Abstract
SUMMARYThe nuclear shape, area, slenderness ratio, and disintegration are studied in two tropical angiosperm woods: Ougeinia oojeinensis and Garuga pinnata. In the ray cells the nucleus disappeared at the heartwood boundary. Nuclear disappearance is preceded by an appreciable loss of stainability and enlargement of the nucleus. During the disintegration the nuclear membrane ruptures at some points and the nuclear content gets released from the nucleus to get mixed up in the cellular contents and the extractives. In Garuga the presence of phenolic contents in the sapwood ray cells does not affect the nucleus. But, at the heartwood boundary they appear to enhance its degradation. Processes like starch deposition and degradation, accumulation of phenolic contents accompanied by changes in the shape and size of the nucleus suggest a very close relationship between these processes and the nuclear behaviour in the ray cells during the heartwood formation.
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