000 02949nam a22004217a 4500
001 70461
003 MX-TxCIM
005 20190315194140.0
008 121211s ||||f| 0 p|p||0|| |
020 _a92-9146-058-3
040 _aMX-TxCIM
072 0 _aF30
072 0 _aH20
110 2 _aCentro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Addis Ababa (Ethiopia)
100 1 _9825
_aSingh, R.P.
_gGlobal Wheat Program
_8INT0610
_uRegional Wheat Workshop for Eastern, Central and Southern Africa, 10; University of Stellenbosch, South Africa; 14-18 Sep 1998
245 0 0 _aCombining additive genes for slow rusting type of resistance to leaf and stripe rusts in wheat
260 _aAddis Ababa (Ethiopia)
_bCIMMYT :
_c1999
340 _aPrinted|Computer File
520 _aSlow rusting type of resistance in wheat (Triticum aestivum) to leaf rust (Puccinia recondita tritici) and stripe rust (Puccinia striiformis tritici) is often conferred by a few partially effective, non-hypersensitive type of genes with additive effects. Inheritance studies at CIMMYT have shown that although individually these genes may have small to intermediate effects, combinations of 3 to 5 such genes result in a high level of resistance. We planned a breeding experiment aimed to combine such genes for resistance to both leaf and stripe rusts with high yield potential. Simple crosses were made between parents that had moderate to good levels of slow rusting resistance to both rusts; the F 1S were then top-crossed (three-way) with a third parent that had high yield potential and at least some resistance. Segregating generations were alternated between Ciudad Obregon (28 ºN, 39 m a.s.1., irrigated, high yielding site with high leaf rust pressure) and Toluca (18 ºN, 2640 m a.s.l., high rainfall site with high stripe rust pressure) in Mexico. Selection pressure was mild for resistance but strong for plant morphology in the early segregating generations. Selected plants were advanced to higher generations as bulk. Plants with good morphology and high level of resistance were advanced as pedigree in the F 5 generation. We have identified lines that combine high yield potential with high levels of resistance based on additive genes to both rusts in Mexican and other global environments.
536 _aGlobal Wheat Program
546 _aEnglish
591 _a0007|AGRIS 0101|R99-00CIMPU|AL-Wheat Program
593 _aJose Juan Caballero
594 _aINT0610
650 1 0 _aCombining ability
_92367
650 1 0 _aDisease resistance
_91077
650 1 0 _aGenetic inheritance
650 1 0 _aPlant diseases
_91206
650 1 0 _aPuccinia recondita
650 1 0 _91842
_aPuccinia striiformis
_gAGROVOC
650 1 0 _aRusts
_91251
653 0 _aCIMMYT
650 1 0 _91296
_aTriticum aestivum
_gAGROVOC
650 1 0 _91130
_aGenetics
_gAGROVOC
700 1 _9397
_aHuerta-Espino, J.
_ecoaut.
700 1 _9661
_aRajaram, S.
_ecoaut.
942 _cPRO
_2ddc
999 _c4515
_d4515