Accelerated dehardening in bilberry (Vaccinium myrtillus L.) induced by a small elevation in air temperature

air temperature arbre forestier azucares bourgeon buds changement climatique climatic change fenologia forest products forest trees frost gel global warming glutathion glutathione glutation helada minor forest products non-wood forest products phenology picea productos forestales produit forestier resistencia a la temperatura resistencia invernal sucres sugars temperatura del aire temperature resistance vaccinium myrtillus winter hardiness yema (planta)