Effects of 1Dy12 subunit silencing on seed storage protein accumulation and flour-processing quality in a common wheat somatic variation line

•Expression of 1Dy12 in wheat mutant AS273 was decreased during grain development.•A stop codon caused by base change led to truncated translation of 1Dy12 in AS273.•The absence of 1Dy12 influenced the accumulation of seed storage proteins and GMPs.•The absence of 1Dy12 led to a larger size PBs and an inferior flour-processing quality.