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 triticina isolates 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.

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 triticina on isolines of Thatcher wheat.
Fig. 3.  Teliospores of Puccinia triticina.	Fig. 4.  Life cycle of Puccinia triticina.
Fig. 5.  Microsatellite (single sequence repeat) alleles of Puccinia triticina isolates from common and durum wheat.

Publications available in pdf format

2008 

• Analysis of the Lr34/Yr18 rust resistance region in wheat germplasm.
• Wheat leaf rust caused by Puccinia triticina.
• Physiologic specialization of Puccinia triticina on 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 triticina on 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 triticina from 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 triticina from durum wheat.
• Early research on the genetics of Puccinia graminis and stem rust resistance in wheat in Canada and the United States.
• Genetic differentiation of Puccinia triticina populations 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 triticina on wheat in the United States in 2004.
  

2005

• PCR markers for Triticum speltoides leaf rust resistance gene Lr51 and 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/Yr18 genes 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 triticina on 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 triticina on 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-Sr38 cluster of rust resistance genes and their use to develop isogenic hard red spring wheat lines.
• Physiologic specialization of Puccinia triticina on wheat in the United States in 2001.
• Postulation of leaf rust resistance genes in selected soft red winter wheats.
  

2002

• Physiologic specialization of Puccinia triticina on 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 triticina in the south Atlantic states in 1999.
  

2001

• Molecular polymorphism and virulence phenotypes of the wheat leaf rust fungus Puccinia triticina in Canada.
• Simple inheritance of partial resistance to leaf rust in two wheat cultivars.
• Physiologic specialization of Puccinia triticina in Canada in 1998.
  

2000

• Virulence and molecular polymorphism in international collections of the wheat leaf rust fungus Puccinia triticina.
  

1999

• Virulence dynamics, phenotypic diversity, and virulence complexity in two populations of Puccinia triticina in Canada from 1987 to 1997.
• Physiologic specialization of Puccinia triticina in 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 recondita f. sp. tritici isolates 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

• Genetics of resistance to wheat leaf rust.
  

1995 

• Virulence and molecular polymorphism in Puccinia recondita f. sp. tritici in Canada.

Publications by CDL staff available in pdf format