Abstract:

Abstract： The antifungal effects on different position of Platycladus orientali heartwood and the sequent extractives of hexane and dichloromethane heartwood were carried out with whiterot fungi, brownrot fungi and aspergillus niger, respectively. The chemical components of the two kinds of heartwood extractives were also identified and analyzed by use of GC/MS. The antifungal tests showed that the heartwood powder from pith to sapwood according to the growth rings had notable antifungal effects on the three kinds of fungi mentioned above.Furthermore, the antifungal effect of the two\|part heartwoods nearby sapwood was better than that of the heartwood nearby the pith. 14 kinds of chemical components were identified from the heartwood extractives by GC/MS, most of which are terpenoids and their derivatives, and the content of thujopsene is the highest (25.564%), cedrol (19.743%) is second only to that of thujopsene. 24 kinds of chemical components were identified from the dichloromethane extractives, and the highest component is also thujopsene (15.429%). The antifungal growth diameter of the hexane heartwood extractives on the 14th days was respectively 10.0, 9.3 and 8.3 mm, which was larger than the dichloromethane ones for brownrot fungi, whiterot fungi and aspergillus niger. It is proved that hexane extractives have a good inhibition effect on the three fungi growth than dichloromethane extractives.

Key words: Key words： heartwood of Platycladus orientalis, chemical components, antifungal test, extractives, GC/MS