Ageing characteristics of wood of healthy and sandhill-declined Citrus sinensis

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Abstract
Cytological studies of starch, lipid, nuclei, dehydrogenases, and diaphorase activity in parenchyma of healthy and sandhill-declined trunk wood of Citrus sinensis 'Valencia' indicated that wood aged rapidly after a high metabolic activity near the cambium. Ethylene evolution and oxygen uptake were high in wood next to the cambium; ethylene was low in older wood and gas evolution was typical of older wood. Diseased wood contained less starch but more lipid than healthy wood. Lipid vessel plugs, caused by lipid leakage into vessels, and moisture content increased in wood as it aged. Characteristics of parenchyma cell ageing and wood color place it in the revised category of woods with a delayed, uncolored heartwood.

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