Plasma membrane H+-ATPase in the root apex: Evidence for strong expression in xylem parenchyma and asymmetric localization within cortical and epidermal cells

absorption de substances nutritives atpasa atpase capa pilifera cell membranes citoplasma coiffe cytoplasm cytoplasme epiderme epidermis floema membranas celulares membrane cellulaire nutrient uptake parenchyma parenchyme parenquima phloem plant vascular system plantule racine root cap roots seedlings sistema vascular de la planta zea mays