Abstract
In a rice variety ‘Gimbozu’ genome, transposition of miniature Ping (mPing) often causes the modification of gene expression and the disruption of gene function. IM294 is a slender-glume mutant line induced from Gimbozu by gamma-ray irradiation, and its mutant phenotype is caused by an insertion of mPing at the fourth exon of Rurm1 (rice ubiquitin related modifier-1) gene. Inserted mPing is excised from the Rurm1 gene and slender-glume mutant plant reverts to the original normal-glume plant. At the time of this reverse mutation, some of the revertants exhibited a vigorous growth. We named this revertant as a vigorously growing plant in IM294(VGI). Still we do not know any molecular clue regarding the mechanism of vigorous growth of VGI. In this study, we investigated nine agronomic traits including the grain shape and the grain number per panicle of a progeny plant of a VGI. QTL analysis was conducted to determine the chromosome region, which might be corresponding to the genetic factors modified by mPing insertion.
