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001			G74255
003			MX-TxCIM
005			20240919021055.0
008			121211s ||||f| 0 p|p||0|| |
020			_a970-648-052-8
040			_aMX-TxCIM
072		0	_aF30
072		0	_aH50
082	0	4	_a631.53 _bRIB
100	1		_aGebisa Ejeta _uMolecular Approaches for the Genetic Improvement of Cereals for Stable Production in Water-Limited Environments. A Strategic Planning Workshop; El Batan, Texcoco (Mexico); 21-25 Jun 1999
110	2		_aCentro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico)
245	0	0	_aGenetic analysis of pre-flowering and post-flowering drought tolerance in sorghum
260			_aMexico, DF (Mexico) _bCIMMYT : _c2000
340			_aPrinted
520			_aDrought tolerance is an important agronomic trait in field crops, but the genetic and physiological mechanisms that condition its expression are not well understood. Sorghum (Sorghum bicolor (L.) Moench) is one of the more drought tolerant crops and is an excellent model for studying mechanisms of drought tolerance in higher plants. The purpose of the studies presented in this report was to use molecular markers to identify genetic loci associated with the expression of pre-flowering and post-flowering drought tolerance in sorghum. A recombinant inbred line population of 100 lines was developed from a cross between two parents with contrasting drought tolerance, TX7078 (pre-flowering tolerant, post-flowering susceptible) and B35 (post-flowering tolerant, pre-flowering susceptible). The RI lines were agronomically evaluated under conditions of pre-flowering drought, post-flowering drought, and under full irrigation. The population was also genotyped with 170 molecular markers using standard protocols. Analysis of genotypic and phenotypic data led to identification of regions of the genome associated with specific drought tolerance reactions. We identified quantitative trait loci (QTLs) for yield stability, yield under drought, stay-green, and other traits associated with drought tolerance. We developed and characterized near isogenic lines with contrasting alleles for markers linked to individual QTL and verified the marker-phenotype association observed in the RI lines. We conclude that our approach of narrowing on specific genomic regions associated with drought tolerance, coupled with physiologic characterization, holds promise for developing a better understanding of this complex trait.
546			_aEnglish
591			_a0101|AL-ABC Program|AGRIS 0101
593			_aJose Juan Caballero
595			_aCPC
650	1	7	_aCereals _gAGROVOC _2 _91036
650	1	0	_aDrought resistance
650	1	0	_91081 _aDrought stress _gAGROVOC
650	1	0	_aGenetic control _91694
650	1	7	_aGermplasm _gAGROVOC _2 _91136
650	1	0	_aResearch projects _91237
650	1	0	_aSorghum _gAGROVOC _92002
653	0		_aCIMMYT
650	1	0	_91313 _aYields _gAGROVOC
650	1	7	_aPlant breeding _gAGROVOC _2 _91203
700	1		_aGoldsbrough, P.B., _ecoaut.
700	1		_aGrote, E.M., _ecoaut.
700	1		_aRibaut, J.M.|Poland, D. _eeds.
700	1		_aTuinstra, M.R., _ecoaut.
942			_cPRO
999			_c5170 _d5170