Le pneumatode chez Phoenix dactylifera. II. Ultrastructure de la paroi de la cellule aérifère chez des pneumatodes jeunes provenant de cultures axeniques

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Abstract
The pneumatode in Phoenix dactylifera is composed of air-filled cells with multilayered walls. Three main layers, L1, L2, and L3, have a pectic, polysaccharide, and proteic composition. When ageing, the last layer gives rise to wall outgrowths which are covered with a thin lamella (L4) essentially polysaccharidic in nature as are the wall and all material of intercellular spaces. Inwards, there appears a thin layered deposit (L0) that might correspond to beginning suberisation. The wall outgrowths are warts composed of juxtaposed vesicles. Every vesicle is constituted by a thin envelope and a matrix with a central globule inside. In the intercellular spaces, between young cells with still smooth walls, a fibrillar material is visible among a mosaïc of polysaccharidic and proteic matter. When vesicles appear, they release an homogenous-appearing material.