Abstract
The hybrid vigor typical of F1 cultivars is used to boost biomass production of sorghum (Sorghum bicolor (L.) Moench). The high dry-matter yielding F1 cultivar Kazetachi uniquely shows extremely late flowering and a long culm, and is greatly different from its parents. We investigated the genetic mechanisms underlying these phenotypes by quantitative trait locus (QTL) analysis of recombinant inbred lines derived from a male-fertile line and a restorer line and grown in 3 years. QTL analysis for six traits (days-to-heading, culm length, culm width, culm number, panicle length, panicle number) revealed that the unique phenotypes of the F1 plants were controlled by the genetic combination of 12 or more QTLs detected in at least 2 years. Two putative QTLs for days-to-heading (qDH1 on SBI-01 and qDH6 on SBI-06) would strongly affect the other phenotypes because of their co-localization with QTLs for other traits, as supported by significant phenotypic correlations. These QTLs would be useful for understanding the association of plant type with biomass production in sorghum.
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This work was supported by a grant from the Ministry of Agriculture, Forestry, and Fisheries of Japan (Rural Biomass Research Project, BCD-1223; Genomics for Agricultural Innovation, SOR-0006).
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Tomoyuki Takai and Jun-ichi Yonemaru contributed equally to this work.
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Takai, T., Yonemaru, Ji., Kaidai, H. et al. Quantitative trait locus analysis for days-to-heading and morphological traits in an RIL population derived from an extremely late flowering F1 hybrid of sorghum. Euphytica 187, 411–420 (2012). https://doi.org/10.1007/s10681-012-0727-8
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DOI: https://doi.org/10.1007/s10681-012-0727-8