000			04172nam a22003137a 4500
001			G98770
003			MX-TxCIM
005			20240919020959.0
008			121211s ||||f| 0 p|p||0|| |
040			_aMX-TxCIM
090			_aCIS-7564
100	1		_91843 _aRosewarne, G.M. _gGlobal Wheat Program _8INT3219 _uInternational Wheat Genetics Symposium, 12; Pacifico Yokohama (Japan); 8-14 Sep 2013. Program and Abstract Book
245	0	0	_aA review of quantitative trait loci associated with stripe rust resistance in wheat
260			_c2013
300			_ap. 166
500			_aAbstract only
520			_aGlobally, wheat is the most important food crop, the most traded food crop and is the main source of caloric intake for over 2.5 billion poor people. Major constraints to wheat production can affect global food security. The major biotic constraint to wheat production is the disease of stripe rust, caused by Puccinia striiformis. Since the beginning of this century, changes in virulence and aggressiveness of this pathogen have seen severe epidemics of new pathotypes sweep the globe. Breeding resistant varieties is the best method to control this disease. This is most easily done through the incorporation of seedling (all-stage) resistance genes that usually confer immunity. However this resistance places a strong selection pressure on the fungus to evolve, with specific genes often lasting only a few years before breaking down, leaving the crop susceptible. Quantitative resistance genes can provide near-immunity to the disease if 4-5 loci are combined in the same genetic background. Many of these types of genes are considered durable and have been effectively used for up to 80 years. The first publications relating to quantitative trait loci to stripe rust in wheat appeared in 2000. Since then there have been 34 publications that have identified over 140 QTLs. By taking the flanking markers to each of these QTLs, and placing them on consensus maps, a picture of the current known diversity of these types of genes is revealed. There are at least 49 regions on the wheat genome that are known to contribute to disease resistance. Some of the more commonly identified regions have pleiotropic effects, exemplified through the cloning of the Lr34/ Yr18/Sr57/Pm38/Ltn1 gene. This gene confers partial resistance to multiple iseases including leaf, stripe and stem rust, powdery mildew and also confers the phenotypic marker of leaf tip necrosis. Other likely pleiotropic loci that have been identified in multiple QTL analyses include the Lr46/Yr29/Pm39/Ltn2 locus on chromosome 1BL, Lr67/Yr46/Sr55/Pm46/Ltn3 on 4D and the Sr2/Yr30/Lr27/Pbc1 locus on 3BS. As these loci are generally only observed to be effective in the adult plant stage, they have been termed Pleiotropic Adult Plant (PAP) resistances. Another class of quantitative resistances are the High Temperature Adult Plant (HTAP) resistances that are ineffective in seedlings and in plants grown under lower temperatures, but usually confer quite high levels of resistance in adult plants grown under high temperatures. Two HTAP loci have been given gene designations, Yr36 on 6BS and Yr39 on 7BL with the former being cloned. Other HTAP loci have been identified on 1BL, 2BS, 2DS, 3BL, 5B and 6AS. Finally there are numerous other genomic regions that confer low levels of partial resistance to stripe rust. Often these are not significant in all environments tested, but can work in an additive fashion when combined with each other and the above mentioned PAP and HTAP loci to confer durable resistance. This paper will outline the most important genomic regions that will benefit from future research.
536			_aGlobal Wheat Program
546			_aEnglish
593			_aLucia Segura
594			_aINT3219|INT0610|INT2833|INT3206|INT2411
595			_aCSC
700	1		_aHerrera-Foessel, S.A., _ecoaut.
700	1		_aHuerta-Espino, J. _gGlobal Wheat Program _8CHUE01 _9397
700	1		_aSingh, R.P. _gGlobal Wheat Program _8INT0610 _9825
700	1		_aHe Zhonghu _gGlobal Wheat Program _8INT2411 _9838
700	1		_9901 _aCaixia Lan _gGlobal Wheat Program _8INT3206 _ecoaut.
942			_cPRO
999			_c8810 _d8810