Abstract: Provided is loss-of-function granule bound starch synthase genes and a Fagopyrum plant using the same. Loss-of-function granule bound starch synthase genes have been produced by: identifying granule bound starch synthase genes highly expressed in endosperm of a Fagopyrum plant from among granule bound starch synthase genes identified from mapping results of a genomic sequence of the Fagopyrum plant; and allowing the granule bound starch synthase genes thus identified to lose a function by mutagenesis, and a Fagopyrum plant has been produced which is a double-recessive homozygote homozygously having the loss-of-function granule bound starch synthase genes.

Abstract: Provided is a loss-of-function transcription factor-like gene and a self-propagating Fagopyrum plant using the same. A self-propagating Fagopyrum plant having both long stamen and long pistil has been bred by: producing S-ELF3-PS1 gene which is a loss-of-function transcription factor-like gene by identifying a transcription factor-like gene formed by a linked gene group that controls lengths of stamen and pistil of a Fagopyrum plant from mapping results of a genomic sequence of the Fagopyrum plant, and allowing the transcription factor-like gene to lose a function by mutagenesis; and mating and cultivating an individual having this S-ELF3-PS1 self-propagation gene.