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![Pleiotropic adult plant resistance (PAPR) genes
„ Lr34 [Syn.=Yr18=Sr57=Pm38=Ltn1=Sb1=Bdv1] chromosome 7DS
(leaf rust, yellow rust, stem rust, powdery mildew, leaf tip necrosis, spot blotch, barley yellow dwarf virus )
„ Lr46 [Syn.=Yr29=Sr58=Pm39=Ltn2=Ts?] chromosome 1BL
„ Lr67 [Syn.=Yr46=Sr55=Pm46=Ltn3] chromosome 4DL
„ Lr68 [yellow rust, powdery mildew and stem rust?] chromosome 7BL
„ Yr54 [leaf rust, powdery mildew and stem rust?] chromosome 2DL
Apav (susceptible)
Lr67
Lr68
Lr46
Lr34
Avocet (susceptible)
Formation of cell wall
appositions (instead of
hypersensitivity with
NBS-LRR type race-
specific genes)](https://image.slidesharecdn.com/2014-20bgri-20lan-20presentation-140423100609-phpapp01/85/Characterization-of-pleiotropic-adult-plant-resistance-loci-to-wheat-diseases-6-320.jpg)
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Characterization of pleiotropic adult plant resistance loci to wheat diseases
- 1. Characterization of pleiotropic adultplant resistance loci to wheat diseases Caixia Lan, Ravi P Singh, Sybil Herrera-Foessel, Julio Huerta-Espino, Bhoja R Basnet, Evans S Lagudah* * CSIRO Plant Industry, Australia
- 2. ► Introduction ► PAPR research inCIMMYT ► Breeding for PAPR in wheat ► Future plan Contents
- 3. Wheat major diseases Black(stem) rust Puccinia graminis Yellow (stripe) rust Puccinia striiformis Brown (leaf) rust Puccinia triticina Powdery mildew Blumeria graminis
- 4. Resistance loci forwheat diseases „ Seedling resistance gene (race-specific) and adult plant resistance gene (non-race specific) „ Resistance genes: 72 leaf rust, 63 stripe rust, 58 stem rust and 47 powdery mildew „ Resistance QTL: 80 for leaf rust, 140 stripe rust, 114 powdery mildew, stem rust?
- 5. “Boom-and-Bust”: Race-specific genes Year VarietyResistance genes Released Breakdown Race Country Bread Wheat: Yecora 70 Lr1, 13 1970 1973 ? Mexico Tanori 71 Lr13, 17 1971 1975 ? Mexico Jupateco 73 Lr17, 27+31 1973 1977 TBD/TM Mexico Genaro 81 Lr13, 26 1981 1984 TCB/TB Mexico Seri 82 Lr23, 26 1982 1985 TCB/TD Mexico Baviacora 92 Lr14b, 27+31 1992 1994 MCJ/SP Mexico Lovrin derived linesYr9 1971-1972 1985 CYR29 China Moro Yr10 ? 2011 ? Canada Milan Yr17 ? 2006 134 E16 A+ Australia Chuanmai 42 Yr24/26 2004 2010 V26 China Opata 85 Yr27 1985 1996 Mex96.11 Mexico Pastor Yr31 ? 2008 Mex08.13 Mexico Lovrin 10 Pm8 1970s 1990-1991 ? China Kavkaz Sr31 1980s 1998 Ug99 Uganda Durum Wheat: Altar 84 Lr72 1984 2001 BBG/BN Mexico Jupare 2001 Lr72, 27+31 2001 2007 BBG/BP Mexico Khapstein/ 9*LMPG and Vernal Sr13, Sr13+Sr9e ? 2009 TRTTF and JRCQC Ethiopia
- 6. Pleiotropic adult plantresistance (PAPR) genes „ Lr34 [Syn.=Yr18=Sr57=Pm38=Ltn1=Sb1=Bdv1] chromosome 7DS (leaf rust, yellow rust, stem rust, powdery mildew, leaf tip necrosis, spot blotch, barley yellow dwarf virus ) „ Lr46 [Syn.=Yr29=Sr58=Pm39=Ltn2=Ts?] chromosome 1BL „ Lr67 [Syn.=Yr46=Sr55=Pm46=Ltn3] chromosome 4DL „ Lr68 [yellow rust, powdery mildew and stem rust?] chromosome 7BL „ Yr54 [leaf rust, powdery mildew and stem rust?] chromosome 2DL Apav (susceptible) Lr67 Lr68 Lr46 Lr34 Avocet (susceptible) Formation of cell wall appositions (instead of hypersensitivity with NBS-LRR type race- specific genes)
- 7. Potential PAPR QTLsfor rusts 1BS, 2AL, 2BS, 2DL, 5AL, 5BL, 6AL and 7BL
- 8. CIMMYT PAPR research ► NormanBorlaug, 1950s ► Goes back to mid. 1970s and initiated by Sanjay Rajaram (breeder) and Jesse Dubin (pathologist) ► Late 1980s: Breeding strategy to develop high yielding varieties with near-immune resistance ► Early 2000s: Genetics and mapping of resistance genes
- 9. PAPR QTL analysisin Avocet/Sujata PVEs: QYL.cim-1AS explained 10.5-13.8% and 7.9-8.2% of stripe rust and leaf rust, respectively; QYL.cim-7BL explained 16.6-20.4% and 5.7-13.0% of for stripe rust and leaf rust, respectively Lr46/Yr29 and Lr67/Yr46 were also mapped in the population
- 10. PAPR QTL analysisin Avocet/Francolin#1 ► Additional QTL have been detected on 1BL (Lr46/ Yr29), 3BS (LR/Yr30) and 7DS (PVE:3.3-4.2 for LR) ► Flanking makers to Lr16 and YrF can be used in MAS based on testing in 350 lines from 45th IBWSN PVE: 17.8–27.9% PVE: 10.3–21.1% Lan et al. 2014 Molecular Breeding, DOI: 10.1007/s11032-014-0075-6
- 11. PAPR QTL analysisin Avocet/Quaiu #3 ► QYr.tam-2D, explained 49-64% of total phenotypic variation and was designated as Yr54 ► QYLr.tam-3D explained up to 6 and 7% of the phenotypic variance, respectively ► Known resistance genes Lr46/Yr29, Sr2/Yr30 and Lr42 Basnet et al. 2014 Molecular Breeding 33 (2):385-399
- 12. PAPR QTL analysisin Avocet/Kenya Kongoni LR: QLr.cim-1DS (Lr42, 6-21%), QLr.cim-2BL (20% in BV2011) and QLr.cim-3BS (5-10%) YR: QYr.cim-2BS (7-12%) and QYr.cim-5BL (6-8%) PVE: LR (12-57%) and YR (25-35%) PVE: LR (5-13% ) and YR (10%)
- 13. Fine mapping „ Single QTL/genemapping populations „ Minor QTL with fixed genetic background populations „ Deletion produced by γ-ray
- 14. Identification of deletionmutants for Lr67/ Yr46/Sr55/Pm46 ► Mutagenesis by gamma-irradiation using a 60 Co source at ININ, Mexico. ► 4000 seed radiated ► Grow M1, individually harvest plants ► Grow M2 (2000 lines, 20 space planted plants/M2), identify susceptible, harvest… ► M3, M4 plots ► 1 mutant was 15 bp deletion (M55), 1 mutant was 3bp deletion (M157) and 3 mutants were complete deletion of Lr67 (M87, M147, M168)
- 15. MAS in rustGenesMarkers Type Cultivar Reference PAPR genes Lr34/Yr18/Pm38/Sr57 Lr34SNP STS, SNP Parula Lagudah et al., 2009 Lr46/Yr29/Pm39/Sr58 csLv46 CAPS Pavon 76 Lagudah ES, pers comm Lr46/Yr29/Pm39/Sr58 csLV46G22 CAPS not in Parula Lagudah ES, pers comm Lr67/Yr46/Pm46/Sr55 Lr67SNP SNP RL6077 Lagudah ES, pers comm Lr68 CSGS, cs7BLNLRR CAPS Parula Herrera-Foessel et al. 2012 Sr2/Yr30 csSr2 CAPS Pavon76 Mago et al. 2011 Sr2/Yr30/Lr? gwm533 SSR Quaiu#3 Basnet et al. 2014 Yr54 Xgwm301 SSR Quaiu#3 Basnet et al. 2014 HTAP genes Yr36 Gpc-B1 Glupro, ND?? Uauy et al. 2006 Yr39 Xwgp36, Xwgp45, Xgwm18, Xgwm11 RGA, SSR Alpowa Lin and Chen, 2007 Yr52 Xbarc182, Xwgp5258 RGA, SSR PI 183527 Ren et al. 2012 Yr59 Xwgp5175, Xbac32, Xbac182 RGA, SSR PI 178759, PI 660061 Chen XM, pers comm Seedling genes Lr16 Xgwm210, Xwmc661 SSR Francolin#1 Lan et al. 2014 Lr19/Sr25 Psy1Da-g_SNP, PSY-E SNP, SSR Misr#1 Lr21 D14 Talbert et al. 1994 Lr42 cfd15, wmc432 SSR Quaiu#3 Basnet et al. 2014 Lr47 PS10R/ PS10L, PS10R/PS10L2 Helguera et al. 2000 Lr51 S30-13L/AGA7-759R Helguera et al. 2005 Yr17 VENTRIU/LN2, URIC/LN2 Milan Helguera et al. 2003 Yr24/26 CYD15, Xgwm11 Chuanmai 42 Zakari et al. 2003 Yr41 Xgwm410, Xgwm374 SSR Chuannong 19 Luo et al. 2008 Yr43 Xwgp110, Xwgp103, Xbarc139 RGA, SSR ID0377S Cheng and Chen 2010 Yr44 XpWB5/N1R1, Xwgp100, Xgwm501 RGA, SSR Zak Cheng and Chen 2010 Yr50 Xgwm540, Xbarc1096, Xwmc47, Xwmc310 SSR CH223 Liu et al. 2013 Yr60 Xwmc776,Xwmc313,Xwmc219 SSR Lal Bahadur Herrera-Foessel, pers comm
- 16. Breeding strategy ofwheat rusts Adapted cultivar X Sujata Adapted cultivarF1 X (Obregon) (Batan/Toluca) BC1 (400-500 plants per cross, MR)(Obregon) F2 (1000-1600 plants per cross, low to MR)(Batan/Toluca) Bulk selected F7 (30-40 lines, yield and quality tests) F3-F4 (400 plants per cross, grain characteristics ) F5-F6 (60-80 lines per coss, small plot, grain characteristics (Obregon,Bat an/Toluca) Bulk selected (Batan/Toluca) (Obregon) Pedigree Self-crossing MAS Phenotype and MAS Breeder for YT and EYT
- 17. Why do weuse PAPR in breeding? ► Leads to resistance durability- good for farmers and donors’ investment ► Genes have pleiotropic genetic control on rusts, powdery mildew and some other diseases ► Field based selection simultaneously with other traits increases high genetic gains for multiple traits
- 18. Utilization of PAPRgenes in breeding: challenges ► Small to intermediate effects of individual genes ► Dispersed presence of genes in different cultivars and germplasm ► Field selection environment lacking uniform and high disease pressure ► Need for growing larger population sizes for selection ► Difficulty in distinguishing small effect race-specific genes from slow rusting genes (especially for resistance to yellow rust) ► Higher G x E interaction on the expression and effectiveness of genes Despite numerous challenges, significant progress was made at CIMMYT for resistance to all three rusts
- 19. Cd. Obregón 39masl High yield (irrigated), Water-use efficiency, Heat tolerance, Leaf rust, Stem rust (not Ug99) Toluca 2640 masl Yellow rust Septoria tritici El Batán 2249 masl Leaf rust, Fusarium Njoro, Kenya 2185 masl Stem rust (Ug99 group) Yellow rust ► Targeted crosses for shuttle breeding made in 2006 and 1st group of populations planted in Kenya in 2008 ► 2000 F3/F4 populations undergo Mexico-Kenya shuttle ► High yielding, resistant lines derived from 1st group of Mexico-Kenya shuttle distributed worldwide in 2011 and 2012 ► Distribution of new materials to continue each year Njoro, Oct. 2008 Breeding for PAPR in CIMMYT Mexico (Cd. Obregon-Toluca/El Batan)- Kenya International Shuttle Breeding A five-year recurrent breeding cycle
- 20. Future plan ► New PAPRgene discovery in bi-parental and association mapping panels ► Fine mapping and cloning genes Lr68, Yr54, YrF, YrSuj, SrND643 and SrSHA7/SrHaril, and QTL on 1AS and 3DC ► Understanding the PAPR gene mechanism ► PAPR gene pyramiding and marker assistant selection in wheat breeding
- 21. China: Zhonghu He Xianchun Xia ZaifengLi Fangping Yang Garry Rosewarne Ennian Yang Jin Feng Yelun Zhang Acknowledgements Collaborators: Norway: Morten Lillemo South Africa Zakkie Pretorius Kenya: Sridhar Bhavani India: Arun Kumar Joshi Donors: DRRW Thank you Global Wheat Program (GWP)