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 Molecular Mapping of the Stb4 Gene for Resistance to Septoria tritici Blotch in Wheat

2004 ◽  
Vol 94 (11) ◽  
pp. 1198-1206 ◽  
Author(s):  
Tika B. Adhikari ◽  
Jessica R. Cavaletto ◽  
Jorge Dubcovsky ◽  
Jorge Omar Gieco ◽  
Ana Rosa Schlatter ◽  
...  
Keyword(s):  
Molecular Mapping ◽  
Bulked Segregant Analysis ◽  
Recombinant Inbred Lines ◽  
Single Gene ◽  
Effective Means ◽  
Wheat Chromosome ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Adult Plant ◽  
Field Season

Breeding wheat for resistance is the most effective means to control Septoria tritici blotch (STB), caused by the ascomycete Mycosphaerella graminicola (anamorph Septoria tritici). At least eight genes that confer resistance to STB in wheat have been identified. Among them, the Stb4 locus from the wheat cv. Tadinia showed resistance to M. graminicola at both seedling and adult-plant stages. However, no attempt has been made to map the Stb4 locus in the wheat genome. A mapping population of 77 F10 recombinant-inbred lines (RILs) derived from a three-way cross between the resistant cv. Tadinia and the susceptible parent (Yecora Rojo × UC554) was evaluated for disease resistance and molecular mapping. The RILs were tested with Argentina isolate I 89 of M. graminicola for one greenhouse season in Brazil during 1999, with an isolate from Brazil (IPBr1) for one field season in Piracicaba (Brazil) during 2000, and with Indiana tester isolate IN95-Lafayette-1196-WW-1-4 in the greenhouse during 2000 and 2001. The ratio of resistant:susceptible RILs was 1:1 in all three tests, confirming the single-gene model for control of resistance to STB in Tadinia. However, the patterns of resistance and susceptibility were different between the Indiana isolate and those from South America. For example, the ratio of RILs resistant to both the Indiana and Argentina isolates, resistant to one but susceptible to the other, and susceptible to both isolates was approximately 1:1:1:1, indicating that Tadinia may contain at least two genes for resistance to STB. A similar pattern was observed between the Indiana and Brazil isolates. The gene identified with the Indiana tester isolate was assumed to be the same as Stb4, whereas that revealed by the South American isolates may be new. Bulked-segregant analysis was used to identify amplified fragment length polymorphism (AFLP) and microsatellite markers linked to the presumed Stb4 gene. The AFLP marker EcoRI-ACTG/MseI-CAAA5 and microsatellite Xgwm111 were closely linked to the Stb4 locus in coupling at distances of 2.1 and 0.7 centimorgans (cM), respectively. A flanking marker, AFLP EAGG/ M-CAT10, was 4 cM from Stb4. The Stb4 gene was in a potential supercluster of resistance genes near the centromere on the short arm of wheat chromosome 7D that also contained Stb5 plus five previously identified genes for resistance to Russian wheat aphid. The microsatellite marker Xgwm111 identified in this study may be useful for facilitating the transfer of Stb4 into improved cultivars of wheat.

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 QTL Mapping of Seedling and Adult Plant Resistance to Septoria Tritici Blotch in Winter Wheat cv. Mandub (Triticum aestivum L.)

Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1108
Author(s):  
Dominika Piaskowska ◽  
Urszula Piechota ◽  
Magdalena Radecka-Janusik ◽  
Paweł Czembor
Keyword(s):  
Mapping Population ◽  
Triticum Aestivum L ◽  
Seedling Stage ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Adult Plant ◽  
Resistance Locus ◽  
Phenotypic Variance ◽  
Breeding Programs ◽  
Plant Stage

Septoria tritici blotch (STB) is one of the most devastating foliar diseases of wheat worldwide. Host resistance is the most economical and safest method of controlling the disease, and information on resistance loci is crucial for effective breeding for resistance programs. In this study we used a mapping population consisting of 126 doubled-haploid lines developed from a cross between the resistant cultivar Mandub and the susceptible cultivar Begra. Three monopycnidiospore isolates of Z. tritici with diverse pathogenicity were used to test the mapping population and parents’ STB resistance at the seedling stage (under a controlled environment) and adult plant stage (polytunnel). For both types of environments, the percentage leaf area covered by necrosis (NEC) and pycnidia (PYC) was determined. A linkage map comprising 5899 DArTSNP and silicoDArT markers was used for the quantitative trait loci (QTL) analysis. The analysis showed five resistance loci on chromosomes 1B, 2B and 5B, four of which were derived from cv. Mandub. The location of QTL detected in our study on chromosomes 1B and 5B may suggest a possible identity or close linkage with Stb2/Stb11/StbWW and Stb1 loci, respectively. QStb.ihar-2B.4 and QStb.ihar-2B.5 detected on chromosome 2B do not co-localize with any known Stb genes. QStb.ihar-2B.4 seems to be a new resistance locus with a moderate effect (explaining 29.3% of NEC and 31.4% of PYC), conferring resistance at the seedling stage. The phenotypic variance explained by QTL detected in cv. Mandub ranged from 11.9% to 70.0%, thus proving that it is a good STB resistance source and can potentially be utilized in breeding programs.

scholarly journals Association between Septoria tritici Blotch, Plant Height, and Heading Date in Wheat

2005 ◽  
Vol 97 (4) ◽  
pp. 1072-1081 ◽  
Author(s):  
María Rosa Simón ◽  
Analía E. Perelló ◽  
Cristina A. Cordo ◽  
Silvina Larrán ◽  
Peter E. L. van der Putten ◽  
...  
Keyword(s):  
Plant Height ◽  
Heading Date ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici

scholarly journals Sources of resistance to septoria tritici blotch and implications for wheat breeding

2004 ◽  
Vol 53 (4) ◽  
pp. 454-460 ◽  
Author(s):  
L. Chartrain ◽  
P. A. Brading ◽  
J. C. Makepeace ◽  
J. K. M. Brown
Keyword(s):  
Wheat Breeding ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Sources Of Resistance

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

scholarly journals Genome-Wide Association Study Reveals Novel Genetic Loci for Quantitative Resistance to Septoria Tritici Blotch in Wheat (Triticum aestivum L.)

2021 ◽  
Vol 12 ◽  
Author(s):  
Tilahun Mekonnen ◽  
Clay H. Sneller ◽  
Teklehaimanot Haileselassie ◽  
Cathrine Ziyomo ◽  
Bekele G. Abeyo ◽  
...  
Keyword(s):  
Genome Wide Association Study ◽  
Agronomic Traits ◽  
Defense Responses ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Adult Plant ◽  
Putative Qtls ◽  
Association Panel ◽  
A Genome ◽  
Trait Associations

Septoria tritici blotch, caused by the fungus Zymoseptoria titici, poses serious and persistent challenges to wheat cultivation in Ethiopia and worldwide. Deploying resistant cultivars is a major component of controlling septoria tritici blotch (STB). Thus, the objective of this study was to elucidate the genomic architecture of STB resistance in an association panel of 178 bread wheat genotypes. The association panel was phenotyped for STB resistance, phenology, yield, and yield-related traits in three locations for 2 years. The panel was also genotyped for single nucleotide polymorphism (SNP) markers using the genotyping-by-sequencing (GBS) method, and a total of 7,776 polymorphic SNPs were used in the subsequent analyses. Marker-trait associations were also computed using a genome association and prediction integrated tool (GAPIT). The study then found that the broad-sense heritability for STB resistance ranged from 0.58 to 0.97 and 0.72 to 0.81 at the individual and across-environment levels, respectively, indicating the presence of STB resistance alleles in the association panel. Population structure and principal component analyses detected two sub-groups with greater degrees of admixture. A linkage disequilibrium (LD) analysis in 338,125 marker pairs also detected the existence of significant (p ≤ 0.01) linkage in 27.6% of the marker pairs. Specifically, in all chromosomes, the LD between SNPs declined within 2.26–105.62 Mbp, with an overall mean of 31.44 Mbp. Furthermore, the association analysis identified 53 loci that were significantly (false discovery rate, FDR, <0.05) associated with STB resistance, further pointing to 33 putative quantitative trait loci (QTLs). Most of these shared similar chromosomes with already published Septoria resistance genes, which were distributed across chromosomes 1B, 1D, 2A, 2B, 2D, 3A,3 B, 3D, 4A, 5A, 5B, 6A, 7A, 7B, and 7D. However, five of the putative QTLs identified on chromosomes 1A, 5D, and 6B appeared to be novel. Dissecting the detected loci on IWGSC RefSeq Annotation v2.1 revealed the existence of disease resistance-associated genes in the identified QTL regions that are involved in plant defense responses. These putative QTLs explained 2.7–13.2% of the total phenotypic variation. Seven of the QTLs (R2 = 2.7–10.8%) for STB resistance also co-localized with marker-trait associations (MTAs) for agronomic traits. Overall, this analysis reported on putative QTLs for adult plant resistance to STB and some important agronomic traits. The reported and novel QTLs have been identified previously, indicating the potential to improve STB resistance by pyramiding QTLs by marker-assisted selection.

scholarly journals Exploitation of nuclear and cytoplasm variability in Hordeum chilense for wheat breeding

2011 ◽  
Vol 9 (2) ◽  
pp. 313-316 ◽  
Author(s):  
Cristina Rodríguez-Suárez ◽  
María J. Giménez ◽  
María C. Ramírez ◽  
Azahara C. Martín ◽  
Natalia Gutierrez ◽  
...  
Keyword(s):  
Abiotic Stress Tolerance ◽  
Female Parent ◽  
Wheat Breeding ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Carotenoid Content ◽  
Hordeum Chilense ◽  
Male Sterile ◽  
Alloplasmic Lines ◽  
Ideal System

Hordeum chilense Roem. et Schultz. is a diploid wild barley native to Chile and Argentina. The high crossability of this species with other members of the Triticeae tribe promoted the development of the new species × Tritordeum Ascherson et Graebner. Hexaploid tritordeum was developed from the hybrid derived from the cross between H. chilense (used as female parent) and durum wheat. The interest of H. chilense is based on the presence of traits potentially useful for wheat breeding, including high endosperm carotenoid content, septoria tritici blotch resistance and abiotic stress tolerance. Besides, the variability at cytoplasm level is also important in this species. The development of common wheat–H. chilense alloplasmic lines (nucleus from wheat and cytoplasm from H. chilense) results in fertile or male sterile genotypes, depending on the accession donating the cytoplasm. Furthermore, these alloplasmic lines constitute an ideal system for deepening our knowledge on nuclear–cytoplasm interactions. In conclusion, H. chilense is an interesting source of variability for wheat breeding.

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