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Rice(Oryza sativa)grain size and shape,which is quantitatively inherited and controlled by quantitative trait loci(QTLs),is one of the most important agronomic traits,having a strong effect on yield production and quality.In this study,we identified a novel QTL,Slender grain on chromosome 7(SLG7)that is responsible for grain size and shape,using backcross introgression lines derived from varieties 9311 and Azucena.