Age-related variation in polyphenol content and expression of phenylpropanoid biosynthetic genes in a medicinal and aromatic perennial Agastache rugosa - Bielecka, M; Zielińska, S; Pencakowski, B; Stafiniak, M; Ślusarczyk, S; Prescha, A; Matkowski, A (Planta Medica, 2019)