Abstract
Near isogenic lines (NILs) can be used to efficiently handle a target quantitative trait locus (QTL) by blocking genetic background noise. One QTL, SPP1, which controls the number of spikelets per panicle (SPP), was located on chromosome 1, near Gn1a, a cloned gene for rice production in a recombinant inbred line population. NILs of the SPP1 regions were quickly obtained by self-crossing recombinant inbred line 30 which is heterozygous around SPP1. Using a random NIL-F2 population of 210 individuals, we mapped SPP1 to a 2.2-cM interval between RM1195 and RM490, which explained 51.1% of SPP variation. The difference in SPP between the two homozygotes was 44. F2-1456, one NIL-F2 plant, was heterozygous in the SPP1 region but was fixed in the region of Gn1a gene. This plant F3 family showed a very wide variation in SPP, which suggested that it was SPP1 but Gn1a affected the variation of SPP in this population. In a word, SPP1 is a novel gene distinct from Gn1a. Four newly developed InDel markers were used for high-resolution mapping of SPP1 with a large NIL-F2 population. Finally, it was narrowed down to a bacterial artificial chromosome clone spanning 107 kb; 17 open reading frames have been identified in the region. Of them, LOC_Os01g12160, which encodes an IAA synthetase, is the most interesting candidate gene.
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This work was supported by a grant from the National Key Program on Basic Research and Development of China, a grant from National Natural Science Foundation of China, and a grant for New Century Excellent Talents from the Education Ministry of China.
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Communicated by H. H. Geiger.
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Liu, T., Mao, D., Zhang, S. et al. Fine mapping SPP1, a QTL controlling the number of spikelets per panicle, to a BAC clone in rice (Oryza sativa). Theor Appl Genet 118, 1509–1517 (2009). https://doi.org/10.1007/s00122-009-0999-0
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DOI: https://doi.org/10.1007/s00122-009-0999-0