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CBN-V Video Archives - S4-07
QTL Mapping in an F1 Population from Non-inbred Parents in Cassava (Manihot
esculenta): Yield and Root Quality Traits
Okogbenin E.1,2 and Fregene M.1
1. International Center for Tropical Agriculture, AA6713, Cali,
Colombia m.fregene@cgiar.org
2. University of Ibadan, Ibadan, Nigeria
A F1 population intra-specific cross obtained from
non-inbred parents was evaluated in replicated multi-locational
trials for dry root yield (DRY), dry matter content (DMC), fresh
root yield (FRY), number of storage roots (NSR), and fresh shoot
weight (FSW) over a period of two years. Other traits evaluated were
harvest index (HI), leaf area index (LAI), starch content (STC),
starch yield (STY), amylose content (AML), culinary quality (CQ) and
post harvest deterioration (PHD). Molecular markers for QTL analysis
was from male- and female- derived linkage maps previously
constructed based on 135 and 143 markers respectively. Analysis of
variance indicates significant genetic variation in the F1
population for most of the traits. Many QTLs, between 4 and 11 QTLs
were identified for each trait with individual effects ranging
between 6% and 18%, a total of 81 QTLs were detected. Our results
revealed strong genotype x environment effect for a majority of the
QTLs (91%). The identification of QTLs controlling traits of
agronomic importance provides a powerful tool for understanding the
genetics of these traits of and can serve to guide breeding schemes
for their improvement.
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Donald Danforth Plant Science Center All rights reserved.
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