Adult Plant Resistance of Thatcher Wheat to Stem Rust

Nrx, Nazareno; Ap, Roelfs

doi:10.1094/phyto-71-181

Cited by 24 publications

(13 citation statements)

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“…Since both parents showed susceptible infection types to these three races during seedling screening and were negative for the presence of Sr42 during marker screening, Sr42 may not be present in either parent. Another all-stage resistance gene present on 6DS, Sr5, is not effective against races in the Ug99 lineage ) and does not provide APR to stem rust when deployed singly, but it may be involved in APR when used with other genes (Nazareno and Roelfs 1981;Knott 2001). We do not have sufficient information to investigate the relationship between QSr.umn-6D and Sr5.…”

Section: Discussionmentioning

confidence: 94%

QTL mapping of adult plant resistance to Ug99 stem rust in the spring wheat population RB07/MN06113-8

et al. 2015

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The emergence and spread of the Ug99 race group of the stem rust pathogen (Puccinia graminis Pers. f. sp. tritici) in the past decade have exposed the vulnerability of wheat (Triticum aestivum L.) to this disease. Discovery of novel and effective sources of resistance is vital for breeding resistant varieties to avert losses. The experimental breeding line MN06113-8 and cultivar RB07 developed by the University of Minnesota wheat breeding program exhibited adult plant resistance (APR) to the Ug99 race group in field tests in Kenya and Ethiopia. Both lines were found to be susceptible at the seedling stage to isolates of the race TTKSK, TTKST, and TTTSK. To dissect the genetic mechanism of resistance present in these lines, MN06113-8 was crossed to RB07 to generate 141 F 6 recombinant inbred lines (RILs). The RIL population was evaluated for APR to Ug99 in Kenya and Ethiopia over three seasons and for resistance to North American stem rust pathogen races in St. Paul, MN, in one season. The population was genotyped using high-throughput SNP genotyping assays. Composite interval mapping detected six quantitative trait loci (QTL) involved in APR to African stem rust races and three QTLs involved in stem rust resistance to North American stem rust races. One QTL located on chromosome 2B was associated with APR to stem rust races in all environments. Development of diagnostic markers linked to this gene will facilitate marker-assisted selection of resistant lines to develop varieties with enhanced levels of stem rust resistance.Keywords Linkage mapping Á Recombinant inbred lines Á Stem rust Á Ug99 Á Genotyping by sequencing Á Resistance breeding Key messageThis study reports the detection of QTL associated with resistance to the Ug99 race group of stem rust of wheat, in US spring wheat breeding germplasm.Electronic supplementary material The online version of this article (

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Section: Discussionmentioning

confidence: 94%

QTL mapping of adult plant resistance to Ug99 stem rust in the spring wheat population RB07/MN06113-8

et al. 2015

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“…The results of the present study indicate that seedling genes Sr12 and Sr16 may have contributed to Weld resistance. Nazareno and Roelfs (1981) studied segregating F 6 lines of Baart/Thatcher, and found no relationship between seedling resistance genes Sr9g, Sr5, and Sr16 and Weld resistance. They did, however, observe that lines with both Sr12 and SrTc had better Weld resistance than lines lacking both genes, although they concluded that the resistance must have come from a linked gene and not from either seedling gene per se, since there were susceptible lines that had both Sr12 and SrTc.…”

Section: Discussionmentioning

confidence: 99%

“…An additional seedling resistance gene temporarily designated SrTc has not been mapped, and other seedling resistances have not been fully described (Knott 2001;Nazareno and Roelfs 1981). The Sr genes confer resistance to some races of stem rust, but generally do not confer eVective resistance to the stem rust races currently found in the US (Kolmer et al 1991;Nazareno and Roelfs 1981).…”

Section: Introductionmentioning

confidence: 99%

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Genetics of stem rust resistance in the spring wheat cultivar Thatcher and the enhancement of stem rust resistance by Lr34

2007

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Three recombinant inbred line populations from the crosses RL6071/Thatcher, RL6071/ RL6058 (Thatcher Lr34), and Thatcher/RL6058, were used to study the genetics of stem rust resistance in Thatcher and TcLr34. Segregation of stem rust response in each population was used to determine the number of genes conferring resistance, as well as the eVect of the leaf rust resistance gene Lr34 on stem rust resistance. The relationship between resistance in seedling and adult plants was also examined, and an attempt was made to identify microsatellite markers linked to genes that were eVective in adult plants. In Weld plot tests at least three additive resistance genes segregated in the RL6071/RL6058 population, whereas two resistance genes segregated in the RL6071/Thatcher population. The presence of the gene Lr34 permitted the expression of additional stem rust resistance in Thatcher-derived lines both at the seedling and adult plant stages. Seedling resistance to races TPMK and RKQQ was signiWcantly associated with resistance in adult plants, whereas seedling resistance to races QCCD and QCCB may have made a minor contribution. The seedling resistance genes Sr16 and Sr12 may have contributed to resistance in adult plants. A molecular marker linked to resistance in adult plants was identiWed on chromosome 2BL.

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“…For example, 'Thatcher' gives a 0; (fleck) infection type to race 56 at the seedling stage, but none of the genes it is known to carry condition better than an infection type 2 (Green and Dyck 1975;Nazareno and Roelfs 1981). It is not known whether the fleck infection type results from additive effects of two or more effective genes, or from modifying effects, or both.…”

Section: Introductionmentioning

confidence: 99%

Genetic interactions among four genes for resistance to stem rust in bread wheat

Knott¹,

Weller²

1988

Genome

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1988. Genetic interactions among four genes for resistance to stem rust in bread wheat. Genome, 30: 182 -185. Near-isogenic lines of bread wheat (Triticum aestivum L.) carrying the genes Sr7a, Sr8a, Sr9b, and S r l l for stem rust (Puccinia graminis f. sp. tritici Eriks. and Henn.) resistance had been developed previously using nine backcrosses to the cultivar Marquis. The lines were intercrossed to produce the six possible two-gene combinations and three of the four possible three-gene combinations. The objective was to test for additive, modifying, or residual effects of the genes. The nine combinations, the four near-isogenic parents, 'Marquis', and three near-isogenic lines with only five backcrosses to 'Marquis' were tested. Seedling tests with five races were done in a growth room and field tests were done with two races. Relatively few interactions among the genes were detected in the seedling tests. All involved small additive effects when Sr7a was combined with either Sr8a or Sr9b. Interactions were much more common in the field tests. With race 56, the three two-gene combinations of Sr8a, Sr9b, and S r l l showed significant additive effects. With race 15B-1, there were four cases of an ineffective gene modifying the effect of an effective gene. In addition, the data indicated that Sr9b and possibly S r l l had residual effects against race 15B-1. The reaction of a genotype to stem rust in the field clearly involves a complex interaction of effective and ineffective genes. among four genes for resistance to stem rust in bread wheat.Genome, 30 p: 182 -185. Des lignkes de blk panifiable (Triticum aestivum L.), pratiquement isogkniques, porteuses des gknes Sr7a, Sr8a, Sr9b et S r l l pour la rksistance B la rouille de la tige (Puccinia graminis f. sp. tritici Eriks. et Henn.) ont kt6 produites antkrieurement au moyen de neuf rktrocroisements avec le cultivar Marquis. Ces lignkes furent croiskes entre elles en vue de produire les six combinaisons possibles de deux gknes et trois des quatres combinaisons possibles de trois gknes. L'objectif ktait de vkrifier les effets additifs, modificateurs ou rksiduels des gknes. Les tests de rksistance B la rouille des tiges ont kt6 effectuks avec les neuf combinaisons, les quatre parents presque isogkniques, le cv. Marquis et trois lignkes presque isogkniques avec seulement cinq rktrocroisements avec le cv. Marquis. Les tests furent faits en chambre de croissance sur des plantules, avec cinq races de P. graminis f. sp. tritici et, en plein champs, avec seulement deux races. Les tests de plantules n'ont rkvklk que relativement peu d'interactions entre les gknes. Toutes les interactions impliquaient de petits effets additifs lorsque le gkne Sr7a ktait combin6 soit avec le Sr8a ou le Sr9b. Les tests de plein champs ont rkvklk des interactions beaucoup plus marqukes. Ainsi, avec la race 56, les trois combinaisons de deux gknes, Sr8a, Sr9b et S r l l ont montrk des effets additifs significatifs. Avec la race 15B-1, il y a eu quatre cas oti un gkne inefficace a modifik l'effe...

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Adult Plant Resistance of Thatcher Wheat to Stem Rust

Cited by 24 publications

References 0 publications

QTL mapping of adult plant resistance to Ug99 stem rust in the spring wheat population RB07/MN06113-8

QTL mapping of adult plant resistance to Ug99 stem rust in the spring wheat population RB07/MN06113-8

Genetics of stem rust resistance in the spring wheat cultivar Thatcher and the enhancement of stem rust resistance by Lr34

Genetic interactions among four genes for resistance to stem rust in bread wheat

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