Quantitative Trait Loci for Seed Dormancy in Wild Barley (Hordeum spontaneum C. Koch)
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A quantitative trait locus analysis was carried out to unravel the genetic basis of dormancy in wild barley (Hordeum spontaneum) from Israel. Two accessions, Ashkelon and Mehola, from divergent environments were crossed to produce a mapping population. A linkage map was produced from the F2 population, and F4 seeds were used for germination experiments. Five quantitative trait loci (QTL) were detected for dormancy across the different germination experiments. These QTL were found on chromosomes 1, 2, 5, 6 and 7. The variation explained by each QTL varied between 8 and 25%. Ashkelon alleles increased the germination except for the QTL on chromosome 5. Three out of these five QTL co-locate with QTL found earlier in cultivated barley crosses, although this does not necessarily imply that they would be the same loci. The level of dormancy is much higher in wild barley than in cultivated barley and wild barley may have alleles that have not yet been utilised in breeding for optimally dormant barley.
Key wordsDormancy Germination Hordeum spontaneum QTL Wild barley
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- Bewley J.D. and Black M. 1994. Seeds: Physiology of Development and Germination. Plenum Press.Google Scholar
- Gutterman, Y., Nevo, E. 1994Temperatures and ecological genetic differentiation affecting the germination of Hordeum spontaneum caryopses harvested from 3 populations – the Negev Desert and opposing slopes on Mediterranean Mount CarmelIsrael J. Plant Sci.42183195Google Scholar
- Oberthur L., Dyer W., Ullrich S.E. and Blake T.K. 1995. Genetic analysis of seed dormancy in barley (Hordeum vulgare L.). J. Quant. Trait Loci. available at http://www.cabi- publishing.org/gateways/jag/papers95/paper595/dormancy. html.Google Scholar
- Ogawara, K., Hayashi, J. 1964Dormancy studies in Hordeum spontaneum seedsBerichte des Ohara Instituts für landwirtschaftliche BiologieOkayama Universita¨t12159188Google Scholar
- Poorter H., van Rijn C.P.E., Vanhala T.K., Verhoeven K.J.F., de Jong Y.E.M., Stam P. and Lambers H. 2004. A genetic analysis of relative growth rate and underlying components in Hordeum spontaneum. Oecologia in press. Article available at Online First, 20 November 2004, DOI: 10.1007/s00442-004-1705-1.Google Scholar
- Schuurink, R.C., Van Beckum, J.M.M., Heidekamp, F. 1992Modulation of grain dormancy in barley by variation of plant-growth conditionsHereditas117137143Google Scholar
- Ullrich, S.E., Hayes, P.M., Dyer, W.E., Blake, T.K., Clancy, J.A. 1992Quantitative trait locus analysis of seed dormancy in ‘Steptoe’ barleyWalker-Simmons, M.K.Ried, J.L. eds. Preharvest Sprouting in Cereals 1992American Association of Cereal ChemistrySt Paul, MN136145Google Scholar
- Van Ooijen J.W. and Maliepaard C. 1996. MapQTLTM version 4.0: Software for the calculation of QTL positions on genetic maps. CPRO-DLO, Wageningen, http://www.kyazma.nl.Google Scholar
- Verhoeven, K. 2003A genetic analysis of selection and adaptation in wild barleyPonsen and Looijen B.VWageningenDissertationGoogle Scholar
- Wang, M. 1997The role of abscisic acid in the regulation of barley grain germinationSeed Sci. Technol.256774Google Scholar