Two hundred and eighty one recombinant inbred lines derived from Xieqingzao B×R9308 were planted in Lingshui, Hainan (2006, 2007) and Fuyang, Zhejiang (2006) in ricegrowing season. QTLs for seven selected panicle traits were determined by composite interval mapping with Windows QTL Cartographer 2.5. Fiftytwo significant QTLs were detected in the three trials, including seven QTLs for plant length(PL), eight QTLs for primary rachis branch(PRB), nine QTLs for secondary rachis branch(SRB), six QTLs for grain density(GD), seven QTLs for total number of spikelets per panicle(TNSP), eleven QTLs for number of filled grains per panicle(NFGP), four QTLs for spikelet fertility(SF). For all the QTLs detected, phenotypic variance explained by a single QTL ranged from 23% to 312%. Most of QTLs for yield components displayed dominant additive effects, whereas epistatic effects were not significant. A total of eight common QTLs for four panicle traits were detected in all the three trials, including qPL1，qPL61, qTNSP1, qTNSP2, qTNSP3, qNFGP1，qNFGP32 and qNFGP62. These QTLs, particularly qNFGP32 and qTNSP3 with stronger additive effects and higher contribution rates would be further studied for finescale mapping and/or cloning. Some intervals with QTL cluster were determined in QTL mapping and most of the QTLs tended to have pleiotropism. In a specific interval with QTL cluster, the effect direction of QTLs controlling the correlative trait tended to be similar, implying the possibility of genetic improvement of multiple traits using DNA markers closely linked to these QTLs.
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