Association Mapping Identifies QTLs Underlying Cassava Brown Streak Disease Resistance Kayondo S.I , Dunia P.D.C., Ozimati A.A, Lozano R, Osingada F., Baguma Y., Vernon Gracen V.E, Offei S.K, Kawuki R.S., Jannink J.L The First World Congress on Root and Tuber Crops CBSD: A Thread to Africa Session Guangxi, Nanning China Jan 18 th – 24 th 2016
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ASSOCIATION MAPPING MINES QTLS UNDERLYING CASSAVA … · 2016-03-01 · Association Mapping Identifies QTLs Underlying Cassava Brown Streak Disease Resistance Kayondo S.I , Dunia
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Association Mapping Identifies QTLs Underlying Cassava Brown Streak Disease
Resistance
Kayondo S.I , Dunia P.D.C., Ozimati A.A, Lozano R,Osingada F., Baguma Y., Vernon Gracen V.E, Offei S.K,
Kawuki R.S., Jannink J.L
The First World Congress on Root and Tuber Crops
CBSD: A Thread to Africa Session
Guangxi, Nanning China
Jan 18th – 24th 2016
• Considerable genome diversity
within isolates of a species
CBSV>UCBSV
Cassava Brown Streak Disease….
• Two monopartite +ssRNA
viruses of genus Ipomovirus(Family Potyviridae)
• Two major strains reported
•Uganda cassava Brown
Streak Virus
•Cassava brown streak Virus
Winter et. al.
CBSD: A threat….
Herrera Campo et al., (2011) Food Security, 3:329-345
CBSD: Successful colonization….
• Re-emerges in the SSA region in 2001
• Resistance sources un-adapted & rare but could be explored.
• Reports of Quantitative (Multi-genic) inheritance of CBSD resistance
• Phenotyping protocol still challenging
Virus – Plant relations……Plant resistance
Forms
Virus
Resistance
Disease
Resistance
Experiences with Molecular markers in cassava
Breeding Material
QTL mappingFine Mapping
& Gene Discovery
Recurrent & Genomic selection
QTL detection in bi-parental
crosses
Only allelic variation present in the two parents captured