yield were due mainly to spikes m−2 and to a lesser extent to grains spike−1. Compensatory effects were almost absent under irrigated treatments; however, under water shortage, spikes m−2 exerted a negative influence on grain spike−1 due mainly to a negative interrelationship between tiller production and apical development. These compensatory effects could partially explain the restricted success in durum wheat breeding observed in water-limited environments of the Mediterranean region. Under rainfed conditions the number of spikes m−2 depended mainly on the ability for tiller production, whereas in the irrigated experiments the final number of spikes was determined mostly by tiller survival.
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References
Bidinger, F.R., R.B. Musgrave & R.A. Fischer, 1977. Contribution of stored pre-anthesis assimilates to grain yield in wheat and barley. Nature 270: 431–433.
Blum, A., 1983. Genetic and physiological relationships in plant breeding for drought resistance. Agr Water Manage 7: 195–205.
Blum, A, B. Sinmena, J. Mayer, G. Golan & L. Shpiler, 1994. Stem reserve mobilisation supports wheat-grain filling under heat stress. Aust J Plant Physiol 21: 771–781.
Davidson, D.J. & P.M. Chevalier, 1990. Preanthesis tiller mortality in spring wheat. Crop Sci 30: 832–836.
Dofing, S.M. & C.W. Knight, 1992. Alternative model for path analysis of small-grain yield. Crop Sci 32: 487–489.
Edmeades, G.O., J. Bolanos, H.R. Lafitte, S. Rajaram, W. Pfeiffer & R.A. Fisher, 1989. Traditional approaches to breeding for drought resistance in cereals. In F.W.G. Baker (Ed.), Drought Resistance in Cereals, pp. 27–52. ICSU Press: C.A.B. International, Wallingford, UK.
Evans, L.T., 1993. Crop Evolution, Adaptation and Yield. Cambridge University Press: Cambridge.
García del Moral, L.F., J.M. Ramos, M.B. Garcia del Moral & P. Jimenez-Tejada, 1991. Ontogenetic approach to grain production in spring barley based on path-coefficient analysis. Crop Sci 31: 1179–1185.
García del Moral, M.B. & L.F. García del Moral, 1995. Tiller production and survival in relation to grain yield in winter and spring barley. Field Crops Res 44: 85–93.
García del Moral, L.F., D.J. Miralles & G.A. Slafer, 2002. Initiation and appearance of vegetative and reproductive structures throughout barley development. In: G.A. Slafer, J.L. Molina, R. Savin, J.L. Araus & I. Romagosa (Eds.), Barley Science: Recent Advances from Molecular Biology to Agronomy of Yield and Quality, pp. 243–268. Food Products Press, The Harworth Press., New York.
Gibson, L.R. & G.M. Paulsen, 1999. Yield components of wheat grown under high temperature stress during reproductive growth. Crop Sci 39: 1841–1846.
Giunta, F, R. Motzo & M. Deidda, 1993. Effect of drought on yield and yield components of durum wheat and triticale in a Mediterranean environment. Field Crops Res 33: 399–409.
Hamid, Z.A. & J.E. Grafius, 1978. Developmental allometry and its implication to grain yield in barley. Crop Sci 18: 83–86.
Housley, T.L. & H.W. Ohm, 1992. Earliness and duration of grain fill in winter wheat. Can J Plant Sci 72: 35–48.
Hunt, L.A., G. van der Poorten & S. Pararajasingham, 1991. Postanthesis temperature effects on duration and rate of grain filling in some winter and spring wheats. Can J Plant Sci 71: 609–617.
Landes, A. & J.R. Porter, 1989. Comparison of scales used for categorising the development of wheat, barley, rye and oats. Ann Appl Biol 115: 343–360.
Miralles, D.J. & G.A. Slafer, 1999. Wheat development. In E.H. Satorre & G.A. Slafer (Eds.), Wheat. Ecology and physiology of yield determination, pp. 13–43, Food Products Press, The Harworth Press, New York.
Miralles, D.J., R.A. Richards & G.A. Slafer, 2000. Duration of the stem elongation period influences the number of fertile florets in wheat and barley. Aust J Plant Physiol 27: 931–940.
Miralles, D.J., Y. Rharrabti, C. Royo, D. Villegas & L.F. García del Moral, 2002. Grain setting strategies of Mediterranean durum wheat cultivars released in different periods (1900–2000). In: Genotype-Phenotype: Narrowing the Gaps. AAB Conference, Cirencester, UK.
Mohamed, G.E.S. & C. Marshall, 1979. Physiological aspects of tiller removal on spring wheat. J Agric Sci 93: 457–463.
Royo, C., J. Voltas & I. Romagosa, 1999. Remobilization of pre-anthesis assimilates to the grain for grain only and dual-purpose (forage and grain) triticale. Agron J 91: 12–316.
SAS Institute Inc., 1997. SAS/STAT Software: Changes and Enhancements through Release 6.12. Cary, N.C.
Shpiler, L. & A. Blum, 1991. Heat tolerance to yield and its components in different wheat cultivars. Euphytica 51: 257–263.
Simane, B., P.C. Struik, M.M. Nachit & J.M. Peacock, 1993. Ontogenic analysis of field components and yield stability of durum wheat in water-limited environments. Euphytica 71: 211–219.
Simons, R. G., 1982. Tiller and ear production of winter wheat. Field Crop Abstract 35: 857–870.
Slafer, G.A. & H.M. Rawson, 1994. Sensitivity of wheat phasic development to major environmental factors: A re-examination of some assumptions made by physiologists and modellers. Aust J Plant Physiol 21: 393–426.
Slafer, G.A., D.F. Calderini & D.J. Miralles, 1996. Yield components and compensation in wheat: Opportunities for further increasing yield potential. In: M.P. Reynolds, S. Rajaram & A. McNab (Eds.), Increasing yield potential in wheat: Breaking the Barriers, pp. 101–133. CIMMYT, Mexico.
Willey, R.W. & R. Holliday, 1971. Plant population, shading and thining studies in wheat. J Agric Sci 77: 453–461.
Zadoks, J.C., T.T. Chang & C.F. Konzak, 1974. A decimal code for the growth stages of cereals. Weed Res 14: 415–421.
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del Moral, L.F.G., Rharrabti, Y., Elhani, S. et al. Yield Formation in Mediterranean durum wheats under two contrasting water regimes based on path-coefficient analysis. Euphytica 146, 203–212 (2005). https://doi.org/10.1007/s10681-005-9006-2
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DOI: https://doi.org/10.1007/s10681-005-9006-2