Wheat Breeding for Resistance to Leptosphaeria Nodorum, The Cause of Septoria Nodorum Blotch in Croatia

1993 ◽  
pp. 331-331
Author(s):  
B. Korić
Keyword(s):  
Wheat Breeding ◽  
Septoria Nodorum ◽  
Breeding For Resistance ◽  
Leptosphaeria Nodorum ◽  
Septoria Nodorum Blotch

scholarly journals GWAS analysis reveals distinct pathogenicity profiles of Australian Parastagonospora nodorum isolates and identification of marker-trait-associations to septoria nodorum blotch

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Huyen T. T. Phan ◽  
Eiko Furuki ◽  
Lukas Hunziker ◽  
Kasia Rybak ◽  
Kar-Chun Tan
Keyword(s):  
Wheat Breeding ◽  
Snp Markers ◽  
Septoria Nodorum ◽  
Seedling Resistance ◽  
Association Analyses ◽  
Septoria Nodorum Blotch ◽  
Parastagonospora Nodorum ◽  
First Time

AbstractThe fungus Parastagonospora nodorum is the causal agent of septoria nodorum leaf blotch (SNB) and glume blotch which are common in many wheat growing regions in the world. The disease is complex and could be explained by multiple interactions between necrotrophic effectors secreted by the pathogen and matching susceptibility genes in wheat. An Australian P. nodorum population was clustered into five groups with contrasting properties. This study was set to identify their pathogenicity profiles using a diverse wheat panel of 134 accessions which are insensitive to SnToxA and SnTox1 in both in vitro and in vivo conditions. SNB seedling resistance/susceptibility to five representative isolates from the five clusters, responses to crude culture-filtrates (CFs) of three isolates and sensitivity to SnTox3 semi-purified effector together with 11,455 SNP markers have been used for linkage disequilibrium (LD) and association analyses. While quantitative trait loci (QTL) on 1D, 2A, 2B, 4B, 5B, 6A, 6B, 7A, 7D chromosomes were consistently detected across isolates and conditions, distinct patterns and isolate specific QTL were also observed among these isolates. In this study, SnTox3–Snn3-B1 interaction for the first time in Australia and SnTox3–Snn3-D1 interaction for the first time in bread wheat were found active using wild-type isolates. These findings could be due to new SnTox3 haplotype/isoform and exotic CIMMYT/ICARDA and Vavilov germplasm used, respectively. This study could provide useful information for dissecting novel and different SNB disease components, helping to prioritise research targets and contributing valuable information on genetic loci/markers for marker-assisted selection in SNB resistance wheat breeding programme.

A single gene controls resistance to septoria nodorum blotch in the Aegilops tauschii accession AUS21712

2001 ◽  
Vol 52 (12) ◽  
pp. 1403 ◽  
Author(s):  
N. E. A. Murphy ◽  
R. Loughman ◽  
R. E. Wilson ◽  
E. S. Lagudah ◽  
R. Appels ◽  
...  
Keyword(s):  
Single Gene ◽  
Aegilops Tauschii ◽  
Wheat Breeding ◽  
Septoria Nodorum ◽  
Genetics Of Resistance ◽  
Susceptible Parent ◽  
Tauschii Accession ◽  
Resistant Parent ◽  
Septoria Nodorum Blotch ◽  
Potential Source

A potential source of resistance to septoria nodorum blotch had been identified in an accession of the wild wheat, Aegilops tauschii. A cross was made between the resistant Ae. tauschii accession, AUS21712, and a susceptible accession, CPI110889, to study the genetics of resistance. The parental accessions and the F1, F3, and F4 progeny were screened in the glasshouse as seedlings. The resistant parent took significantly longer to develop symptoms, developed significantly fewer lesions, and expressed significantly lower levels of disease than the susceptible parent. The F1 mean response for disease severity indicated resistance was dominant. The genotypic ratios generated from the screening of the F3 and F4 generations were not significantly different from the genotypic ratio expected for a single gene. The efficacy of the resistance and its simple genetic control in the Ae. tauschii accession AUS21712 means that the potential exists to use this Ae. tauschii resistance gene in a bread wheat breeding program.

scholarly journals A wheat chromosome 5AL region confers seedling resistance to both tan spot and Septoria nodorum blotch in two mapping populations

2019 ◽  
Vol 7 (6) ◽  
pp. 809-818 ◽  
Author(s):  
Wenjing Hu ◽  
Xinyao He ◽  
Susanne Dreisigacker ◽  
Carolina P. Sansaloni ◽  
Philomin Juliana ◽  
...  
Keyword(s):  
Wheat Chromosome ◽  
Tan Spot ◽  
Septoria Nodorum ◽  
Seedling Resistance ◽  
Septoria Nodorum Blotch ◽  
Mapping Populations

scholarly journals Development of knowledge about Septoria nodorum Berk. with regard to breeding wheat for tolerance or resistance. [German]

1982 ◽  
Vol 30 (1) ◽  
pp. 47-67
Author(s):  
A. Bronnimann
Keyword(s):  
Genetic Basis ◽  
Septoria Nodorum ◽  
Breeding Methods ◽  
Selection Methods ◽  
Leptosphaeria Nodorum ◽  
Current State ◽  
Variety Testing

This review of work on S. nodorum [Leptosphaeria nodorum] is presented under the following headings: (1) history, (2) epidemiology, (3) symptomatology and damage, (4) selection methods and variety testing, (5) genetic basis of tolerance, (6) breeding methods and (7) the assessment of the current state of Septoria prevention and of the prospects for further advances. The contribution of the late W. Feekes to this subject is emphasized. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Evaluation of Septoria Nodorum Blotch (SNB) Resistance in Glumes of Wheat (Triticum aestivum L.) and the Genetic Relationship With Foliar Disease Response

2021 ◽  
Vol 12 ◽  
Author(s):  
Michael G. Francki ◽  
Esther Walker ◽  
Christopher J. McMullan ◽  
W. George Morris
Keyword(s):  
Physical Map ◽  
Phenotypic Selection ◽  
Triticum Aestivum L ◽  
Phenotypic Correlation ◽  
Septoria Nodorum ◽  
Genotype By Environment Interactions ◽  
Genotype By Environment ◽  
Septoria Nodorum Blotch ◽  
Foliar Resistance ◽  
Genetic Mechanisms

Septoria nodorum blotch (SNB) is a necrotrophic disease of wheat prominent in some parts of the world, including Western Australia (WA) causing significant losses in grain yield. The genetic mechanisms for resistance are complex involving multiple quantitative trait loci. In order to decipher comparable or independent regulation, this study identified the genetic control for glume compared to foliar resistance across four environments in WA against 37 different isolates. High proportion of the phenotypic variation across environments was contributed by genotype (84.0% for glume response and 82.7% for foliar response) with genotype-by-environment interactions accounting for a proportion of the variation for both glume and foliar response (14.7 and 16.2%, respectively). Despite high phenotypic correlation across environments, most of the eight and 14 QTL detected for glume and foliar resistance using genome wide association analysis (GWAS), respectively, were identified as environment-specific. QTL for glume and foliar resistance neither co-located nor were in LD in any particular environment indicating autonomous genetic mechanisms control SNB response in adult plants, regulated by independent biological mechanisms and influenced by significant genotype-by- environment interactions. Known Snn and Tsn loci and QTL were compared with 22 environment-specific QTL. None of the eight QTL for glume or the 14 for foliar response were co-located or in linkage disequilibrium with Snn and only one foliar QTL was in LD with Tsn loci on the physical map. Therefore, glume and foliar response to SNB in wheat is regulated by multiple environment-specific loci which function independently, with limited influence of known NE-Snn interactions for disease progression in Western Australian environments. Breeding for stable resistance would consequently rely on recurrent phenotypic selection to capture and retain favorable alleles for both glume and foliar resistance relevant to a particular environment.

scholarly journals Host-pathogen interaction between spring wheat and Septoria nodorum with reference to resistance breeding

1985 ◽  
Vol 57 (1) ◽  
pp. 1-66
Author(s):  
Reijo Karjalainen
Keyword(s):  
Grain Yield ◽  
Spring Wheat ◽  
Wheat Breeding ◽  
Grain Weight ◽  
Septoria Nodorum ◽  
Spore Concentration ◽  
Screening Techniques ◽  
Host Pathogen Interaction ◽  
Host Pathogen ◽  
1000 Grain Weight

Host-pathogen interaction between spring wheat and Septoria nodorum Berk. with applications for wheat breeding were studied. Ultrastructure of interactions was studied using electron microscopic techniques. Following inoculation, conidia of S. nodorum germinate, form appressoria anda penetration peg which directly penetrates through the cell walls. It is suggested that most penetration attempts fail because of cellular defence reactions, formation of papillae and cell wall alterations. Inoculation with low spore concentration reduced grain yield of Hankkija’s Taava cultivar by 10 % and 1000-grain weight by 14 %. Inoculation with high spore concentration on large plots of Tähti cultivar reduced grain yield by 32 % and 1000-grain weight by 18 %. Inoculation with high spore concentration on normal breeding plots of Tähti cultivar reduced grain yield by 35 % and 1000-grain weight by 21 % and the grain yield of Kadett cultivar by 27 % and 1000-grain weight by 20 %. Inheritance studies on F2 progenies of spring wheat crosses involving susceptible and moderately or highly resistant parents suggest that heredity component of symptom expression is moderate level and breeding success depends mainly on efficient screening techniques. Resistance was associated with tallness in crosses, and cultivar trials suggest that resistance is positively associated with late maturation time. Field screening techniques based on small plots and artificial inoculation showed that the most resistant entries were wild Triticum species and late and tall cultivars. Seedling plant tests based on attached seedling leaves and detached leaves revealed easily the most resistant and most susceptible cultivars. The overall correlation between seedling tests and field tests was quite high. The results are discussed in relation to wheat breeding strategies for resistance to S. nodorum.

Les organes de reproduction de l'ascomycète Phaeosphaeria (Leptosphaeria) nodorum et de sa forme asexuée Septoria nodorum

1992 ◽  
Vol 70 (7) ◽  
pp. 1401-1408 ◽  
Author(s):  
P. Halama ◽  
A. Parguey-Leduc ◽  
L. Lacoste
Keyword(s):  
Key Words ◽  
Reproductive Organs ◽  
The Other ◽  
Stagonospora Nodorum ◽  
Septoria Nodorum ◽  
Asexual Stage ◽  
Leptosphaeria Nodorum ◽  
Phaeosphaeria Nodorum

The reproductive organs of one of the pathogens responsible for the septoria diseases of wheat were studied from cultures. There are two types of pycnidia for the asexual stage (one belongs to Septoria nodorum Berk. (=Stagonospora nodorum (Berk.) Castellani & Germano); the other is microconidial) and pseudothecia for the teleomorph: Phaeosphaeria nodorum (E. Müller) Hedjaroude (=Leptosphaeria nodorum E. Müller). The latter are differentiated from glomerular primordia, and their development is typical of an ascolocular pyrenomycete, with a perilocular layer generating descending pseudoparaphyses and periphyses lining the ostiolar cavity. The asci, with a "Jack-in-the-box" dehiscence, are bitunicate. Key words: Phaeosphaeria nodorum, Leptosphaeria, ontogeny and structure, pseudothecia, pycnidia.

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