Wheat production in stressed environments

Strong early vigour plays a crucial role in wheat yield improvement by enhancing resource utilization efficiency Synthetic hexaploid wheat (SHW) combines the elite genes of tetraploid wheat with Aegilops tauschii and has been widely used in wheat genetic improvement for its abundant genetic variation The two SHWs Syn79 and Syn80 were derived from the crossing of the same tetraploid wheat DOY1 with two different Ae tauschii accessions, AT333 and AT428, respectively The Syn80 possessed better early vigour traits than Syn79, theretically caused by their D genome from Ae tauschii To dissect their genetic basis in a hexaploid background, 203 recombinant inbred lines (RILs) derived from the cross of Syn79 x Syn80 were developed to detect quantitative trait loci (QTL) for four early biomass related traits: plant height (PH), tiller number (TN), shoot fresh weight (SFW) and shoot dry weight (SDW) per plant, under five different environmental conditions Determined from the data of SNP markers, two genome regions on 1DS and 7D were stably associated with the four early biomass related traits showing pleiotropic effects Four stable QTLs QPhsaas-1DS, QTnsaas-1DS, QSfwsaas-1DS and QSdwsaas-1DS explaining 792, 1534, 964 and 1015% of the phenotypic variation, respectively, were clustered in the region of 1DS from AX-94812958 to AX-110910133 Meanwhile, QPhsaas-7D, QTnsaas-7D, QSfwsaas-7D and QSdwsaas-7D were flanked by AX-109917900 and AX-110605376 on 7D, explaining 1612, 2435, 1525 and 1337% of the phenotypic variation on average, respectively Moreover, these genomic QTLs on 1DS and 7D enhancing biomass in the parent Syn80 were from Ae tauschii AT428 These findings suggest that these two QTLs from Ae tauschii can be expressed stably in a hexaploid background at the jointing stage and be used for wheat improvement

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Mapping QTLs for enhancing early biomass derived from Aegilops tauschii in synthetic hexaploid wheat.

Plant Breeding Under a Changing Climate

M. VAN GINKEL1 2 ∗, F. OGBONNAYA1 2, M. IMTIAZ1 2, C. RAMAGE1 2, M.G. BORGOGNONE1, F. DRECCER1 4, J. EDER1, M. EMMERLING1 2, P. HEARNDEN2 3, E. LAGUDAH6, A. PELLEGRINESCHI2 5, R. TRETHOWAN5, J. WILSON1 2 AND G. SPANGENBERG1 2 1 Primary Industries Research Victoria, Department of Primary Industries, Victoria, Australia 2 Molecular Plant Breeding Cooperative Research Centre, Victoria, Australia 3 School of Agriculture and Wine, South Australia, Australia 4 Present address: CSIRO Plant Industry, Queensland, Australia 5 International Maize and Wheat Improvement Centre (CIMMYT), Mexico DF, Mexico 6 CSIRO Plant Industry, Australian Capital Territory, Australia ∗ E-mail: maarten.vanginkel@dpi.vic.gov.au

Molecular Breeding for Salt Tolerance, Pre-Harvest Sprouting Resistance and Disease Resistance Using Synthetic Hexaploid Wheats, Genetic Transformation, and Associated Molecular Markers

C. Ramage

Papers

Molecular Breeding for Salt Tolerance, Pre-Harvest Sprouting Resistance and Disease Resistance Using Synthetic Hexaploid Wheats, Genetic Transformation, and Associated Molecular Markers