scholarly journals Genetic Structure of Phaeosphaeria nodorum Populations in the North-Central and Midwestern United States

2008 ◽  
Vol 98 (1) ◽  
pp. 101-107 ◽  
Author(s):  
T. B. Adhikari ◽  
S. Ali ◽  
R. R. Burlakoti ◽  
P. K. Singh ◽  
M. Mergoum ◽  
...  
Keyword(s):  
United States ◽  
Genetic Structure ◽  
Genetic Differentiation ◽  
Winter Wheat ◽  
North Dakota ◽  
Wheat Cultivars ◽  
Soft Red Winter Wheat ◽  
Phaeosphaeria Nodorum ◽  
Central United States ◽  
Red Winter Wheat

Stagonospora nodorum blotch, caused by Phaeosphaeria nodorum, is considered one of the most destructive foliar diseases of wheat in the United States. However, relatively little is known about the population biology of this fungus in the major wheat-growing regions of the central United States. To rectify this situation, 308 single-spore isolates of P. nodorum were analyzed from 12 populations, five from hard red spring wheat cultivars in Minnesota and North Dakota and seven from soft red winter wheat in Indiana and Ohio. The genetic structure of the sampled populations was determined by analyzing polymorphisms at five microsatellite or simple-sequence repeat (SSR) loci and the mating type locus. Although a few clones were identified, most P. nodorum populations had high levels of gene (HS = 0.175 to 0.519) and genotype (D = 0.600 to 0.972) diversity. Gene diversity was higher among isolates collected from spring wheat cultivars in North Dakota and Minnesota (mean HS = 0.503) than in those from winter wheat cultivars in Indiana and Ohio (HS = 0.269). Analyses of clone-corrected data sets showed equal frequencies of both mating types in both regional and local populations, indicating that sexual recombination may occur regularly. However, significant gametic disequilibrium occurred in three of the four populations from North Dakota, and there was genetic differentiation both within and among locations. Genetic differentiation between the hard red spring and soft red winter wheat production regions was moderate (FST = 0.168), but whether this is due to differences in wheat production or to geographical variation cannot be determined. These results suggest that sexual reproduction occurs in P. nodorum populations in the major wheat-growing regions of the central United States, and that geographically separated populations can be genetically differentiated, reflecting either restrictions on gene flow or selection.

scholarly journals Physiologic Specialization of Puccinia triticina on Wheat in the United States in 2016

Plant Disease ◽  
2018 ◽  
Vol 102 (6) ◽  
pp. 1066-1071 ◽  
Author(s):  
J. A. Kolmer ◽  
M. E. Hughes
Keyword(s):  
United States ◽  
Winter Wheat ◽  
Leaf Rust ◽  
Great Plains ◽  
Puccinia Triticina ◽  
The United States ◽  
Wheat Cultivars ◽  
Soft Red Winter Wheat ◽  
Winter Wheat Cultivars ◽  
Red Winter Wheat

Leaves of wheat infected with the leaf rust fungus Puccinia triticina were obtained from farm fields and breeding plots at experimental stations in the Great Plains, Ohio River Valley, and southeastern states in 2016 in order to identify virulence phenotypes prevalent in the United States in different wheat-growing regions. In total, 496 single uredinial isolates derived from the leaf rust collections were tested for virulence to 20 lines of Thatcher wheat that differ for single leaf rust resistance genes. In total, 71 virulence phenotypes were described in the United States in 2016. The three most common virulence phenotypes across the United States were MBTNB, MBDSD, and TNBJJ. Phenotype MBTNB is virulent to Lr11, and was most common in the soft red winter wheat region of the southeastern states and Ohio Valley. Phenotype MBDSD is virulent to Lr17 and Lr39, and was most common in the hard red winter wheat area of the southern Great Plains. Phenotype TNBJJ is virulent to Lr24 and Lr39, which are present in the hard red winter wheat cultivars. The P. triticina population in the United States was characterized by two major regional groups of virulence phenotypes in the Great Plains region where hard red winter and spring wheat cultivars are grown, and in the southeastern states and Ohio Valley region where soft red winter wheat cultivars are grown. Isolates from New York State differed the most for virulence compared with the other two major regions.

scholarly journals Physiologic Specialization of Puccinia triticina on Wheat in the United States in 2012

Plant Disease ◽  
2014 ◽  
Vol 98 (8) ◽  
pp. 1145-1150 ◽  
Author(s):  
J. A Kolmer ◽  
M. E. Hughes
Keyword(s):  
United States ◽  
Winter Wheat ◽  
Leaf Rust ◽  
Great Plains ◽  
Puccinia Triticina ◽  
The United States ◽  
Wheat Cultivars ◽  
Soft Red Winter Wheat ◽  
Hard Red Winter Wheat ◽  
Red Winter Wheat

Collections of Puccinia triticina were obtained from rust-infected leaves provided by cooperators throughout the United States and from wheat fields and breeding plots by United States Department of Agriculture–Agricultural Research Service personnel and cooperators in the Great Plains, Ohio River Valley, southeastern states, and Washington State and Idaho in order to determine the virulence of the wheat leaf rust population in 2012. Single uredinial isolates (501 in total) were derived from the collections and tested for virulence phenotype on 20 lines of ‘Thatcher’ wheat that are near-isogenic for leaf rust resistance genes. In 2012, 74 virulence phenotypes were described in the United States. Virulence phenotypes TNBGJ, TCRKG, and MBTNB were the three most common phenotypes. Phenotype TNBGJ is virulent to Lr39/41 and was widely distributed throughout the hard red winter wheat region of the Great Plains. Phenotype TCRKG is virulent to Lr11, Lr18, and Lr26 and was found mostly in the soft red winter wheat region in the eastern United States. Phenotype MBTNB is virulent to Lr11 and was also found mostly in the soft red winter wheat region. The frequency of isolates with virulence to Lr39/41, which is present in many hard red winter wheat cultivars in the Great Plains region, continued to increase. Isolates with virulence to Lr21, which is present in many hard red spring wheat cultivars, also continued to increase in frequency in the northern Great Plains region.

scholarly journals Physiologic Specialization of Puccinia triticina on Wheat in the United States in 2015

Plant Disease ◽  
2017 ◽  
Vol 101 (12) ◽  
pp. 1968-1973 ◽  
Author(s):  
J. A Kolmer ◽  
M. E. Hughes
Keyword(s):  
United States ◽  
Winter Wheat ◽  
Leaf Rust ◽  
Great Plains ◽  
Puccinia Triticina ◽  
The United States ◽  
Wheat Cultivars ◽  
Soft Red Winter Wheat ◽  
Winter Wheat Cultivars ◽  
Red Winter Wheat

Leaves of wheat infected with the leaf rust fungus, Puccinia triticina, were obtained from farm fields and breeding plots at experimental stations in the Great Plains, Ohio River Valley, and southeastern states in 2015 in order to identify virulence phenotypes prevalent in the United States in different wheat growing regions. A total of 526 single uredinial isolates derived from the leaf rust collections were tested for virulence to 20 lines of Thatcher wheat that differ for single leaf rust resistance genes. A total of 60 virulence phenotypes were described in the United States in 2015. The three most common virulence phenotypes across the United States were MBDSD, MBTNB, and TBBGS. Phenotype MBDSD is virulent to Lr17, Lr37, and Lr39, and was most common in the hard red winter wheat area of the southern Great Plains. Phenotype MBTNB is virulent to Lr11, and was most common in the soft red winter wheat region of the southeastern states and Ohio Valley. Phenotype TBBGS is virulent to Lr39, which is present in the hard red winter wheat cultivars, and Lr21, which is present in the hard red spring wheat cultivars. The P. triticina population in the United States was characterized by two major regional groups of virulence phenotypes in the Great Plains region where hard red winter and spring wheat cultivars are grown, and in the southeastern states and Ohio Valley region where soft red winter wheat cultivars are grown.

Soft Red Winter Wheat (Triticum aestivum) Response to Dicamba and Dicamba Plus 2,4-D

1989 ◽  
Vol 3 (1) ◽  
pp. 67-71 ◽  
Author(s):  
Jill Schroeder ◽  
Philip A. Banks
Keyword(s):  
Triticum Aestivum ◽  
Winter Wheat ◽  
Grain Yield ◽  
Field Experiments ◽  
Wheat Cultivars ◽  
Soft Red Winter Wheat ◽  
Winter Wheat Cultivars ◽  
Red Winter Wheat

Soft red winter wheat cultivars were evaluated in field experiments in Georgia for tolerance to dicamba alone and mixed with 2,4-D. Treatments reduced ‘Florida 302’ yield more than ‘Florida 301’ or ‘Coker 983’ at Tifton in 1986. Mid-tillering Florida 302 wheat was more sensitive to treatment than fully tillered wheat. In 1987, dicamba plus 2,4-D applied at mid-tillering reduced yields of all cultivars in Watkinsville. Injury and yield reductions occurred primarily when mid-tiller treatments were applied to wheat that was planted 10 or 21 days later than recommended at Tifton or Watkinsville, respectively. When applied according to labeling, dicamba or dicamba plus 2,4-D use in Georgia soft red winter wheat can reduce grain yield.

Preharvest Sprouting Tolerance in Current Soft Red Winter Wheat Cultivars

Crop Science ◽  
2010 ◽  
Vol 50 (4) ◽  
pp. 1449-1457 ◽  
Author(s):  
K. R. Hughes ◽  
C. A. Griffey ◽  
D. J. Parrish ◽  
W. E. Barbeau ◽  
E. Souza ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Preharvest Sprouting ◽  
Wheat Cultivars ◽  
Soft Red Winter Wheat ◽  
Winter Wheat Cultivars ◽  
Red Winter Wheat

Genetic Yield Improvement in Soft Red Winter Wheat in the Eastern United States from 1919 to 2009

Crop Science ◽  
2012 ◽  
Vol 52 (5) ◽  
pp. 2097-2108 ◽  
Author(s):  
Andrew J. Green ◽  
G. Berger ◽  
C. A. Griffey ◽  
R. Pitman ◽  
W. Thomason ◽  
...  
Keyword(s):  
United States ◽  
Winter Wheat ◽  
Eastern United States ◽  
Yield Improvement ◽  
Soft Red Winter Wheat ◽  
Red Winter Wheat

scholarly journals Physiologic Specialization of Puccinia triticina on Wheat in the United States in 2010

Plant Disease ◽  
2012 ◽  
Vol 96 (8) ◽  
pp. 1216-1221 ◽  
Author(s):  
J. A. Kolmer ◽  
D. L. Long ◽  
M. E. Hughes
Keyword(s):  
United States ◽  
Winter Wheat ◽  
Leaf Rust ◽  
Agricultural Research ◽  
Puccinia Triticina ◽  
The United States ◽  
United States Department ◽  
Eastern United States ◽  
Soft Red Winter Wheat ◽  
Red Winter Wheat

Collections of Puccinia triticina were obtained from rust-infected leaves provided by cooperators throughout the United States and from wheat fields and breeding plots by United States Department of Agriculture–Agricultural Research Service personnel and cooperators in the Great Plains, Ohio River Valley, southeastern states, Oregon, and Washington State in order to determine the virulence of the wheat leaf rust population in 2010. Single uredinial isolates (537 total) were derived from the collections and tested for virulence phenotype on 19 lines of ‘Thatcher’ wheat and a winter wheat line that are near-isogenic for 20 leaf rust resistance genes. In 2010, 38 virulence phenotypes were described in the United States. Virulence phenotypes MLDSD, TDBJG, and TCRKG were the three most common phenotypes. Phenotype MLDSD is virulent to Lr17 and Lr39/Lr41 and was widely distributed throughout the United States. Phenotype TDBJG is virulent to Lr24 and was found in both the soft red winter wheat and hard red winter wheat regions. Phenotype TCRKG is virulent to Lr11, Lr18, and Lr26 and was found mostly in the soft red winter wheat region in the eastern United States. Virulence to Lr21 was found for the first time in North America in isolates collected from spring wheat cultivars in North Dakota and Minnesota.

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