Gene effects were analyzed using mean excised-leaf water loss and relative water content of 12 populations viz., both parents (P1 and P2), F1, F2, first back cross generations (BC1 and BC2), second back cross generations (B11, B12, B21, B22) and back cross-selfed generations (B1 s and B2s) of four crosses involving three drought tolerant and three drought susceptible cultivars of Triticum aestivum L. to determine nature of gene action governing excised-leaf water loss (ELWL) and relative water content (RWC) through generation mean analysis under rainfed (E1) and irrigated (E2) environments. Both additive-dominance and digenic epistatic model were found to be inadequate in all the crosses for ELWL and in most of the crosses for RWC to explain genetic variation among the generation means. Additive gene effects were predominant for RWC, while for ELWL both additive and dominance component of variance were important. Epistatic effects, particularly dominance × dominance (1) type of interaction was more predominant for RWC, while additive × additive(i) for ELWL. Duplicate type of epistasis was observed in the crosses Hindi 62/HS240 and VL421/HS240 for RWC and in the cross S4/HPW89 for ELWL under both the environments. Complementary type of epistasis was observed only in the cross VL421/PBW175 for ELWL under E1. Hybridization systems, such as biparental mating and/or diallel selective mating could be useful for improvement of these traits which would help in isolating drought tolerant progenies.
Baker, F.H.G. 1989. Drought Resistance in Cereals. CAB International.
Barrs, H.D. 1968. Determination of water deficit in plant tissues. In: Kozlouski, T.T. (ed.), Water Deficits and Plant Growth. Vol. I. Academic Press, New Delhi, pp. 235–268.
Carter, Jr., T.E., Patterson, R.P. 1985. Use of relative water content as a selection tool for drought tolerance in soybean. Fide Agron abstr 77th Annu Meeting, p. 77.
Cavalli, L.L. 1952. Analysis of linkage in quantitative inheritance. In: Rieve, E.C.R., Waddington, C.H. (eds), Quantitative Inheritance. HMSO, London, pp. 135–144.
Clarke, J.M. 1987. Use of physiological and morphological traits in breeding programmes to improve drought resistance of cereals. In: Srivastava, J.P., Proceddu, R., Acevedo, E., Sharma, S. (eds), Drought Tolerance in Winter Wheat Cereals. John Wiley and Sons, Chichester, pp. 171–190.
Clarke, J.M., Romagosa, I., Jana, S., Srivastava, J.P., McCaig, T.N. 1989. Relationship of excised-leaf water loss rate and yield of durum wheat in diverse environments. Can. J. Plant Sci. 69:1075–1081.
Clarke, T.M., Townley-Smith, T.F. 1986. Heritability and relationship of excised-leaf water retention in durum wheat. Crop Sci. 26:289–292.
Dhanda, S.S., Sethi, G.S. 1998. Inheritance of excised leaf water loss and relative water content in bread what (Triticum aestivum). Euphytica 104:39–47.
Farshadfar, E., Farshadfar, M., Sutka, J. 2000. Combining ability analysis of drought tolerance in wheat over different water regimes. Acta Agron. Hung. 48:353–361.
Hayman, B.I., Mather, K. 1955. The description of genetic interaction in continuous variation. Biometrics 11:69–81.
Hill, J. 1966. Recurrent back crossing in the study of quantitative inheritance. Heredity 21:85–120.
Islam, M.S., Srivastava, P.S.L., Deshmukh, P.S. 1999. Genetic studies on drought tolerance in wheat II. Early seedling growth and vigour. Ann. Agric. Res. 20:190–194.
Mather, K. 1949. Biometrical Genetics. 1st Ed. Methuen, London.
McCaig, T.N., Romagosa, I. 1991. Water status measurements of excised leaves: Position and age effects. Crop Sci. 31:1583–1588.
Morris, M.L., Belaid, A., Byerlac, D. 1991. Wheat and Barley production in rainfed marginal environments of the developing world. Part 1 of 1990–91 CIMMYT World Wheat Factors and Trends. Wheat and Barley Production in Rainfed Marginal Environments of the Developing World. CIMMYT, Mexico, D.F.
Sinclair, T.R., Ludlow, M.M. 1985. Who taught plants thermodynamics? Then unfulfilled potential of plant water potential. Aust. J. Plant Physiol. 12:213–217.
Singh, G., Bhullar, G.S., Gill, K.S. 1988. Inheritance of yield and its components in an inter varietal cross of bread wheat. Crop Improv. 15:200–202.
Snedecor, G.W., Cochram, W.G. 1968. Statistical Methods. The Iowa State Univ. Press, Amer. U.S.A.
Winter, S.R., Music, T.S., Porter, K.B. 1988. Evaluation of screening techniques for breeding drought resistant winter wheat. Crop Sci. 28:512–516.
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Kumar, A., Sharma, S.C. Genetics of Excised-Leaf Water Loss and Relative Water Content in Bread Wheat (Triticum aestivum L.). CEREAL RESEARCH COMMUNICATIONS 35, 43–52 (2007). https://doi.org/10.1556/CRC.35.2007.1.6
- drought tolerant
- duplicate epistasis
- gene effects
- Triticum aestivum L.
- non-allelic interactions