Quantitative trait loci for rice yield-related traits using recombinant inbred lines derived from two diverse cultivars |
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Authors: | XU FENG BAI LI JUN LUO WEN HAO YAN MALLIKARJUNA RAO KOVI YONG ZHONG XING |
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Institution: | (1) National key laboratory of crop genetic improvement and National Center of Plant gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China;(2) Shanghai Agrobiological Gene Center, 2901 Beidi Road, Shanghai, 201106, China;(3) College of Forestry, Northwest A&F University, Yangling, 712100, China |
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Abstract: | The thousand-grain weight and spikelets per panicle directly contribute to rice yield. Heading date and plant height also
greatly influence the yield. Dissection of genetic bases of yield-related traits would provide tools for yield improvement.
In this study, quantitative trait loci (QTL) mapping for spikelets per panicle, thousand-grain weight, heading date and plant
height was performed using recombinant inbred lines derived from a cross between two diverse cultivars, Nanyangzhan and Chuan7.
In total, 20 QTLs were identified for four traits. They were located to 11 chromosomes except on chromosome 4. Seven and five
QTLs were detected for thousand-grain weight and spikelets per panicle, respectively. Four QTLs were identified for both heading
date and plant height. About half the QTLs were commonly detected in both years, 2006 and 2007. Six QTLs are being reported
for the first time. Two QTL clusters were identified in regions flanked by RM22065 and RM5720 on chromosome 7 and by RM502
and RM264 on chromosome 8, respectively. The parent, Nanyangzhan with heavy thousand-grain weight, carried alleles with increased
effects on all seven thousand-grain weight QTL, which explained why there was no transgressive segregation for thousand-grain
weight in the population. In contrast, Chuan7 with more spikelets per panicle carried positive alleles at all five spikelets
per panicle QTL except qspp5. Further work on distinction between pleiotropic QTL and linked QTL is needed in two yield-related QTL clusters. |
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