Tree growth stresses — Part V: Evidence of an origin in differentiation and lignification

SummaryAn important relationship has been shown between measurements of expansion of the radial dimension of cells during the lignification phase of differentiation, widely reported swelling of the thickness of cell walls during lignification, the fundamental mechanics of strain interactions in the three cardinal directions in materials generally, and a theory linking anisotropic behaviour of wood to its microfibril arrangement and the effect of encrusting substances in the cell wall. As a consequence, it has been deduced that tangential, longitudinal and radial stresses of substantial magnitude are generated in wood tissues as a result of lignification. In comparisons with measured growth stresses, it has been concluded that they are probably identical with the stresses that would develop as a result of lignification of the cell walls.

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