marker-assisted selection in wheat - ictsd

Chapter 6 – Targeted introgression of cotton fibre quality quantitative trait loci using molecular markers 79effect of a single given QTL on the phenotypicvalue of a plant harbouring it, butalso in case the introgressed QTL is provento contribute significantly to the improvementof a given trait (Bernacchi et al., 1998).Also, QTL-NILs could be used as donormaterial for QTL pyramiding (Pelemanand van der Voort, 2003). Finally, an introgressionlibrary, i.e. a collection of NILs,will typically serve as primary plant materialfor QTL fine mapping and eventualQTL cloning (Salvi and Tuberosa, 2005).However successful marker-aided introgressionof genomic regions of interestmay be, only phenotypic analysis of plantmaterial stemming from the MAS process,including the assessment of its adaptabilityto any given set of local agronomic and ecologicalconditions, will allow validation ofthis procedure.ReferencesBasten, C., Weir, B. & Beng, Z-B. 1999. QTL cartographer, version 1.13. Dept. of Statistics, NorthCarolina State Univ., Raleigh, NC, USA.Bernacchi, D., Beck-Bunn, T., Emmatty, D., Eshed, Y., Inai, S., Petiard, V., Sayama, H., Uhlig, J.,Zamir, D. & Tanksley, S.D. 1998. Advanced backcross QTL analysis in tomato. II. Evaluation ofnear isogenic lines carrying single-donor introgressions for desirable wild QTL-alleles derives fromLycopersicon hirsutum and L. pimpinellifolium. Theor. Appl. Genet. 97: 170–180.Brubaker, C.L. & Wendel, J.F. 2001. RFLP diversity in cotton. In J.N. Jenkins & S. Saha, eds. Geneticimprovement of cotton, emerging technologies, pp 81-101. Enfield, NH, USA, Science Publisher Inc.Dekkers, J.C.M. & Hospital, F. 2002. The use of molecular genetics in the improvement of agriculturalpopulations. Nature Genet. 3: 22–32.Jiang, C., Chee, P., Draye, X., Morrell, P., Smith, C.W. & Paterson, A.H. 2000. Multilocus interactionsrestrict gene introgression in interspecific populations of polyploid Gossypium (cotton).Evolution 54: 798–814.Jiang, C., Wright, R., El-Zik, K.M. & Paterson, A.H. 1998. Polyploid formation created uniquevenues for response to selection in Gossypium (cotton). Proc. Nat. Acad. Sc. USA 95: 4419–4424.Kohel, R.J., Yu, J., Park, Y.-H. & Lazo, G. 2001. Molecular mapping and characterization of traitscontrolling fiber quality in cotton. Euphytica 121: 163–172Lacape, J.-M., Nguyen, T.-B., Thibivilliers, S., Courtois, B., Bojinov, B.M., Cantrell, R.G., Burr, B.& Hau, B. 2003. A combined RFLP-SSR-AFLP map of tetraploid cotton based on a Gossypiumhirsutum x Gossypium barbadense backcross population. Genome 46: 612–626.Lacape, J.-M., Nguyen, T.-B., Courtois, B., Belot, J.-L., Giband, M., Gourlot, J.-P., Gawryziak, G.,Roques, S. & Hau, B. 2005. QTL analysis of cotton fiber quality using multiple G. hirsutum x G.barbadense backcross generations. Crop Sci. 45: 123–140.Lander, E., Green, P., Abrahamson, J., Barlow, A., Daly, M.J., Lincoln, S. & Newburg, L. 1987.MapMaker: an interactive computer package for constructing primary linkage maps of experimentaland natural populations. Genomics 1:174–181.Mei, M., Syed, N.H., Gao, W., Thaxton, P.M., Smith, C.W., Stelly, D.M. & Chen, Z.J. 2004. Geneticmapping and QTL analysis of fiber-related traits in cotton (Gossypium). Theor. Appl. Genet. 108:280–291.Nguyen, T.-B., Giband, M., Brottier, P., Risterucci, A.-M. & Lacape, J.-M. 2004. Wide coverage oftetraploid cotton genome using newly developed microsatellite markers. Theor. Appl. Genet. 109:167–175.