The Cell Wall Structure of Xylem Parenchyma

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Abstract
The fine structure of the cell wall of both ray and vertical parenchyma was investigated. In all spp. examined secondary thickening had occurred. In the primary cell wall the micellar orientation was approx. transverse to the longitudinal cell axis. Using optical and X-ray methods the secondary cell wall was shown to possess a helical micellar organization, the micelles being inclined between 30[degree] and 60[degree] to the longitudinal cell axis. The distr. of the various cell wall constituents was studied, and it was observed that most of the lignin occurred in the intercellular layer and primary wall. The layered structure of the cell wall of sclerosed parenchyma cells was also investigated and it was demonstrated that these cell walls are structurally and chemically heterogeneous.

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