doi:

DOI: 10.3724/SP.J.1006.2016.01437

Acta Agronomica Sinica (作物学报) 2016/42:10 PP.1437-1447

Mapping of QTLs for Bacterial Blight Resistance and Screening of Resistant Materials Using MAGIC Populations of Rice


Abstract:
Three genetically interconnected multi-parents advanced generation inter-cross (MAGIC) population, including two populations (DC1 and DC2) derived from four parents and one population from eight parents (DC3) were used to detect QTLs for resistance to two strains, a weak virulent C2 and a strong virulent GD-V of Xanthomonas oryzae pv. oryzae (Xoo) and to screen resistant breeding materials. Most parents were resistant to C2 and susceptible to GD-V. Transgressive segregations of lesion length for the two strains were observed in the three MAGIC populations and showed continuous distributions. A total of seven QTLs affecting lesion length of two strains were detected. Most QTLs showed quantitative resistance and obvious genetic background effect. Among the seven QTLs, QBbr11-1 and QBbr11-2 had less genetic background effect, which is valuable in rice breeding for dis-ease resistance. Eight resistant lines pyramiding different QTLs were screened from the three MAGIC populations, indicating the combination of qualitative resistance gene and quantitative resistance gene can significantly improve resistance level. The eight resistant breeding lines could be used as resistant donors in rice breeding for resistance. The results indicated that the MAGIC populations are ideal material for genetic study and marker-assisted breeding, showing a tight integration of genetic research and breeding application in rice.

Key words:Multi-parent Advanced Generation Inter-Crosses (MAGIC),Rice bacterial blight,Quantitative trait loci (QTL),Genome-wide association study (GWAS),Rice

ReleaseDate:2017-01-12 13:30:41



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