000			03724nam a22003977a 4500
001			G95047
003			MX-TxCIM
005			20240919020958.0
008			231222s2011 xxu||||| |||| 00| 0 eng d
020			_a978-0-615-54519-6
040			_aMX-TxCIM
041			_aeng
090			_aCIS-6327
100	1		_9867 _aBhavani, S. _gGlobal Wheat Program _8INT2843
245	1	0	_aMapping of durable adult plant stem rust resistance in six CIMMYT wheats to Ug99 group of races
260			_aSaint Paul, MN (USA) : _bBorlaug Global Rust Initiative, _c2011.
520			_aDurable resistance to wheat stem rust can be achieved by developing and deploying varieties that have race-nonspecific, adult plant resistance (APR) conferred by multiple minor, slow rusting genes. Wheat lines ‘Kingbird, ‘Kiritati’, ‘Huirivis#1’, ‘Juchi’, ‘Muu’ and ‘Pavon 76’ showed high levels of APR to the Ug99 group of races when tested in Kenya. F5 and F6 generation recombinant inbred line (RIL) populations developed from crosses of moderately susceptible ‘PBW343’ with five resistant parents were used in mapping. The nonSr26 fraction of an ‘Avocet’ x Pavon 76 RIL population developed earlier for leaf rust and stripe rust resistance studies was also included. Field phenotyping of the parents and RILs were conducted at Njoro, Kenya, for at least two years with the Ug99+Sr24 (TTKST) race. Continuous variation of APR in each RIL population and genetic analyses indicated quantitative resistance governed by 3 or 4 minor genes. Single and joint year analyses by Inclusive Composite Interval Mapping (ICIM) using informative DArT and/or SSR markers identified consistent APR QTLs on chromosomes 1A, 3BS, 5BL, 7A and 7DS in Kingbird; 2D, 3BS, 5BL and 7DS in Kiritati; 2B, 3BS, 4A, 5BL and 6B in Juchi; 2B, 3BS and 7B in Huirivis#1; 2B, 3BS and 5BL in Muu; and 1BL, 3BS, 5A and 6B in Pavon 76. The QTLs in each genomic region explained 10- 46% of the phenotypic variation for APR. Pseudo-black chaff phenotype associated with APR gene Sr2 on chromosome 3BS in all six resistant parents and identi& cation of an APR QTL in the same region in all mapping populations confirmed the role of Sr2 in reducing stem rust severity. The 1BL QTL in Pavon 76 was in the same region as the pleiotropic APR gene Lr46/Yr29/Pm39. Similarly, a 7DS QTL in Kingbird and Huirivis#1 was in same chromosomal region as pleiotropic APR gene Lr34/Yr18/Pm38. These results indicate that the above two pleiotropic resistance genes confer APR to stem rust in addition to leaf rust, yellow rust and powdery mildew. Further studies are underway to saturate the genomic regions harboring new APR QTLs with additional molecular markers.
536			_aGenetic Resources Program|Global Wheat Program
546			_aText in English
594			_aINT2843|INT0610|INT3098
650		7	_91251 _aRusts _2AGROVOC
650		7	_91077 _aDisease resistance _2AGROVOC
650		7	_92130 _aPuccinia graminis _2AGROVOC
650		7	_91296 _aTriticum aestivum _2AGROVOC
700	1		_aSingh, R.P. _gGlobal Wheat Program _8INT0610 _9825
700	1		_aArgillier, O. _932571
700	1		_aHuerta-Espino, J. _gGlobal Wheat Program _8CHUE01 _9397
700	1		_9892 _aSukhwinder-Singh _gGenetic Resources Program _8INT3098
700	1		_aNjau, P.N. _92089
700	1		_aBrun, S. _932572
700	1		_aLacam, S. _932573
700	1		_aDesmouceaux, N. _932574
711	1		_93231 _aBGRI Workshop _d(June 13-16, 2011 : _cSaint Paul, Minnesota, USA)
773	0		_dSaint Paul, MN (USA) : Borlaug Global Rust Initiative, 2011. _gp. 43-53 _tBorlaug Global Rust Initiative : 2011 Technical Workshop June 13-16 Saint Paul, Minnesota, U.S.A. _w59619 _z978-0-615-54519-6
942			_cCPA _2ddc _n0
999			_c8097 _d8097