Negative regulators of floral scent production by repressing the expression of C4H1 and C4H2, components of the floral volatile benzenoid/phenylpropanoid (FVBP) biosynthetic pathway. Mostly expressed in petal limbs, petal tubes, anthers and stigmas, and, to a lower extent, in stems. Barely detected in roots, sepals and leaves. In corollas, accumulates progressively during flower development, from buds to anthesis, with a peak at flower opening, but fades out in senescing flowers. Circadian-regulation with peak levels occurring at the end of the light period in flowers. Increased expression of C4H1 and C4H2 (PubMed:21068208). Higher levels of floral volatile benzenoid/phenylpropanoid (FVBP) compounds derived from p-coumaric acid (isoeugenol and eugenol) (PubMed:21068208).