QTLs influencing panicle size detected in two reciprocal introgressive line (IL) populations in rice (Oryza sativa L.) |
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Authors: | H W Mei J L Xu Z K Li X Q Yu L B Guo Y P Wang C S Ying L J Luo |
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Institution: | (1) Shanghai Agrobiological Gene Center, 2901 Beidi Road, 201106 Shanghai, China;(2) Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, 12 South Zhongguancun St., 100081 Beijing, China;(3) China National Rice Research Institute, 359 Tiyuchang Road, 310006 Hangzhou, China;(4) Plant Breeding, Genetics and Biotechnology Division, International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines |
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Abstract: | Two sets of reciprocal introgression line (IL) populations, i.e., ILs with Lemont as recurrent parent (IL_LT) and ILs with
Teqing as recurrent parent (IL_TQ), were developed and evaluated for traits representing panicle size, including primary branch
number (PBN), secondary branch number (SBN), and spikelet number per panicle (SNP). Together with the regression to recurrent
parent by advanced backcross, transgressive segregations were observed for all traits. Correlation and regression analysis
showed that SBN had much higher contribution to SNP than PBN. It was confirmed by the QTL analysis that many common loci were
detected between SBN and SNP, in comparison with single common locus between PBN and SNP. One and three main effect QTLs (M-QTLs)
were detected for PBN in IL_LT and IL_TQ, respectively. Six M-QTLs per trait per populations were associated with SBN and
SNP. Less number and lower contribution of epistasis were detected in IL populations in comparison with mapping result from
F
2 or RI population. There were only four QTLs in fourteen loci (near 30%) commonly detected in both reciprocal IL populations
implying the large impact of genetic background on QTLs expression.
H. W. Mei and J. L. Xu contributed equally to this work. |
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Keywords: | Introgressive lines (ILs) Reciprocal populations Panicle architecture Quantitative trait locus Epistasis Oryza sativa L |
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