Branches of 8-year-old trees of Acacia mangium Willd. from a plantation in Malaysia were wounded. After response periods from 1 to 4 weeks wound-adjacent xylem was investigated by electron microscopy. Wounding induced the synthesis of dark-stained material in parenchyma cells with subsequent secretion through the pits into vessels and fibres. After four weeks many of them contained wall-attached layers of this material. Entirely filled vessels and fibres were not observed. As a second wound-associated process suberization of parenchyma cells contributes to the separation of wound-adjacent xylem tissue. Fungal degradation frequently occurred around the wound already three weeks after wounding. The effectivity of early wound responses in A. mangium appears low
The periodicity of leaf change and flowering and fruiting of tropical trees is discussed. Cambial activity patterns in tropical trees are reviewed. Emphasis is put on research undertaken in South-East Asia on the most important timber tree family in that region, the Dipterocarpaceae. There is an urgent need for more information on the effects of rainfall patterns and phenological periodicity on cambial activity and ring formation in this family
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