000			02981nab a22003977a 4500
001			G90424
003			MX-TxCIM
005			20230904183317.0
008			210618s2008 at |||p|op||| 00| 0 eng d
022			_a0004-9409
024	8		_ahttps://doi.org/10.1071/AR07225
040			_aMX-TxCIM
041			_aeng
090			_aCIS-5281
100	1		_9851 _aDreisigacker, S. _gGlobal Wheat Program _8INT2692
245	1	0	_aUse of synthetic hexaploid wheat to increase diversity for CIMMYT bread wheat improvement
260			_aVictoria (Australia) : _bCSIRO Publishing, _c2008.
340			_aComputer File|Printed
500			_aPeer review
520			_aTo date, the International Maize and Wheat Improvement Center (CIMMYT) has produced more than 1000 synthetic hexaploid wheats (SHWs), using diverse accessions of the D genome donor species (Aegilops tauschii). Many of these SHWs produced from many different Ae. tauschii have shown resistance or tolerance to various biotic and abiotic stresses, indicating the potential importance of the Ae. tauschii gene pool for breeding purposes. SHWs were backcrossed to CIMMYT improved germplasm to produce synthetic backcross-derived lines (SBLs), which are agronomically similar to the improved parents, but retain the introgressed traits of interest under selection and thereby new diversity. Molecular studies show that SHWs and SBLs are genetically diverse at the DNA level when compared with traditional bread wheat cultivars and preferential transmission of some alleles from the SHW parent has been seen in all genomes, indicating positive selection. Marker analyses of wheat cultivars released over time indicate that SBLs are ideal materials to simultaneously increase yield and diversity for other traits. Following successful diversification of the wheat D genome, CIMMYT has shifted to target improvement of hexaploid wheat via the A and B genomes, focusing on specific traits. Screening the CIMMYT germplasm collection of T. turgidum subsp. dicoccum for Russian wheat aphid resistance and drought tolerance revealed varying levels of phenotypic expression. Promising accessions will be used for the production of new SHWs for future introgressions into elite bread wheat backgrounds.
536			_aGlobal Wheat Program
546			_aText in English
591			_aCSIRO
594			_aINT2692
650		7	_aWheat _2AGROVOC _91310
650		7	_aHexaploidy _2AGROVOC _92020
650		7	_aPlant biotechnology _2AGROVOC _98056
650		7	_aGenetic variation _2AGROVOC _91129
650		7	_aCross-breeding _2AGROVOC _926603
700	1		_9849 _aKishii, M. _gGlobal Wheat Program _8INT2678
700	1		_920327 _aLage, J.
700	1		_94138 _aWarburton, M.L.
773	0		_tAustralian Journal of Agricultural Research _n635179 _gv. 59, no. 5, p. 413-420 _dVictoria (Australia) : CSIRO Publishing, 2008. _wG444170 _x0004-9409
856	4		_yAccess only for CIMMYT Staff _uhttps://hdl.handle.net/20.500.12665/746
942			_cJA _2ddc _n0
999			_c26989 _d26989