Genetic analysis and mapping of seedling resistance to Septoria tritici blotch in ‘Steele-ND’/‘ND 735’ bread wheat population

2013 ◽  
Vol 41 (2) ◽  
pp. 199-210 ◽  
Author(s):  
M. Mergoum ◽  
V. Harilal ◽  
P. Singh ◽  
T. Adhikari ◽  
A. Kumar ◽  
...  
Keyword(s):  
Genetic Analysis ◽  
Bread Wheat ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Seedling Resistance ◽  
Wheat Population

Mining synthetic hexaploids for multiple disease resistance to improve bread wheat

2008 ◽  
Vol 59 (5) ◽  
pp. 421 ◽  
Author(s):  
F. C. Ogbonnaya ◽  
M. Imtiaz ◽  
H. S. Bariana ◽  
M. McLean ◽  
M. M. Shankar ◽  
...  
Keyword(s):  
Disease Resistance ◽  
Leaf Rust ◽  
Resistance Gene ◽  
Bread Wheat ◽  
Stripe Rust ◽  
Stem Rust ◽  
Wheat Yield ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Seedling Resistance

A collection of 253 synthetic hexaploid wheats (SHWs) produced from 192 Aegilops tauschii accessions and 39 elite durum varieties were studied to identify, characterise, and evaluate potentially untapped diversity of disease resistance in wheat. The diseases for which resistance was sought included cereal cyst nematode (CCN), root lesion nematode (RLN), Stagonospora nodorum blotch (SNB), Septoria tritici blotch (STB), and the 3 rusts, leaf rust, stem rust, and stripe rust, all important diseases of bread wheat worldwide, which can severely reduce wheat yield and quality. The SHWs exhibited a wide spectrum of resistance to the 8 pathogens. The frequency of disease-resistant SHWs ranged from 1% for one species of RLN (Pratylenchus neglectus), 3% and 10% for Septoria nodorum leaf and glume blotch, 10% for seedling resistance to yellow leaf spot, 16% for CCN, 21% for the second species of RLN (Pratylenchus thornei), 73% for Septoria tritici blotch, and 15%, 40%, and 24% for leaf rust, stem rust, and stripe rust, respectively. Five SHWs, Aus26860, Aus30258, Aus30294, Aus30301, and Aus30304, exhibited high levels of resistance to CCN, YLP, STB, LR, and SR, while 56 SHWs showed resistance to either 3 or 4 diseases. The genetics of resistance to CCN in some of the SHWs revealed that some of the accessions carry the same CCN gene(s) against pathotype Ha13, while others may carry different resistance gene(s). Additional studies were carried out to understand the relationship between the resistances identified in SHWs and the ones already present in common wheat, in particular the resistance genes Cre1 and Cre3 against CCN. The use of perfect markers associated with Cre1 and Cre3 suggested that some SHWs may carry a new CCN resistance gene(s), which could be deployed in breeding programs to increase the diversity of available resistance. The identification of SHWs with resistance to a range of diseases provides an opportunity to generate genetic knowledge and resistant germplasm to be used in future variety development.

Molecular mapping and physical location of major gene conferring seedling resistance to Septoria tritici blotch in wheat

2009 ◽  
Vol 24 (2) ◽  
pp. 153-164 ◽  
Author(s):  
R. Raman ◽  
A. W. Milgate ◽  
M. Imtiaz ◽  
M.-K. Tan ◽  
H. Raman ◽  
...  
Keyword(s):  
Molecular Mapping ◽  
Major Gene ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Seedling Resistance ◽  
Physical Location

The genetic architecture of seedling resistance to Septoria tritici blotch in the winter wheat doubled-haploid population Solitär × Mazurka

2011 ◽  
Vol 29 (3) ◽  
pp. 813-830 ◽  
Author(s):  
Christiane Kelm ◽  
S. Mahmod Tabib Ghaffary ◽  
Helge Bruelheide ◽  
Marion S. Röder ◽  
Sebastian Miersch ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Doubled Haploid ◽  
Genetic Architecture ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Doubled Haploid Population ◽  
Seedling Resistance ◽  
Haploid Population

scholarly journals Partial Resistance to Septoria Tritici Blotch (Mycosphaerella graminicola) in Wheat Cultivars Arina and Riband

2004 ◽  
Vol 94 (5) ◽  
pp. 497-504 ◽  
Author(s):  
L. Chartrain ◽  
P. A. Brading ◽  
J. P. Widdowson ◽  
J. K. M. Brown
Keyword(s):  
Partial Resistance ◽  
Single Gene ◽  
Heading Date ◽  
Wheat Breeding ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Adult Plant ◽  
Doubled Haploid Population ◽  
Seedling Resistance ◽  
Plant Trials

Partial resistance to Septoria tritici blotch (STB) and its inheritance were investigated in a doubled-haploid population of a cross between cvs. Arina and Riband. The former has good partial resistance whereas the latter is susceptible. In adult plant trials in polytunnels, STB disease scores were negatively correlated with heading date. Resistance was not specific to any of the three fungal isolates used in these tests. A quantitative trait locus (QTL) for partial resistance to STB was identified in Riband on chromosome 6B and is named QStb.psr-6B-1. No QTL controlling a major part of the Arina resistance was identified, suggesting that its resistance may be dispersed and polygenic. There was no correlation between the lines' mean disease scores at the seedling and adult stages, implying that partial resistance to STB is developmentally regulated. Seedling resistance to the isolate IPO323 was isolate-specific and controlled by a single gene in Arina, probably allelic with the Stb6 gene in cv. Flame that confers resistance to the same isolate. The implications of these results for wheat breeding programs are discussed.

scholarly journals Identification of Resistance Sources and Genome-Wide Association Mapping of Septoria Tritici Blotch Resistance in Spring Bread Wheat Germplasm of ICARDA

2021 ◽  
Vol 12 ◽  
Author(s):  
Sara Louriki ◽  
Sajid Rehman ◽  
Samira El Hanafi ◽  
Yassine Bouhouch ◽  
Muamar Al-Jaboobi ◽  
...  
Keyword(s):  
Association Mapping ◽  
Bread Wheat ◽  
Hot Spot ◽  
Septoria Tritici Blotch ◽  
Adult Plant ◽  
Phenotypic Variance ◽  
Spring Bread Wheat ◽  
Seedling Resistance ◽  
Adult Plant Stage ◽  
Plant Stage

Septoria tritici blotch (STB) of wheat, caused by the ascomycete Zymoseptoria tritici (formerly Mycosphaerella graminicola), is one of the most important foliar diseases of wheat. In Morocco, STB is a devastating disease in temperate wheat-growing regions, and the yield losses can exceed up to 50% under favorable conditions. The aims of this study were to identify sources of resistance to STB in Septoria Association Mapping Panel (SAMP), which is composed of 377 advanced breeding lines (ABLs) from spring bread wheat breeding program of ICARDA, and to identify loci associated with resistance to STB at seedling (SRT) as well as at the adult plant (APS) stages using genome-wide association mapping (GWAM). Seedling resistance was evaluated under controlled conditions with two virulent isolates of STB (SAT-2 and 71-R3) from Morocco, whereas adult plant resistance was assessed at two hot spot locations in Morocco (Sidi Allal Tazi, Marchouch) under artificial inoculation with a mixture of STB isolates. At seedling stage, 45 and 32 ABLs were found to be resistant to 71-R3 and SAT-2 isolates of STB, respectively. At adult plant stage, 50 ABLs were found to be resistant at hot spot locations in Morocco. Furthermore, 10 genotypes showed resistance in both locations during two cropping seasons. GWAM was conducted with 9,988 SNP markers using phenotypic data for seedling and the adult plant stage. MLM model was employed in TASSEL 5 (v 5.2.53) using principal component analysis and Kinship Matrix as covariates. The GWAM analysis indicated 14 quantitative trait loci (QTL) at the seedling stage (8 for isolate SAT-2 and 6 for isolate 71-R3), while 23 QTL were detected at the adult plant stage resistance (4 at MCH-17, 16 at SAT-17, and 3 at SAT-18). SRT QTL explained together 33.3% of the phenotypic variance for seedling resistance to STB isolate SAT-2 and 28.3% for 71-R3, respectively. QTL for adult plant stage resistance explained together 13.1, 68.6, and 11.9% of the phenotypic variance for MCH-17, SAT-17, and SAT-18, respectively. Identification of STB-resistant spring bread wheat germplasm in combination with QTL detected both at SRT and APS stage will serve as an important resource in STB resistance breeding efforts.

scholarly journals Genetic Analysis Using a Multi-Parent Wheat Population Identifies Novel Sources of Septoria Tritici Blotch Resistance

Genes ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 887
Author(s):  
Adnan Riaz ◽  
Petra KockAppelgren ◽  
James Gerard Hehir ◽  
Jie Kang ◽  
Fergus Meade ◽  
...  
Keyword(s):  
Natural Infection ◽  
Resistance Breeding ◽  
Triticum Aestivum L ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Zymoseptoria Tritici ◽  
Sources Of Resistance ◽  
Wheat Varieties ◽  
Wheat Population ◽  
Disease Management Strategy

Zymoseptoria tritici is the causative fungal pathogen of septoria tritici blotch (STB) disease of wheat (Triticum aestivum L.) that continuously threatens wheat crops in Ireland and throughout Europe. Under favorable conditions, STB can cause up to 50% yield losses if left untreated. STB is commonly controlled with fungicides; however, a combination of Z. tritici populations developing fungicide resistance and increased restrictions on fungicide use in the EU has led to farmers relying on fewer active substances. Consequently, this serves to drive the emergence of Z. tritici resistance against the remaining chemistries. In response, the use of resistant wheat varieties provides a more sustainable disease management strategy. However, the number of varieties offering an adequate level of resistance against STB is limited. Therefore, new sources of resistance or improved stacking of existing resistance loci are needed to develop varieties with superior agronomic performance. Here, we identified quantitative trait loci (QTL) for STB resistance in the eight-founder “NIAB Elite MAGIC” winter wheat population. The population was screened for STB response in the field under natural infection for three seasons from 2016 to 2018. Twenty-five QTL associated with STB resistance were identified in total. QTL either co-located with previously reported QTL or represent new loci underpinning STB resistance. The genomic regions identified and the linked genetic markers serve as useful resources for STB resistance breeding, supporting rapid selection of favorable alleles for the breeding of new wheat cultivars with improved STB resistance.

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