Abstract
The B(S) genome diploids (2n = 2x = 14) are a unique reservoir of genetic diversity that can provide wheat breeders a rich source of allelic variation for stress traits that limit productivity. Restricted in practical use essentially due to their complex chromosomal behavior, these diploids have been in limited practical usage. The classic utilization example has been the suppression activity of the Ph locus and role in alien genetic transfer aspects that has been a standard in cytogenetic manipulation studies. For applied efforts focusing on Aegilops speltoides researchers in CIMMYT initiated an ambitious program to make AABBBB(SS) synthetics and made progress by generating over 50 such synthetics. Of these 20 were available for this study in which phenology and powdery mildew screening were evaluated. Four of these 20 synthetics appeared to be useful sources for further exploitation in breeding. These were entries 6, 9, 10 and 11 suited for exploitation in pre-breeding, with positive phenological characters particularly high thousand-kernel weight and are cytologically near euploid at 2n = 6x = 42. The subtle hyper (43) and hypoploid number would not negate their applied use potential. Preference however goes to genotypes 9 and 11.
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Alonso, L.C., Kimber, G. 1984. The analysis of meiosis in hybrids. Can. J. Genet. Cytol. 23:221–234.
Brocklehurst, P.A. 1977. Factors controlling grain weight in wheat. Nature 266:348–349.
Calderini, D.F., Ortiz-Monasterio, I. 2003. Crop physiology and metabolism: Grain position affects grain macronutrient and micronutrient concentrations in wheat. Crop Sci. 43:141–151.
Campbell, K.J., Bergman, C.J., Gualberto, D.G., Anderson, J.A., Giroux, M.J., Hareland, G., Fulcher, R.G., Sorrells, M.E., Finney, P.L. 1999. Quantitative trait loci associated with kernel traits in a soft × hard wheat cross. Crop Sci. 39:1184–1195.
Chen, P.D., Tsujimoto, H., Gill, B.S. 1994. Transfer of PhI gene promoting homoeologous pairing from Aegilops speltoides into common wheat and their utilization in alien genetic introgression. Theor. Appl. Genet. 88:97–101.
Dreccer, F.M., Borgognone, G.M., Ogbonnaya, F.C., Trethowan, R.M., Winter, B. 2007. CIMMYT-selected derived synthetic bread wheats for rainfed environments: yield evaluation in Mexico and Australia. Field Crops Res. 100:218–228.
Dweikat, I., Ohm, H., Mackenzie, S., Patterson, F., Cambron, S., Ratcliffe, R. 1994. Association of a DNA marker with Hessian fly resistance gene H9 in wheat. Theor. Appl. Genet. 89:964–968.
Faris, J.D., Xu, S.S., Cai, X., Friesen, T.L., Jin, Y. 2008. Molecular and cytogenetic characterization of a durum wheat-Aegilops speltoides chromosome translocation conferring resistance to stem rust. Chromosome Res. 16:1097–1105.
Gill, B.S., Raupp, W.J. 1987. Direct genetic transfer from Aegilops squarrosa L. to hexaploid wheat. Crop Sci. 27:445–450.
Kihara, H. 1944. Discovery of the DD-analyser, one of the ancestors of vulgare wheats. Agric. Hortic. 19:889–890.
Mago, R., Zhang, P., Bariana, H.S., Verlin, D.C., Bansal, U.K.et al. 2009. Development of wheat lines carrying stem rust resistance gene Sr39 with reduced Aegilops speltoides chromatin and simple PCR markers for marker-assisted selection. Theor. Appl. Genet. 119:1441–1450.
McFadden, E.S., Sears, E.R. 1946. The origin of Triticum spelta and its free-threshing relatives. J. Hered. 37:107–116.
Metakovsky, E.V., Novoselskaya, A.Y., Kopus, M.M., Sobko, T.A., Sozinov, A.A. 1984. Blocks of gliadin components in winter wheat detected by one-dimensional polyacrylamide gel electrophoresis. Theor. Appl. Genet. 67:559–568.
Mujeeb-Kazi, A. 2006. Utilization of Genetic Resources for Bread Wheat Improvement. In: Singh, R.J., Jauhar, P.P. (eds), Genetic Resources, Chromosome Engineering, and Crop Improvement: Cereals. Vol. 2. CRC Press, New York, USA, pp. 61–97.
Mujeeb-Kazi, A., Asiedu, R. 1995. The potential of wide hybridization in wheat improvement. Ann. Biol. 11:1–15.
Mujeeb-Kazi, A., Hettel, G.P. (eds). 1995. Utilizing Wild Grass Biodiversity in Wheat Improvement: 15 years of Wild Cross Research at CIMMYT. CIMMYT Research Report No. 2. Mexico, D.F., Mexico.
Mujeeb-Kazi, A., Rosas, V., Roldan, S. 1996. Conservation of genetic variation of Triticum tauschii (Coss.) Schmalh (Aegilops squarossa auct. Non L.) in synthetic hexaploid wheats (T. turgidum L. s. lat. × T. tauschii; 2n = 6x = 42; AABBDD) and its potential utilization for wheat improvement. Genet Resour. Crop Evol. 43:129–134.
Nei, M., Li, W.H. 1979. Mathematical model for studying genetic variation in terms of restriction endonucleases. Proc. Natl Acad. Sci. 76:5269–5273.
Ogbonnaya, F., Mujeeb-Kazi, A., Kazi, A.G., Lagudah, E.L., Xu, S.S., Bonnett, D. 2013. Synthetic hexaploid in wheat improvement. In: Janick, J. (ed.), Plant Breeding Reviews. Vol. 37. First edition. John Wiley & Sons Inc., New York, USA, ISSN: 0730-2207, pp. 35–122.
Röder, M.S., Korzun, V., Wendehake, K., Plaschke, J., Tixier, M.H., Leroy, P., Ganal, M.W. 1998. A microsatellite map of wheat. Genetics 149:2007–2023.
Röder, M.S., Huang, X.Q., Börner, A. 2008. Fine mapping of the region on wheat chromosome 7D controlling grain weight. Funct. Integr. Genomics 8:79–86.
Rohlf, E.J. 1993. NTSYS-pc: Numerical taxonomy and multivariate analysis system, version 1.80. Applied Biostatistics Inc., Setauket, New York, USA.
Sneath, P.H.A., Sokal, R.R. 1973. Numerical Taxonomy. W.H. Freeman and Company. San Francisco, USA, pp. 230–234.
Trethowan, R.M., Mujeeb-Kazi, A. 2008. The use of novel germplasm resources to improve the environmental stress tolerance of hexaploid wheat. Crop Sci. 48:1255–1265.
Weining, B., Langridge, P. 1991. Identification and mapping polymorphism in cereals based on PCR. Theor. Appl. Genet. 82:209–216.
Zhixia, N., Klindword, D.L., Friesen, T.L., Chao, S., Jin, Y., Cai, X., Xu, S.S. 2011. Targeted introgression of a wheat stem rust resistance gene by DNAmarker-assisted chromosome engineering. Genetics 187:1011–1021.
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Communicated by M. Molnár-Láng
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Gul Kazi, A., Rasheed, A., Bux, H. et al. Cytological, Phenological and Molecular Characterization of B (S)-Genome Synthetic Hexaploids (2n = 6x = 42; AABBSS). CEREAL RESEARCH COMMUNICATIONS 43, 179–188 (2015). https://doi.org/10.1556/CRC.2014.0043
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DOI: https://doi.org/10.1556/CRC.2014.0043