A Molecular Switch Fine-Tunes Petal Size in Roses

A Molecular Switch Fine-Tunes Petal Size in Roses

Petal size is a defining trait of ornamental flowers, directly shaping visual appeal and commercial value. A new study uncovers how petal expansion in roses is precisely regulated through a feedback mechanism linking plant hormones and cell wall synthesis. The research shows that gibberellins promote petal growth by suppressing the transcription factor RhMYB70, which normally restricts cell expansion. This suppression activates cellulose biosynth