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Breed Sci. Jun 2012; 62(2): 151–159.
Published online Jun 19, 2012. doi:  10.1270/jsbbs.62.151
PMCID: PMC3405967
Mapping of QTLs underlying flowering time in sorghum [Sorghum bicolor (L.) Moench]
Yousra El Mannai, Tariq Shehzad, and Kazutoshi Okuno*
Laboratory of Plant Genetics and Breeding Science, Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan
*Corresponding author (e-mail: okusan/at/
Communicated by M. Yano
Received November 22, 2011; Accepted March 22, 2012.
Due to its critical importance in crop yield, the photoperiodic regulation of flowering time is considered an important trait in sorghum breeding programs. In this study, quantitative trait loci for flowering time were detected using an F2 population derived from a cross between Kikuchi Zairai, a late-flowering cultivar originating from Japan and SC112, an early-flowering cultivar originating from Ethiopia. F2 plants were grown with their parents under a natural day length and a 12 h day length. Two linkage maps were constructed using 213 simple sequence repeats markers. Nine quantitative trait loci controlling flowering time were identified in F2 plants grown under a natural day length, whereas 7 QTLs were identified under a 12 h day length. Five QTLs controlling flowering time were shared under both of the day length conditions.
Keywords: sorghum, flowering time, day length, quantitative trait loci, mapping
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