Development and Evaluation of Yellow fleshed Cassava clones in Tanzania,Uganda and SARRNET Countries

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Farmers are more likely to accept yellow/orange fleshed cassava due to the growing popularity/acceptance of orange-fleshed sweet potatoes,Evaluation and selection of cassava varieties for high beta …

Farmers are more likely to accept yellow/orange fleshed cassava due to the growing popularity/acceptance of orange-fleshed sweet potatoes,Evaluation and selection of cassava varieties for high beta carotene content

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  • 1. Development and Evaluation of Yellowfleshed Cassava clones in Tanzania,Uganda and SARRNET Countries E. Kanju1 and P. Ntawuruhunga21IITA-Tanzania2IITA-Malawi International Institute of Tropical Agriculture – Institut international d’agriculture tropicale – www.iita.org
  • 2. Introduction•Thirty percent (30%) of African children under five areVitamin A deficient•Bio-fortification offers more cost-efficient treatment thanmedical supplements•Yellow-fleshed cassava are not commonly foundamong the local germplasm•Very few farmers are aware of yellow-fleshed cassavagenotypes•Farmers are more likely to accept yellow/orangefleshed cassava due to the growingpopularity/acceptance of orange-fleshed sweet potatoes International Institute of Tropical Agriculture – Institut international d’agriculture tropicale – www.iita.org
  • 3. Materials and Methods• Sources – Selections among F1 seedlings – TC materials from IITA-Ibadan (Uganda) – Crossing blocks established (Namulonge and Naliendele)• Selection criteria – Yellow fleshed colour – visual selection (1 – 9 scale) – High dry matter (≥30%) – Disease resistance/tolerance – Low CnP – Mealiness International Institute of Tropical Agriculture – Institut international d’agriculture tropicale – www.iita.org
  • 4. Achievements• Tanzania – All the clones selected (23 in CET 2006/07) were susceptible to CBSD – None of the clones selected was mealy – Colour score range 3 - 5 – Seeds from CBSD tolerant parents planted in 2009• Uganda – 44 clones at AYT at Namulonge in 2009 (high CMD and CBSD pressure) – Colour score range 3 - 5 – 21 clones introduced from Ibadan are at CET at Serere – Private partner interested and involved (UgaChick) International Institute of Tropical Agriculture – Institut international d’agriculture tropicale – www.iita.org
  • 5. 3 Evaluation and selection of cassava varieties for high beta carotene content • In Angola 18 yellow root clones from IITA introductions are in a clonal evaluation trial at Malanje and Kwanza Norte and will be harvested in November. • Additional clones with high beta carotene content are being selected from the 2007/08 SN. International Institute of Tropical Agriculture – Institut international d’agriculture tropicale – www.iita.org
  • 6. • In Malawi quantitative analysis for root beta carotene content started mid August (8 MAP).• Analysis is being conducted at IITA/SARRNET biochemistry lab.• Clone 98/2132 has the highest (7.15 ( g /g) levels of beta carotene followed by 01/1413, 01/16960, 01/1371 and 01/663 with levels of 3.03 to 4.69 g /g.• The checks (white-flesh), Mbundumali and NDL90/034, had the lowest levels (<0.05 g /g), confirming the fact that white-fleshed cassava are poor sources of beta carotene. International Institute of Tropical Agriculture – Institut international d’agriculture tropicale – www.iita.org
  • 7. • In Zambia the yellow root clones, 99/2987, 01/1224, 01/1380 and 01/1115, are still in the field at Mansa and will be evaluated for agronomic performance and root beta-carotene content at harvest in December.• In Mozambique, 82 clones (16 yellow root and 66 high protein content) are in AYT and UYT at Umbeluzi and Mocuba Research Stations. Will be analyzed for beta carotene and protein content at harvest in December. International Institute of Tropical Agriculture – Institut international d’agriculture tropicale – www.iita.org
  • 8. Way Forward• Develop source population for yellow-fleshed roots• Identify parents with high breeding values for deep yellow- fleshed roots, high dry matter content, low CnP and resistance to CMD and CBSD for use in crossing blocks• Start farmer participatory evaluation to capture farmers’ preferences• Quantify levels of beta carotene in selected clones (target is clones with 15μg/g)• Evaluate suitability of yellow-fleshed roots for use in different products• Germplasm introduction (esp. mealy deep yellow/orange parents) International Institute of Tropical Agriculture – Institut international d’agriculture tropicale – www.iita.org