Freezing avoidance mechanisms by supercooling in some Rhododendron flower buds with reference to water relations

agronomic characters anatomia anatomie anatomy arbustos ornamentales biological control bourgeon breeding breeding aims buds chemicophysical properties cold composition contenido de humedad dicotiledoneas dicotyledons economic plants ericaceae ericales fleur flores flowers freezing frio froid inflorescence inflorescences inflorescencias lutte biologique moisture content objetivo de mejoramiento ornamental plants ornamental shrubs pest control methods plant anatomy plantas plantas ornamentales plante plante ornementale plants procesamiento processing propagation materials resistance to injurious factors resistencia a la temperatura rhododendron temperature resistance teneur en eau traitement yema (planta)