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CBN-V Video Archives - S4-06
Genetic Analysis and QTL Mapping of Early Root Bulking in an F1
Population of Non-inbred Parents in Cassava (Manihot esculenta
Crantz)
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
The genetic basis underlying early bulking in cassava was studied in
a replicated, multi-locational trial using 144 F1 progeny derived
from an intra-specific cross between two non inbred parents. A
second sequential harvest experiment examined the relative
importance of eight yield-related traits on early bulking and their
QTLs during the crop growth cycle. Our objectives were to identify
traits (and genes controlling them) strongly associated with early
yield as a first step to marker-assisted improvement of the trait. A
total of 18 QTLs controlling early yield were identified in the
first experiment. Multiple linear regression analysis and stepwise
regression of early yield on eight yield-related traits revealed
harvest index, dry foliage weight and root diameter as the most
important factors associated with early yield. A total of 27 QTLs
were detected for these traits, 2 for dry foliage weight, 8 for
harvest index and 17 for root diameter. The individual effects of
the QTLs identified ranged from 7% to 33% of the phenotypic variance
explained. The identification of a number of QTLs with positive
effect for increased early yield provides an opportunity for
marker-assisted selection and improvement of early bulking potential
in cassava.
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Donald Danforth Plant Science Center All rights reserved.
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