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Cassava Breeding Community of Practice in Africa for Accelerated Production and Dissemination of Farmer-Preferred Cassava Varieties Resistant to Pests and Diseases. ARI. Cassava. Cassava is a strategic food security crop Important staple for millions in Africa

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Cassava Breeding Community of Practice in Africa for Accelerated Production and Dissemination of Farmer-Preferred Cassava Varieties Resistant to Pests and Diseases


  • Cassava is a strategic food security crop
  • Important staple for millions in Africa
  • Grown mainly by the poor resource famers
  • Nigeria, Ghana, Tanzania and Uganda are key producers in Africa
bottlenecks of cassava breeding
Low seed set

Long breeding cycle

High genetic load


Confounding effects of dominance on selection of progenitors

Limited financial resources

Bottlenecks of Cassava Breeding
  • There is an urgent need for improved varieties to stop the rapid spread of pest and diseases, especially the cassava brown streak disease (CBSD) and the cassava mosaic disease (CMD).
  • National Agricultural Research Systems (NARs) are best suited to breed cassava for local needs
  • NARs in the past limited their activities mainly to testing and selection of improved germplasm, but more recently NARs breeders have began formal cassava breeding.
the cop
The CoP
  • Ghana
  • Nigeria
  • Tanzania
  • Uganda
  • CIAT
  • IITA
  • More countries to be included in 2011

A group of people who share a concern or passion for something they do and how to do it better as they interact regularly.

  • They have a commitment to a common interest and engage in joint activities They therefore interact and learn together and in the process build a strong relationship.
  • It is a specialized compact network. It is intended as interactive forums for collaboration among scientists from different countries.
cassava mosiac disease

Cassava Brown Streak Disease

Cassava Mosiac disease

Leaves: chlorosis

– bottom leaves

Roots: dry necrotic rot – most damaging

Stems: brown streaks

  • Stimulate breeder-to-breeder training germplasmresource exchange, and web-based information to achieve breeding goals
  • Facilitate the integration of MAS with field-based breeding
  • Strengthen the capacity of National program breeders through training programs
  • Build linkages with primary, secondary, and tertiary users
priority initiatives
Priority Initiatives
  • Access to improved germplasm and development
  • MAS for CMD resistance
  • Improvement for combined resistance to CMD and CBSD
  • Gene discovery for CBSD and CMD
marker aided germplasm transfer from ciat to africa
Marker-aided germplasm transfer from CIAT to Africa
  • Over 300 CIAT MAS developed genotypes introduced to Africa
  • Back cross populations of PPD delivered to African NARs (with MAS for CMD)
  • Backcross populations of beta carotene and protein to NARs (with MAS for CMD)
  • F1 populations of drought tolerant materials (as in vitro and seeds)
novel traits introgressed from wild relatives
Novel traits introgressed from wild relatives

Based on ABC involving MAS for CMD resistance


TMS 97/2205 with good

CMD resistance across agro-ecologies

TMS97/2205 x NR 8083


MAS Scheme to Improve Cassava Germplasm

Local varieties

(selected by farmers)



Crossing block



Seedling trial

Field trials


ability studies

Farmer participatory trial

qtl mapping
QTL mapping
  • A total of10 putative QTL were identified for protein.
  • QTL found accounted for PVD ranges between 15% and 25% for protein content.
  • All the QTL showed additive gene action with values ranging between 3.21 and 6.20 (Fig. 15).


Esuma, 2011

development of populations
Development of populations
  • Crosses
    • F1 populations of elite genotypes
    • Introgression of introduced germplasm into local adapted varieties and landraces
    • Selfed populations – inbreeding (partial inbred lines).
Ugandan Breeder, Anthony Pariyo in Office at A.R.I, Naliendeli, Mtwara discussing the breeding schemes with the Tanzanian team

Breeder to breeder visit

Elizabeth Parkes in Nigeria; taking notes on field layout/design for crossing blocks

Tanzanian Breeder, BernadethaKimata discussing CBSD symptom expression in the field at NaCRRI, Namulonge, Uganda.

product delivery
Product delivery


  • Markers for CMD2 available in NARS
  • Advanced populations development
  • Capacity building in MAB (workshop/training)
  • Sharing of GCP project developed elite materials with stake holders (e.g. Songhai center, Benin Republic)
  • Channels
    • Farmer participatory breeding
    • Linked projects
    • Multi-locational testing with partner institutes
    • Networks



Web based data base for CoP


Molecular breeding community of practice to validate, refine, and

apply new technologies in African NARs


Workshops and Training

Third workshop in Ghana 2010

Participants at the third CoP workshop 2010 in Ghana.

Linking with New Genotyping Platforms and Marker system : Demonstration of the IlluminaBeadXpress at the SNP workshop


MAS Labs in NARS




new generation of cassava breeders
New generation of cassava breeders

Country - Uganda Nigeria Ghana GhanaGhana Tanzania

Name - Mr. Esuma Dr. Olasanmi Mr. Peprah Ms. Prempeh Mr. Danquah Ms. Kimata

Degree - M.Sc. Ph.D. M. Phil Ph.D. Ph.D. M.Sc.

Status On-going Completed On-going On-going On-going Ongoing

partial inbred line development
Partial Inbred line development

Genotyping of S1 populations- 2011

  • Five populations
  • Selection for reduced heterozygousity

Development of new selfed populations - 2011

  • S2 populations
  • S3 populations (two populations)
  • Research capability of NARs strengthened research capability in modern breeding incorporating markers in cassava improvement
  • CMD resistant variety released in Nigeria
  • Genotypes combining CBSD and CMD resistance developed in Tanzania
  • Web-database created
  • Genetic stock fixed for CMD2 and CGM alleles developed
  • Genetic diversity of breeding lines analyzed
  • Genetic mapping for early bulking and high protein conducted
  • Breeding populations for key traits developed
  • Introgression of novel traits into CMD resistance genetic background achieved.
  • Training of new generation of breeders accomplished
  • Introduction of valuable germplasm into Africa
  • Y. Baguma
  • A. Pariyo
  • B. Kimata
  • C. Sichalwe
  • C. Egesi
  • E. Parkes
  • B. Peprah
  • G. Mkamilo
  • J. Onyeka
  • M. Fregene
  • S. Rounsley
  • E. Lotsu
  • M.D. Quain
  • P. Rabinowicz
  • Z. Myburg
  • P. Kulakow
  • H. Murtah
  • X. Delannay
  • NdeyeNdackDiop
  • K. Ogundapo
  • F. Ewa
  • B. Olasanmi
  • E. Okogbenin
  • H. Gomez
  • C. de Vicente
  • M. Gedil
  • A. Dixon
  • H. Kulembeka
  • A. Mbanaso
  • R. Thompson
  • P. Boateng
  • O. Akinbo
  • M. Reynolds
  • A. Okono
  • N.C. Ezebuiro
  • Larry Butler