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Breeding for Rust Resistance in Kenya: Successes, Setbacks, and Future Approaches
Breeding for Rust Resistance in Kenya: Successes, Setbacks, and Future Approaches
Breeding for Rust Resistance in Kenya: Successes, Setbacks, and Future Approaches
Breeding for Rust Resistance in Kenya: Successes, Setbacks, and Future Approaches
Breeding for Rust Resistance in Kenya: Successes, Setbacks, and Future Approaches
Breeding for Rust Resistance in Kenya: Successes, Setbacks, and Future Approaches
Breeding for Rust Resistance in Kenya: Successes, Setbacks, and Future Approaches
Breeding for Rust Resistance in Kenya: Successes, Setbacks, and Future Approaches
Breeding for Rust Resistance in Kenya: Successes, Setbacks, and Future Approaches
Breeding for Rust Resistance in Kenya: Successes, Setbacks, and Future Approaches
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Breeding for Rust Resistance in Kenya: Successes, Setbacks, and Future Approaches

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P. Njau, R. Wanyera, S. Bhavani, L. Karani, M. Gethi

P. Njau, R. Wanyera, S. Bhavani, L. Karani, M. Gethi

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  • 1. Breeding  for  rust   resistance  in  Kenya:   Successes,  setbacks  and   future  approaches     P.Njau, R. Wanyera, S. Bhavani, L. Karani and M. Gethi njaupnn@yahoo.com
  • 2. •  “Ug99”  –  first   reported  in  Uganda   1998/9.   •  Muta9ng  and   migra9ng  (2012:  8   races  iden9fied  in   group,  present  in  11   countries)     •  Race  TTKSK  (original   “Ug99”  [red])  only   predominates  in   Ethiopia   •  Other  Ug99  race   group  races   predominate  e.g.,   Sr24  variants  in  Kenya   Ug99  a  challenging  race  to  beat  
  • 3. The  cri9cal  screening  facility  in  Njoro   1.  12  Hectares  of  land  available   for  screening   2.  Irriga9on  facility   3.  Greenhouse  underway   4.  Trained  personnel   5.  Room  for  expansion  available   • Over  300,000  accessions  have  been   evaluated  so  far   • Ability  to  evaluate  50,000  accessions   every  year   • Winter  wheat  are  vernalized  and   screened  in  the  field  
  • 4. Breeding  for  Resistance   New  mutants  of  the  Ug99  race  easily  overcome   the  deployed  genes  as  was  experienced  in  2007     Na9onal  Breeding  Programme  plays  an   important  role  in  incorpora9ng  the  resistant   gene  in  the  commercial  varie9es  
  • 5. Mexico (Cd. Obregon-Toluca/El Batan)- Kenya International Shuttle Breeding: a five-year breeding cycle) Cd. Obregón 39 masl High yield (irrigated), Water-use efficiency, Heat tolerance, Leaf rust, stem rust (not Ug99) Toluca 2640 masl Yellow rust Septoria tritici Fusarium Zero tillage El Batán 2249 masl Leaf rust, Fusarium Njoro, Kenya 2185 masl Stem rust (Ug99 group) Yellow rust ●  F1 and F1top/backcross developed at CIMMYT, and advanced to F2. ●  F3 and F4/F5 evaluated in Njoro. ●  Advanced F6 and initial observation in Mexico ●  Observation and selection in Njoro where lines with suitable adaptation are retained
  • 6. Varie9es  developed   Commercial  Name   Pedigree   Kenya Wren   THELIN # 2/TUKURU   Robin   BABAX/LR42//BABAX*2/3/TUKURU   Kenya Tai   ND643/2*WBLL1   Kenya Sunbird   ND643/2*WBLL1   Eagle10   EMB 16/CBRD//CBRD   Kenya Korongo   BABAX/LR42//BABAX*2/4/SNI/TRAP#1/3/KAUZ*2/TRAP// KAUZ   Kenya Kingbird   TAM200/TUI/6/PVN//CAR422/ANA/5/BOW/CROW//BUC/ PVN/3/YR/4/TRAP#1   Kenya Hawk12   URES/JUN//KAUZ/3/BABAX/4/TILHI  
  • 7. The  Seed  System  and  seed   produc9on  
  • 8. Our  focus   •  In  future,  breeding  for  rust  resistance  will  focus   on  combining  both  major  and  minor  genes  for   maximum  protec9on  and  durability.     •  The  use  of  molecular  markers  to  increase   efficiency  will  aid  selec9on  of  complex   resistances.     •  KARI  is  collabora9ng  with  CIMMYT  and  Na9onal   Ins9tute  of  Agricultural  Botany  (NIAB)  in  a  BBSRC   funded  project  to  improve  molecular  laboratory   facili9es  in  Kenya  so  as  to  implement  marker   assisted  breeding  strategies  
  • 9. Training  and  capacity  building   Training   course   organized   at   KARI   every   year   under   the   DRRW   project   are   designed   to   train   wheat  breeders  from  public  and  private  sector   in  Africa,  the  Middle  East  and  Central  and  South   Asia,   who   wish   to   learn   about   stem   rust,   evalua9on   of   germplasm,   and   standardiza9on   of  note  taking,  as  well  as  to  update  themselves   with   the   global   knowledge   and   innova9ve   techniques   that   can   enhance   progress   and   efficiency  in  their  breeding  ac9vi9es.  
  • 10. This work is funded by the BMGF through Cornel University under the DRRW project Need  to  play  a  regional  role   • Training   • Breeding/selec9on   • Breeder  seed  and  cer9fied  seed  produc9on   and  distribu9on   • Screening  of  regional  advanced  wheat  lines    

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