?-aminoisobutyric acid mimics the effect of 1-aminocyclopropane-1-carboxylic acid to promote sexual reproduction in the marine red alga Pyropia yezoensis (Rhodophyta)

1-aminocyclopropane-1-carboxylic acid (ACC), a precursor for ethylene, stimulates the switch from vegetative to sexual reproductive phase in marine red alga Pyropia species. This study explored effects of ethylene biosynthesis inhibitors on reproduction gametophytes yezoensis gain functional understanding role ACC as plant hormone algae. Here we show that two synthesis higher plants, 2-aminoethoxyvinyl glycine (AVG) and aminooxyacetic (AOA), had no effect growth gametogenesis P. yezoensis. In contrast, exogenous application ?-aminoisobutyric (AIB), structural analog blocks conversion induced formation spermatangia carpospores similar manner ACC, without endogenous accumulation. The treatment AIB failed inhibit production gametophytes. present results suggest mimics induce support our previous has regulation independent ethylene.