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Paddy grain weight is important component determining rice grain yield, and this trait is controlled by quantitative trait loci (QTL).To study the genetic basis of 1 000-paddy grain weight, quantitative genetic analysis was conducted in a population of 37 introgression lines (ILs) of indica elite variety Habataki in the background of japonica cultivar Sasanishiki across two different environments (2011 Hainan and 2012 Nanchang).