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Owing to the recent advances in sequencing technology,genetic mapping of mutations has been revolutionized by whole-genome deep sequencing and bulk segregant analysis (Schneeberger et al.,2009;Abe et al.,2012).Once the mapping population for a mutant is available,genetic analysis can be simplified by using the pool of F2 plants with mutant phenotype and the pool of those showing wild-type phenotype.Since most mutant phenotypes are of qualitative character and follow simple inheritance pattes,genome-wide comparisons between the two DNA pools could localize the causal gene within a small genomic region.In most cases,the causative mutation (e.g.,an in-frame indel) can be detected as well because there are only a limited number of sequence differences between the mutant and its wild-type.Hence,rapid mutant mapping via genomics approaches is now becoming practical and cost-effective.