Rice Restorer Line with Fragrance and Disease Resistance:Molecular Identification and Application
Improving the grain quality and blast resistance of rice restorer lines is the foundation for breeding new hybrid rice combinations with high yield,superior quality and disease resistance.By using molecular markers closely linked to the fragrance gene fgr and rice blast resistance genes Pi-1,Pi-9 and Pi-kh,the molecular marker-assisted selection of fragrance and blast resistance genes was performed in 265 F6 restore line generations derived from aromatic variety'Yuzhenxiang'crossed with disease resistant restorer lines'Fuhui 683'and'Jinhui 1131'.Six excellent restore lines carrying the aforementioned four target genes were selected.Combined with comprehensive character investigation,an aromatic restore line'Runxiang'with medium resistance to rice blast was bred.And a new combination of high-yield and superior-quality aromatic black hybrid rice'Ziliangyou Runxiang'had passed the approval of new crop varieties in Guangxi Province(Guishendao NO.2021200)and Fujian Province(Minshendao 20220024),which exhibited high yield,superior grain quality,and great potential for widespread cultivation.Molecular marker-assisted technology is a rapid and effective modern biotechnology breeding technique for the targeted improvement of rice aroma and blast resistance.
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