Genetic Analysis and Gene Mapping of a Twisted Hull Mutant in Rice

A twisted hull rice mutant was found in the progeny of a breeding population.Genetic analysis indicated that the mutant phenotype was controlled by a single recessive gene(temporarily designated as Osth).To map OsTH(t)gene,an F2 population was established by crossing the Osth mutant with R725,an indica rice variety with normal hulls.Finally,OsTH(t)was located between the SSR markers RM14128 and RM208 on the long arm of chromosome 2 at the genetic distances of 1.4 cM and 2.7 cM,respectively.These results provides the foundation for further fine mapping,cloning and functional analysis of OsTH(t)gene.