Phuong, N. and Stutzel, H. and Uptmoor, R.
(2013)
Quantitative trait loci associated to agronomic traits
and yield components in a Sorghum bicolor L.
Moench RIL population cultivated under pre-flowering drought and well-watered conditions.
Agricultural Sciences, 4 (12).
pp. 781-791.
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Abstract
The present study aims to identify QTL influencing
agronomic traits and yield components
under well-watered and pre-flowering drought
stress conditions. One hundred F5 recombinant
inbred lines (RIL) and the parental lines of a
cross between a drought-tolerant and a susceptible
line in a field experiment were carried out at
Nong Lam University of Ho Chi Minh City, Vietnam.
Drought stress was induced by withholding
irrigation water from the plants at four weeks
after sowing to flowering. Leaf area of the third
leaf, stem diameter, plant height, days to heading,
anthesis and maturity, panicle length, number
of seeds per plant, hundred kernel weight
and grain yield were measured. Plants were genotyped
with 117 Diversity Arrays Technology
(DArT) and eight expressed sequence tag (EST)-
derived simple sequence repeat (SSR) markers.
Composite interval mapping was carried out on
the traits and significant QTL were claimed at a
logarithm of the odds (LOD) score >2.5. A total
of 50 QTL were detected on nine chromosomes
or 13 linkage groups, respectively. Six promising
QTL regions with seven QTL for yield and agronomic
traits especially related to pre-flowering
drought tolerance were identified on chromosomes
SBI-01, SBI-03, SBI-04, SBI-05 and SBI-
07
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