Water deficiency is a major constraint in wheat production and the most important contributor to yield reduction in the semiarid regions of the world. species related to wheat are valuable genetic sources for different traits including resistance/tolerance to biotic and abiotic stresses. To locate the genes controlling the physiological and agronomic criteria of drought tolerance, disomic addition lines of secale cereale cv. Imperial (donor) into the genetic background of Triticum aestivum cv. Chinese Spring (recipient) were tested under field, greenhouse and laboratory conditions. Disomic addition lines exhibited significant differences for relative water content (RWC), relative water loss (RWL), water use efficiency (WUE) and stomatal resistance (SR), indicating the presence of genetic variation and the possibility of selection for improving drought tolerance. Three physiological variables, RWL, WUE and SR, with high correlation with the stress tolerance index (STI) and germination stress index (GSI), contributed 69.7% to the variability of yield under stress (Ys) in the regression equation. Based on the physiological multiple selection index (MSI) most of the QTLs controlling physiological indices of drought tolerance were located on chromosomes 3R, 5R and 7R. The contribution of addition line 7R to the MSI was 47%. The evaluation of disomic addition lines for STI and GSI revealed that most of the QTLs involved in these quantitative criteria of drought tolerance are located on 3R and 7R. Cluster analysis and three dimensional plots of Ys, yield potential (Yp) and MSI indicated that 3R and 7R are the most important chromosomes carrying useful genes for improving drought tolerance.
Friebe, B., Hammer, E. D., Gill, B. S. (1996): Standard karyo types of Aegilops uniaristata, Ae. mutica, Ae. comosa ssp. comosa and heldrechii. Pl. Sys. Evol., 202, 199-210.
'Standard karyo types of Aegilops uniaristata, Ae. mutica, Ae. comosa ssp. comosa and ' () 202 heldrechii. Pl. Sys. Evol. : 199 -210 .
Gale, M. D., Miller, T. E. (1987): The introduction of alien genetic variation into wheat. pp. 173-210. In: Lupton, F. G. H. (ed.), Wheat Breeding, Its Scientific Basis. Chapman and Hall, UK.
The introduction of alien genetic variation into wheat. , () 173 -210 .
Genty, B., Briantais, Y. M., Baker, N. R. (1989): The relationship between the quantum yield of photosynthetic electron transport and quenching of chlorophyll fluorescence. Biochem. Biophys. Acta, 990, 87-92.
'The relationship between the quantum yield of photosynthetic electron transport and quenching of chlorophyll fluorescence ' () 990 Biochem. Biophys. Acta : 87 -92 .
Islam, A. K., Shepherd, K. W. (1991): Alien genetic variation in wheat improvement. pp. 291-312. In: Gupta, P. K., Tsachiya(eds.), Chromosome Engineering in Plants, Part A. Elsevier. Amsterdam.
Alien genetic variation in wheat improvement. , () 291 -312 .
Andrew, K. B., Hammer, G. L., Henzell, R. G. (2000): Does maintaining green leaf area in sorghum improve yield under drought? II. Dry matter production and yield. Crop Sci., 40, 1037-1048.
'Does maintaining green leaf area in sorghum improve yield under drought? II. Dry matter production and yield ' () 40 Crop Sci. : 1037 -1048 .
Blum, A. (1983): Evidence for genetic variability in drought resistance and its implication for plant breeding. In: Drought Resistance in Crops, with Emphasis on Rice. IRRI, Los Banos, Philippines. pp. 53-68.
Blum, A. (1988): Drought resistance. pp. 43-69. In: Blum, A. (ed.), Plant Breeding for Stress Environments. CRC, Florida.
Drought resistance. , () 43 -69 .
Bouslama, M., Schapaugh, W. T. (1984): Stress tolerance in soybeans. Evaluation of three screening techniques for heat and drought tolerance. Crop Sci., 24, 933-937.
'Stress tolerance in soybeans. Evaluation of three screening techniques for heat and drought tolerance ' () 24 Crop Sci. : 933 -937 .
Dedio, W. (1975): Water relations in wheat leaves as screening tests for drought resistance. Can. J. Plant Sci., 55, 369-378.
'Water relations in wheat leaves as screening tests for drought resistance ' () 55 Can. J. Plant Sci. : 369 -378 .
Ehdaie, B., Hall, A. E., Farquhar, G. D., Nguyen, H. T., Waines, J. G. (1991): Water use efficiency and carbon isotope discrimination in wheat. Crop Sci., 31, 1282-1288.
'Water use efficiency and carbon isotope discrimination in wheat ' () 31 Crop Sci. : 1282 -1288 .
Ehdaie, B., Waines, J. G. (1993): Variation in water-use efficiency and its components in wheat. I. Well-watered pot experiment. Crop Sci., 33, 294-299.
'Variation in water-use efficiency and its components in wheat. I. Well-watered pot experiment ' () 33 Crop Sci. : 294 -299 .
Eskridge, K. M., Shah, M. M., Baenziger, P. S., Travnicek, D. A. (2000): Correcting for classification errors when estimating the number of genes using recombinant inbred chromosome lines. Crop Sci., 40, 398-403.
'Correcting for classification errors when estimating the number of genes using recombinant inbred chromosome lines ' () 40 Crop Sci. : 398 -403 .
Farshadfar, E. (1995): Genetic control of drought tolerance in wheat. Ph.D. Thesis. Hungarian Academy of Sciences, Budapest.
Farshadfar, E. (1998): Methods of genetic analysis of drought tolerance in plant breeding. Proc. 4th Iranian Congress of Crop Production and Plant Breeding. Industrial University of Isfahan, Iran.
Fernandez, G. C. J. (1992): Effective selection criteria for assessing plant stress tolerance. In: Proceeding of a Symposium, Taiwan, 13-18 Aug. Chapter 25. pp. 257-270.
Loss, S. P., Siddique, K. H. M. (1994): Morphological and physiological traits associated with wheat yield increases in Mediterranean environments. Adv. in Agron., 52, 229-276.
'Morphological and physiological traits associated with wheat yield increases in Mediterranean environments ' () 52 Adv. in Agron. : 229 -276 .
Morgan, J. M. (1989): Physiological traits for drought resistance. pp. 53-64. In: Baker, F. W. G. (ed.), Drought Resistance in Cereals. C. A. B. International.
Physiological traits for drought resistance. , () 53 -64 .
Morgan, M. (1991): A gene controlling difference in osmoregulation in wheat. Aus. J. Plant Physiol., 18, 249-257.
'A gene controlling difference in osmoregulation in wheat ' () 18 Aus. J. Plant Physiol. : 249 -257 .
Passioura, J. B. (1983): Roots and drought resistance. Agric. Water Manage., 7, 265-280.
'Roots and drought resistance ' () 7 Agric. Water Manage. : 265 -280 .
Sapara, V. T., Sarage, E., Anaele, A. O., Beyl, C. A. (1991): Varietal differences of wheat and triticale to water stress. J. Agron. Crop Sci., 167, 23-28.
'Varietal differences of wheat and triticale to water stress ' () 167 J. Agron. Crop Sci. : 23 -28 .
Schonfeld, M. A., Johnson, R. C., Carver, B. F., Mornhinweg, D.W. (1988): Water relations in winter wheat as drought resistance indicators. Crop Sci., 28, 526-531.
'Water relations in winter wheat as drought resistance indicators ' () 28 Crop Sci. : 526 -531 .
Jiang, J., Friebe, B., Gill, B. S. (1994): Recent advances in alien gene transfer in wheat. Euphytica., 73, 199-212.
'Recent advances in alien gene transfer in wheat ' () 73 Euphytica. : 199 -212 .
Khush, G. S. (1973): Cytogenetics of Aneuploids. Academic Press, New York.
Cytogenetics of Aneuploids , ().
Knott, D. R. (1987): Transferring alien genes to wheat. pp. 462-471. In: Heyne, E. G. (ed.), Wheat and Wheat Improvement (2nd ed.).
Kristin, A. S., Brothers, M. E., Kelly, I. D. (1997): Marker-assisted selection to improve drought resistance in common bean. Crop Sci., 37, 51-60.
'Marker-assisted selection to improve drought resistance in common bean ' () 37 Crop Sci. : 51 -60 .
Sharma, H. C., Gill, B. C. (1984): Current status of wide hybridization in wheat. Euphytica, 32, 17-31.
'Current status of wide hybridization in wheat ' () 32 Euphytica : 17 -31 .
Singh, D. P. (1989): Evaluation of specific dehydration tolerance traits for improvement of drought resistance. pp. 165-175. In: Baker, F. W. G. (ed.), Drought Resistance in Cereals. C. A. B. International.
Evaluation of specific dehydration tolerance traits for improvement of drought resistance. , () 165 -175 .
Sojka, R. E., Stolzy, L. H., Fischer, R. A. (1981): Seasonal drought response of selected wheat cultivars. Agron. J., 73, 838-845.
'Seasonal drought response of selected wheat cultivars ' () 73 Agron. J. : 838 -845 .
Yang, R. C., Jana, S., Clarke, J. M. (1991): Phenotypic diversity and associations of some potentially drought-responsive characters in durum wheat. Crop Sci., 31, 1484-1491.
'Phenotypic diversity and associations of some potentially drought-responsive characters in durum wheat ' () 31 Crop Sci. : 1484 -1491 .
Al-Dakheel, R. J. (1991): Osmotic adjustment, A selection criterion for drought tolerance. pp. 337-368. In: Acevedo, E., Conesa, A. P., Monneveux, P., Srivastava, J. P. A.(eds.), Physiology-Breeding in Winter Cereals for Stressed Mediterranean Environments. Montpellier, France.
Osmotic adjustment, A selection criterion for drought tolerance. , () 337 -368 .
Alidib, T., Monneveux, P., Araus, J. (1990): Breeding durum wheat for drought tolerance. Analytical, synthetical approaches and their connection. Proceeding of International Symposium, June 4th-8th, Agricultural Academy,Albena, Bulgaria, pp. 224-240.