Breeding barley for durable resistance to net and spot forms of net blotch

2021 ◽  
pp. 567-586
Author(s):  
Jerome D. Franckowiak ◽  
◽  
Gregory J. Platz ◽  
Keyword(s):  
Population Dynamics ◽  
Molecular Markers ◽  
Durable Resistance ◽  
Pyrenophora Teres ◽  
Net Blotch ◽  
Net Form Net Blotch

This chapter focuses on breeding barley for durable resistance to net and spot forms of net blotch. It starts by reviewing how Pyrenophora teres f. teres can cause net form net blotch. The chapter then goes on to examine the molecular markers that can be identified to provide resistances to net form net blotch. A section on the population dynamics of barley–P. teres f. teres interactions is also provided. The chapter also reviews how breeding crops with specific genes can help to create durable resistance to net form blotch. It moves on to discuss how Pyrenophora teres Drechs. f. maculata can cause spot form net blotch and how identifying specific molecular markers can help provide resistance to this form of net blotch. The chapter concludes by highlighting the importance of combining durable resistance to both forms of net blotch.

scholarly journals Virulence Profile and Genetic Structure of a North Dakota Population of Pyrenophora teres f. teres, the Causal Agent of Net Form Net Blotch of Barley

2012 ◽  
Vol 102 (5) ◽  
pp. 539-546 ◽  
Author(s):  
Z. H. Liu ◽  
S. Zhong ◽  
A. K. Stasko ◽  
M. C. Edwards ◽  
T. L. Friesen
Keyword(s):  
North Dakota ◽  
Gene Diversity ◽  
Random Mating ◽  
Common Source ◽  
Pyrenophora Teres ◽  
Net Blotch ◽  
Seedling Resistance ◽  
Wide Range ◽  
Significant Difference ◽  
Net Form Net Blotch

A Pyrenophora teres f. teres population in North Dakota was analyzed for virulence variation and genetic diversity using 75 monospore isolates that were collected across a 4-year period (2004 to 2007) from two North Dakota State University agricultural experiment stations at Fargo and Langdon. Pathogenicity tests by inoculation onto 22 barley differential lines at seedling stage revealed 49 pathotypes, indicating a wide range of pathogenic diversity. Two-way analysis of variance of disease ratings revealed a significant difference in the virulence among isolates and in the resistance among barley lines, as well as in the interactions between the two. ‘CI5791’, ‘Algerian’, and ‘Heartland’ were three barley lines showing a high level of seedling resistance to all North Dakota isolates tested; however, many previously reported resistance genes have been overcome. Forty multilocus genotypes were identified from this set of isolates by genotyping at 13 simple-sequence repeat loci. High percentages of clonal cultures were detected in the samplings from 2005 and 2007 in Fargo and 2005 in Langdon. Using a clone-corrected sample set, the mean gene diversity (h) was estimated to be 0.58, approximately the same for both locations. The calculated Wright's FST value is small (0.11) but was significantly >0, indicating a significant differentiation between the Fargo and Langdon populations. In the gametic disequilibrium test, only 3 of 78 possible pairwise comparisons over all isolates showed significant (P < 0.05) nonrandom association, suggesting a random mating mode. Our results suggest that the populations from the two locations are derived from a common source and undergo frequent recombination. This research provides important information for barley breeders regarding development and deployment of cultivars with resistance to net form net blotch in this region.

Mapping of barley susceptibility/resistance QTL against spot form net blotch caused by Pyrenophora teres f. maculata using RIL populations

2019 ◽  
Vol 132 (7) ◽  
pp. 1953-1963 ◽  
Author(s):  
Prabin Tamang ◽  
Jonathan K. Richards ◽  
Abdullah Alhashal ◽  
Roshan Sharma Poudel ◽  
Richard D. Horsley ◽  
...  
Keyword(s):  
Pyrenophora Teres ◽  
Net Blotch ◽  
Resistance Qtl

Genetic analysis of a worldwide barley collection for resistance to net form of net blotch disease (Pyrenophora teres f. teres)

2019 ◽  
Vol 132 (9) ◽  
pp. 2633-2650 ◽  
Author(s):  
Fluturë Novakazi ◽  
Olga Afanasenko ◽  
Anna Anisimova ◽  
Gregory J. Platz ◽  
Rod Snowdon ◽  
...  
Keyword(s):  
Genetic Analysis ◽  
Pyrenophora Teres ◽  
Net Blotch

SOURCES OF RESISTANCE IN BARLEY TO PYRENOPHORA TERES

1965 ◽  
Vol 45 (2) ◽  
pp. 189-193 ◽  
Author(s):  
K. W. Buchannon ◽  
W. C. McDonald
Keyword(s):  
North Dakota ◽  
Quality Characteristics ◽  
Seedling Stage ◽  
Malting Quality ◽  
Western Canada ◽  
Pyrenophora Teres ◽  
Net Blotch ◽  
Sources Of Resistance ◽  
Highly Pathogenic ◽  
Resistant Varieties

The reaction to infection by Pyrenophora teres Drechs., the incitant of net blotch of barley, was determined for 6,174 varieties in the U.S.D.A. World Barley Collection. Forty varieties, seventeen of them from Ethiopia, were resistant in the seedling stage to a highly pathogenic strain of the fungus prevalent in Western Canada and to composites of isolates from Manitoba, Saskatchewan, Alberta, Ontario, North Dakota, California, and Mexico. They were also resistant in the field at three locations in Western Canada. Agronomic and malting quality characteristics for the resistant varieties were also recorded.

RFLP mapping of a gene in barley conferring resistance to net blotch (Pyrenophora teres)

Euphytica ◽  
1996 ◽  
Vol 91 (2) ◽  
pp. 229-234
Author(s):  
Andreas Graner ◽  
Bärbel Foroughi-Wehr ◽  
Andy Tekauz
Keyword(s):  
Rflp Mapping ◽  
Pyrenophora Teres ◽  
Net Blotch

Epidemiology and control of spot form of net blotch (Pyrenophora teres f. maculata) of barley: a review

2009 ◽  
Vol 60 (4) ◽  
pp. 303 ◽  
Author(s):  
Mark S. McLean ◽  
Barbara J. Howlett ◽  
Grant J. Hollaway
Keyword(s):  
Cost Effective ◽  
Pyrenophora Teres ◽  
Net Blotch ◽  
Stubble Retention ◽  
Resistant Varieties ◽  
Cost Effective Method ◽  
Barley Germplasm ◽  
Grain Yield And Quality ◽  
The 1960S ◽  
And Control

Spot form of net blotch (SFNB), caused by the fungus Pyrenophora teres f. maculata, was first described in Denmark in the 1960s and is now a prevalent foliar disease of barley in many countries. This disease should be controlled as a separate disease-causing organism from the net form of net blotch (NFNB), which is caused by P. teres f. teres. The increase in prevalence of SFNB is primarily due to stubble retention and cultivation of susceptible varieties, which have resulted in increased inoculum. Infected barley stubble is the primary inoculum source for SFNB, producing both asexual spores (conidia) and sexual spores (ascospores) from pseudothecia. Spot form of net blotch causes significant losses in grain yield and quality in situations where inoculum is present, susceptible varieties are cultivated, and where the climate is cool and moist. Cultivation of resistant varieties is the most cost-effective method for control of SFNB and more than 12 different resistance sources have been identified in barley germplasm and wild barley relatives. The resistance loci of 11 of these have been mapped. Control of SFNB can also be achieved with application of foliar fungicides, crop rotation, and stubble destruction.

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