James A Kolmer
(Jim)
Plant Pathologist
Plant Pathologist
Research Projects:
- Virulence and race dynamics of wheat leaf rust (Puccinia triticina) in the United States
- Virulence and molecular (microsatellite-simple sequence repeat unit) characterization of U.S. and world-wide populations of Puccinia triticina
- Characterization of Puccinia triticinaisolates with different telial hosts
- Genetics of leaf rust resistance in U.S. spring and winter wheat cultivars
- Mapping of leaf rust resistance genes derived from wheat cultivars with durable resistance
- Development of isogenic wheat lines with leaf rust resistance genes
- Postulation of leaf rust resistance genes in U.S. wheat cultivars and advanced germplasm lines.
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| Fig. 1. Puccinia triticina(wheat leaf rust) infection types on flag leaves of Thatcher (susceptible) and Thatcher + Lr12 (resistant), Thatcher + Lr13 (resistant) and Thatcher + Lr34 (resistant). | Fig. 2. Seedling infection types of Puccinia triticinaon isolines of Thatcher wheat. |
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Fig. 3. Teliospores of Puccinia triticina. |
Fig. 4. Life cycle of Puccinia triticina. |
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| Fig. 5. Microsatellite (single sequence repeat) alleles of Puccinia triticinaisolates from common and durum wheat. |
Leaf rust resistance gene postulation in current U.S. wheat cultivars
Publications available in pdf format
2017
2016
2015
2014
2013
- Physiologic specialization of Puccinia triticina on wheat in the United States in 2011.
- Leaf rust of wheat: Pathogen biology, variation and host resistance.
2012
- Genetic differentiation of wheat leaf rust fungus Puccinia triticina in Europe.
- Leaf rust resistance in selected Uruguayan common wheat cultivars with early maturity.
2011
- Genetic differentiation of Puccinia triticina populations in the Middle East and genetic similarity with populations in central Asia.
- Physiologic specialization of Puccinia triticina on wheat in the United States in 2009.
- Expression of a Thatcher wheat adult plant stem rust resistance QTL on chromosome arm 2BL is enhanced by Lr34.
2010
- Association mapping of leaf rust response in durum wheat.
- Chromosome location, linkage with simple sequence repeat markers, and leaf rust resistance conditioned by gene Lr63 in wheat.
- Physiologic specialization of Puccinia triticina on wheat in the United States
in 2008. - Genetics of leaf rust resistance in the soft red winter wheat cultivars Coker 9663 and Pioneer 26R61.
- Virulence phenotypes and molecular genotypes in collections of Puccinia triticina from Italy.
- Genetic differentiation within the Puccinia triticina population in South America and comparison with the North American population suggests common ancestry and intercontinental migration.
2009
- Diseases which challenge global wheat production - the wheat rusts.
- The rust fungi.
- Identification of novel QTLs for seedling and adult plant leaf rust resistance in a wheat doubled haploid population.
- Genetics of leaf rust resistance in the soft red winter wheat 'Caldwell'.
- Differentiation of molecular genotypes and virulence phenotypes of Puccinia triticina from common wheat in North America.
- Physiologic specialization of Puccinia triticina on wheat in the United States in 2007.
2008
- Analysis of the Lr34/Yr18 rust resistance region in wheat germplasm.
- Wheat leaf rust caused by Puccinia triticina.
- Physiologic specialization of Puccinia triticinaon wheat in the United States in 2006.
- Genetics of leaf rust resistance in Brambling wheat.
- Inheritance of leaf rust resistance in the CIMMYT wheat Weebill 1.
- Genetics of stem rust resistance in the spring wheat cultivar Thatcher and the enhancement of stem rust resistance by Lr34. Stem rust resistance in TcLr34.
2007
- Wheat leaf and stem rust in the United States.
- Resistance of Sharon goatgrass (Aegilops sharonensis) to fungal diseases of wheat.
- Physiologic specialization of Puccinia triticinaon wheat in the United States in 2005.
- Development of simple sequence repeat markers for the plant pathogenic rust fungus Puccinia triticina.
- Virulence phenotypes of a worldwide collection of Puccinia triticinafrom durum wheat.
- Genetics of leaf rust resistance in three Americano landrace-derived wheat cultivars from Uruguay.
- Simple sequence repeat diversity of a worldwide collection of Puccinia triticinafrom durum wheat.
- Early research on the genetics of Puccinia graminisand stem rust resistance in wheat in Canada and the United States.
- Genetic differentiation of Puccinia triticinapopulations in Central Asia and the Caucasus.
2006
- Genetics of leaf rust resistance in the spring wheat cultivars 'Ivan' and 'Knudson' spring wheat.
- Physiologic specialization of Puccinia triticinaon wheat in the United States in 2004.
2005
- PCR markers for Triticum speltoidesleaf rust resistance gene Lr51and their use to develop isogenic hard red spring wheat lines.
- Molecular characterization of durum and common wheat recombinant lines carrying leaf rust resistance (Lr19) and yellow pigment (Y) genes from Lophopyrum ponticum.
- Powdery mildew resistance and Lr34/Yr18genes for durable resistance to leaf and stripe rust cosegregate at a locus on the short arm of chromosome 7D of wheat.
- Registration of 'Oklee' wheat.
- Rust control in glyphosate tolerant wheat following application of herbicide glyphosate.
- Physiologic specialization of Puccinia triticinaon wheat in the United States in 2003.
- Tracking wheat rust on a continental scale.
- Genetics of leaf rust resistance in spring wheat cultivars Alsen and Norm.
- Wheat Rusts in the United States in 2004.
- Margaret Newton: Pioneering Cereal Rust Researcher.
2004
- Physiologic specialization of Puccinia triticinaon wheat in the United States in 2002.
- Characterization of leaf rust resistance in hard red spring wheat cultivars.
2003
- PCR assays for the Lr37-Yr17-Sr38cluster of rust resistance genes and their use to develop isogenic hard red spring wheat lines.
- Physiologic specialization of Puccinia triticinaon wheat in the United States in 2001.
- Postulation of leaf rust resistance genes in selected soft red winter wheats.
2002
- Physiologic specialization of Puccinia triticinaon wheat in the United States in 2000.
- Inheritance of leaf rust resistance in the wheat cultivars AC Majestic, AC Splendor, and AC Karma.
- Virulence phenotypes of Puccinia triticinain the south Atlantic states in 1999.
2001
- Molecular polymorphism and virulence phenotypes of the wheat leaf rust fungus Puccinia triticinain Canada.
- Simple inheritance of partial resistance to leaf rust in two wheat cultivars.
- Physiologic specialization of Puccinia triticinain Canada in 1998.
2000
1999
- Virulence dynamics, phenotypic diversity, and virulence complexity in two populations of Puccinia triticinain Canada from 1987 to 1997.
- Physiologic specialization of Puccinia triticinain Canada in 1997.
1998
- Genetics of stem rust resistance in wheat cvs. Pasqua and AC Taber.
- Molecular and virulence diversity and linkage disequilibria in asexual and sexual populations of the wheat leaf rust fungus, Puccinia recondita.
1997
- Virulence in Puccinia reconditaf. sp. triticiisolates from Canada to genes for adult-plant resistance to wheat leaf rust.
- Genetics of leaf rust resistance in Canadian spring wheats AC Domain and AC Taber.
- Inheritance of leaf rust resistance in wheat cultivars Grandin and CDC Teal.
1996
1995
Publications by CDL staff available in pdf format
