Marker-based analysis of genetic drag between blast-resistance and yield-trait genes in rice
2003
Zheng, K.G. | Zhuang, J.J. | Wu, J.L. | Chai, R.Y. | Cao, L.Y. | Leung, H. | Fan, Y.Y. | Jin, M.Z. | Rao, Z.M.
Based on major genes and QTL mapping for blast resistance and QTL mapping for yield traits in the same recombinant inbred line (RIL) population, genetic drag between the resistance-gene and yield-trait QTLs on chromosome 6 and between resistance QTLs and yield-trait QTLs on chromosome 7 was found. In our study, the QTLs for yield traits involved in the drag to the major resistance gene were finely mapped using two sets of RILs, each of which was composed of RILs carrying alleles on all the QTLs detected for yield-component traits on chromosomes 2, 3, and 7 from different parents based on the genotypes of the flanking DNA markers. The RILs within each set had different recombinations of alleles on marker loci. The control of genotypes on important loci for the traits studied in other parts of the genome increased the power to detect QTLs in the target region. More QTLs were detected for grain yield, spikelet fertility number of filled grains per panicle, total number of spikelets per panicle, and grain weight in the 35-cM region. Some QTLs were mapped within an interval of the target region.
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Эту запись предоставил International Rice Research Institute