Ripening-related changes in the cell walls of Spanish pear (Pyrus communis) [plasmodesmata]

almacenamiento cell structure cell walls cortex esclerenquima estructura celular etapas de desarrollo de la planta fruits frutas maduramiento pared celular parenchyma parenchyme parenquima paroi cellulaire pears pera plant developmental stages poire polyholoside polysaccharides pyrus communis ripening sclerenchyma solubilidad solubility stockage storage structure cellulaire ultraestructura ultrastructure