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Mapping Grain Weight QTL using Near Isogenic Lines from an Interspecific Cross  

Kang, Ju-Won (Department of Agronomy, Chungnam National University)
Yang, Paul (Department of Agronomy, Chungnam National University)
Yun, Yeo-Tae (Chungnam Agricultural Research and Extension Services)
Ahn, Sang-Nag (Department of Agronomy, Chungnam National University)
Publication Information
Korean Journal of Breeding Science / v.43, no.4, 2011 , pp. 304-310 More about this Journal
Abstract
In previous studies, we reported QTLs for grain weight (GW), qGW3 and for spikelets per panicle (SPP), qSPP3 linked to RM60 on chromosome 3 using advanced backcross lines derived from a cross between Oryza sativa ssp. Indica cv. Milyang 23 and O. glaberrima. The O. glaberrima alleles at this locus increased GW and spikelets per panicle in the Milyang 23 background. To further confirm and narrow down the position of the QTLs on chromosome 3, substitution mapping was performed using five lines containing the target O. glaberrima segment on chromosome 3. The size and position of the O. glaberrima segment on chromosome 3 were different in each line. These lines possessed 3-10 non-target O. glaberrima introgressions in the Milyang 23 background. These five lines were evaluated for seven agronomic traits including 1,000 grain weight and spikelets per panicle and also genotyped with seven SSR markers. Four lines were informative in delimiting the position of QTLs, qGW3 and qSPP3. Two lines with the O. glaberrima segment flanked by SSR markers, RM60 and RM523 displayed significantly higher values than Milyang 23 in GW and SPP whereas two lines without that O. glaberrima segment displayed no difference in GW and SPP compared to Milyang 23. The result indicates that two QTL, qGW3 and qSPP3 are located in the interval between RM60 and RM523 which are 1.2-Mb apart. Introgression lines having QTLs, qGW3 and qSPP3 would be useful materials not only to indentify the relationship between these two yield QTLs, but also to develop high yielding variety via marker-aided selection technology.
Keywords
Rice; Grain weight; Spikelets per panicle; QTL; Introgression lines; Interspecific cross;
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