The significance of anomalous extractives in heart-shakes in Dacrydium species

Autor: W. E. Hillis, Josef Bauch, Y. Yazaki
Rok vydání: 1976
Předmět:
Zdroj: Wood Science and Technology. 10:79-95
ISSN: 1432-5225
0043-7719
DOI: 10.1007/bf00416784
Popis: Morphological and chemical examinations of the extractives of the tissues and shake contents of eight Dacrydium and one Podocarpus species have been made. The whitish deposits in heart-shakes are without exception mainly podocarpic acid (PCA). This compound occurs also in the tissue of samples but only when shakes are found nearby. Accordingly PCA is regarded as an anomalous extractive, synthesized in response to those conditions resulting in shake formation. In samples with shakes PCA is present in very small amounts at the sapwood-heartwood boundary and in one sample there were traces even in the innermost sapwood. It was notable that shakes containing deposits can arise in those Dacrydium species with coloured heartwood and with a known tendency for wetwood formation. On the other hand Dacrydium franklinii does not develop coloured heartwood or wetwood or shakes, and the lack of these features may have taxonomic significance.
Databáze: OpenAIRE
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