Population genetics of the wheat leaf rust fungus, Puccinia triticina in Central Asia
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Transcript of Population genetics of the wheat leaf rust fungus, Puccinia triticina in Central Asia
Population genetics of the Population genetics of the wheat leaf rust fungus, wheat leaf rust fungus,
Puccinia triticinaPuccinia triticinain Central Asiain Central Asia
J. A. KolmerJ. A. Kolmer
M. E. OrdonezM. E. Ordonez
USDA-ARS USDA-ARS
Cereal Disease LaboratoryCereal Disease Laboratory
University of Minnesota -St. PaulUniversity of Minnesota -St. Paul
Leaf Rust CollectionsLeaf Rust Collections
Collections from 2002, Collections from 2002, 2004, 20052004, 2005
A. A. Morgounov - CIMMYT, Morgounov - CIMMYT, Almaty KazakhstanAlmaty Kazakhstan
137 isolates tested for 137 isolates tested for virulence - 99 for SSRvirulence - 99 for SSR
Caucasus - (Azb.,Geo. Caucasus - (Azb.,Geo. Arm.) 13 Uzbekistan - 7 Arm.) 13 Uzbekistan - 7
Tajikistan-Kyrgyzstan -15 Tajikistan-Kyrgyzstan -15 S. Kazakhstan - 39 S. Kazakhstan - 39 N. Kazakhstan- 25 N. Kazakhstan- 25 N. America-16 N. America-16
Durum - 2Durum - 2
Clone corrected within Clone corrected within populations populations
(race/SSR genotype)(race/SSR genotype) 20 differentials - 23 SSR 20 differentials - 23 SSR
lociloci
Super highway - Kazakhstan
Virulence and SSR DiversityVirulence and SSR Diversity
Cauc.Cauc. N. Kaz.N. Kaz. S. KazS. Kaz Tjk-KygTjk-Kyg UzbekUzbek N. Am.N. Am.
No. No. isolatesisolates 1313 2525 3939 1515 77 1616
No. No. racesraces 1212 2121 3737 1515 77 1616
No. SSR No. SSR
genotypgenotypee 1111 2121 3434 99 55 1414
ShannoShannon/ n/ Ln(N)Ln(N) 0.920.92 0.930.93 0.940.94 0.700.70 0.760.76 0.930.93
Tjk-Kyg-Uzb.-Tjk-Kyg-Uzb.-Caucasus not sig. Caucasus not sig. differentiated differentiated
S. Kaz - N. Kaz.S. Kaz - N. Kaz.not sig. not sig. differentiateddifferentiated
Differentiation Statistics (Phi) of Pair-wise Populations - Virulence phenotypes
Neighbor joining
Tjk-Kyg-Uzb - Caucasus not signif. differentiated
S. Kaz - N. Kaz. not signif. differentiated
0.82 correlation with virulence tree
Differentiation (Fst) Statistics of Pair-wise Populations SSR Genotypes
Neighbor joining
-Central Asia1 Avir Lr2a Vir Lr2c24Most from Cauc-Tjk-Kry-Uzb.
3 Vir Lr2a Vir Lr2cMost from S.+ N.Kazakhstan
-North America5 Avir Lr2a Vir Lr2c7 Vir Lr2a Lr2c Avir Lr2a Lr2c
-Durum 6 Avir. to almost all Lr genes
Individual Isolates SSR Allele Variation
Neighbor joining
Central AsiaCentral AsiaP. triticinaP. triticina populations populations
Two distinct Two distinct regional regional populations - populations - mountain barrier mountain barrier
Limited migration Limited migration between regions - between regions - very few SSR-very few SSR-virulence virulence genotypes in genotypes in commoncommon
Strong relationship Strong relationship between virulence between virulence and SSR genotypesand SSR genotypes
Come to Kazakhstan!!!
Population Genetics of Population Genetics of P. triticina - P. triticina - Future GoalsFuture Goals
Describe world-wide Describe world-wide populations populations
20 Tc line differentials20 Tc line differentials
23 SSR loci23 SSR loci
• North America, Central North America, Central Asia, Middle East, Asia, Middle East,
South America, EuropeSouth America, Europe
• Determine genetic Determine genetic relationships between relationships between populations - populations -
(MCDS - USA- S. America)(MCDS - USA- S. America)