Ray Parenchyma Cell-Wall Ultrastructure and Formation in Pinus Banksiana

P. T. Mann


Ray parenchyma cells in seedlings of Pinus banksiana formed an unlignified multilayered primary cell wall during cell expansion. Some cells expanded radially four or five times the size of the ray initial. Evidence indicated that cell-wall extension occurred along the entire cell wall. After cell expansion, a secondary cell wall was rarely formed. Consequently, the ray crossing pits were considered to be blind pits.


wood anatomy;ontogeny;electron microscopy

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